LG Flat TV 32LG40 Manual de Entrenamiento

42LG60

LG TRAINING MANUALFall 2008 LCD Training

LG TRAINING MANUAL

32LG40

IMPORTANT SAFETY NOTICEThis manual was prepared for use only by properly trained audio-visual service technicians. When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics. Unauthorized modifications will not only void the warranty, but may lead to property damage or user injury. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring, and lead dress must conform to original layout upon completion of repairs. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it only with the factory specified fuse type and rating. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the resistor 10mm away from PCB. Always keep wires away from high voltage or high temperature parts. Do not attempt to modify this product in any way. Special components are also used to prevent shock and fire hazard and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics. Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines. Circuit diagrams may occasionally differ from the actual circuit used. This way, implementation of the latest safety and performance improvement changes into the set is not delayed until the new service literature is printed.

ElECTROSTATICAllY SENSITIvE DEvICESSome semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on the body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as an ESD mat, to prevent electrostatic charge buildup or exposure of the assembly. Use only a grounded-tip soldering iron to solder or unsolder ES devices. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ES devices. Do not use refrigerant-propelled chemicals which can generate electrical charge sufficient to damage ES devices. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it.

REGUlATORY INFORMATIONThis equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna; Increase the separation between the equipment and receiver; Connect the equipment into an outlet on a circuit different from that to which the receiver is connected; Consult the dealer or an experienced radio/TV technician for help. The responsible party for this devices compliance is: LG Electronics of Alabama, Inc. 201 James Record Road. Huntsville, AL 35813, USA. Digital TV Hotline: 1-800-243-0000

Published July 2008 by LG Electronics USA Training Center

Copyright 2008 LG Electronics of Alabama, Inc.

Contact Number Hours of Operation

Customer Service (800) 243-0000 24 hours a day / 7 days a week

Technical Support (800) 847-7597 7am-7pm Mon-Fri / Sat 8-2 CT

Parts Sales (888) 393-6484 7am-7pm Mon-Sat CT

Training Center (256) 774-4051 8am-5pm Mon-Fri CT

Web ContaCts:Web Site Address Description

LG USA www.lgusa.com Product information

Customer Service us.lgservice.com User manuals, FAQs

GCSC aic.lgservice.com Service manuals, parts, bulletins

Customer Service Academy www.lgcsacademy.com Web training, discussion forum

Live Training lge.webex.com Live training

Phone ContaCts:

Fall 2008 LCD Training 3

Table of ConTenTs

Overview .................................................. 5introduction ....................................................5Basic Troubleshooting Steps ............................5Caution............................................................5Model Number Structure ...............................6Serial number Structure ..................................6Features ..........................................................732LG40 Dimensions ........................................842LG60 Dimensions ........................................8remote Control ..............................................9New Features .................................................9Computer Connection ................................. 10Service Menu ................................................ 10Power Consumption .................................... 10Service remote ............................................ 11Check Firmware version ............................. 12Update Firmware ......................................... 12

DiSaSSeMBLy - 32LG40 ............................ 13Back Cover removal .................................... 13Board Layout ................................................ 13Power Supply removal ................................ 14Main Board removal .................................... 14LCD Driver removal ................................... 15Ballast removal ............................................ 16DvD Player removal ................................... 17DvD Player removal ................................... 17exploded view ............................................. 18

CirCUiT DeSCriPTiONS - 32LG40 ......... 19Power Supply (SMPS) ................................... 19Main (Digital) Board ..................................... 22Ballast assembly ........................................... 30LCD Driver (T-Con) .................................... 32DvD Player .................................................. 34Front Board .................................................. 35invisible Speaker System ............................. 37

DiSaSSeMBLy - 42LG60 ............................ 39introduction ................................................. 39back cover removal ..................................... 39Power Supply (SMPS) removal .................... 40Main Board removal .................................... 40control Board removal ................................ 41LCD Driver Board removal ......................... 41Speaker Box removal .................................. 42exploded view ............................................. 43

CirCUiT DeSCriPTiONS - 42LG60 ......... 45introduction ................................................. 45Backlight Layout ........................................... 46Power Supply Layout ................................... 47Control Board Layout .................................. 49LCD Driver (T-CON) Layout ...................... 51Main board layout ........................................ 53invisible Speaker SyStem Layout .................. 61

SCheMaTiCS ............................................ 6332LG40 :: interconnect ................................ 6332LG40 :: waveForms ................................. 6432LG40 :: Main Board :: Main Micro ............ 6532LG40 :: Main Board :: audio .................... 6632LG40 :: Main Board :: Memory ................ 6732LG40 :: Main Board :: BCM/USB .............. 6832LG40 :: Main Board :: DCM ..................... 6932LG40 :: Main Board :: LvDS/DvD ............ 7032LG40 :: Main Board :: Tuner Power ......... 7132LG40 :: Main Board :: Jackpacks ............... 7232LG40 :: Main Board :: hDMi .................... 7342LG60 :: interconnect ................................ 7442LG60 :: waveforms .................................. 7542LG60 :: Main Board :: BCM ..................... 7642LG60 :: Main Board :: DDr Memory ...... 7742LG60 :: Main Board :: Main Micro ........... 7842LG60 :: Main Board :: audio Processor .. 7942LG60 :: Main Board :: hDMi ................... 8042LG60 :: Main Board :: interface ............... 8142LG60 :: Main Board :: interface ............... 8242LG60 :: Main Board :: regulators ............ 8342LG60 :: Main Board :: LvDS/Tuner .......... 8442LG60 :: Main Board :: audio Out ............ 85

- 4 -Fall 2008 LCD Training 5

OveRvIeW

OveRvIeW 2008 LCDSINTRODUCTION

The manual covers two models from the 2008 LCD product line. Each model is an HDTV with integrated HD tuner. The 32LG40 is a 720p/1080i model, the 42LG60 supports 1080p (Full HD). All models 32 and larger include USB Media Host and SimpLink. USB Media Host consists of a USB port on the back of the TV that supports USB flash memory drives loaded with media or firmware for the TV. SimpLink allows for control of other LG SimpLink products via the HDMI connection.

All LCD TV models are module level repair in and out of warranty. They are covered by a one year parts and labor warranty. Refer to the last page of the owners manual for more warranty information. For models under 30, the Sevice Level is Factory Service Repair. Larger models are Field Service. Contact the Warranty department for more information.

BASIC TROUBLeSHOOTING STePSDefine - Look at the symptom carefully and determine what circuits could be causing the

failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for relay closing etc. Observation of the front Power LED may give some clues.

Localize - After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.

Isolate - To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes glitches or road bumps will be an indication of an imminent failure.

Correct - The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.

CAUTION1) A 20 minute pre-run time is required before any adjustments are performed. 2) Refer to the Voltage Sticker on the Switch Mode Power Supply silk screening. (+/- 1/2

volt).

6 Fall 2008 LCD Training

OveRvIeW

MODeL NUMBeR STRUCTURe

4 2 L G 6 0 - U A

Screen Size

YearG = 2008 Series/Feature Level

30/31 = HDTV40 = DVD Player50 = Full HD60 = Scarlet - Full HD & 120Hz70 = Full HD & 120Hz90 = LED BacklightX = Super Thin

Display TypeP = PlasmaL = LCDD = DLP RPTVJ = Projector

BrandZ= ZenithBlank = LG

RegionU = North AmericaB = Europe & NA

Chassis Version

SeRIAL NUMBeR STRUCTURe

4 0 3 M X X Q 0 5 1 0 6

Sequential Number (5-7 Numbers)

Production Info (2 Letters)

Production Site (2 Letters)

Production Year and Month (3 Numbers). Ex, March 2004.

3) Be cautious of electric shock from the Backlight section, it uses high voltage AC. Check that the Power Supply and Drive Circuits are completely discharged because of residual current stored before circuit board removal.

4) C-MOS circuits are sensitive to static electricity. Use caution when dealing with these IC and circuits.

5) Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.

6) Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.

7) Check the appearance of the Replacement Panel and Circuit boards for both physical damage and part number accuracy. Verify model names and board model matches.


OveRvIeWFeATUReS

Model Name 32LG40 47LG60Chassis Name LP81A LP81A

Screen Specs

Resolution 1366 x 768p 1920 x 1080pBrightness (cd/m2) 500 500Contrast Ratio (Bare Module) 1,200:1 1,500:1

Dynamic Contrast Ratio 10,000:1 12,000:1Viewing Angle 178/178 178/178Colors Reproduction (R,G,B) 8 Bit

10 Bit (8 Bit+Dithering)

Response Time (GTG) 8ms 5m/sUSB Port

USB Flash Drive Support Yes YesMP3/JPEG No YesVideo No Dvix Only

HDMI Support

HDMI 1.3 with Deep Color Yes YesSimplink (HDMI CEC) Yes Yes

Cabinet

Front Cabinet Style Glossy Black Glossy BlackRear Cabinet Style Matte Black & Red Glossy RedSpeaker Invisible Speaker Invisible SpeakerRoHS Yes YesVESA Compatible 200 x 200 200 x 200Wall Mount Model RW-230 AW-47LG30F

Power Specs

Voltage, Hz 100-240Vac 50/60Hz 100-240Vac 50/60HzConsumption (Max) 150W 310WConsumption (Typical) 130W 290WStand-by 1W 1W

42LG6032LG40


OveRvIeW32LG40 DIMeNSIONS

7.9"200mm

21.7"551.2mm

3.9"100mm

3.5"89mm

11"279mm

31.8"808mm

9 11/16"246.06mm

8.38"212.74mm

Remove 4 screws to remove stand for wall mount

Model No.Serial No.Side Label

12"304.8mm

17.1"434.34mm

24.8"629.92mm

4.3"109mm

11.8"299.7mm

Not Center

Center

3.9"100mm

42LG60 DIMeNSIONS 42LG60 Dimensions

7.9"200mm

29.4"746.76mm 14.7"

373.38mm

40.9"1038.86mm

Remove 4 screws to remove stand for

wall mount

Model No.Serial No.

Label

15.8"402mm

20.5"520.7mm

31.3"795mm

2.4"60.96mm

14.9"376.46mm

Center

3.9"100mm

6.6"168.78mm

8"204.4mm

11.85"301mm

1.94"49.2mm


OveRvIeWReMOTe CONTROL

2008 models feature a newly designed, easier to use remote. The remote has fewer buttons than previous designs which was accomplished by moving many functions to an on-screen Quick Menu. The Q. MENU button on the remote opens the Quick Menu and the user can choose between options like aspect ratio, closed captions, sleep timer, etc. The remotes are programmable for other devices. These LCDs also support SimpLink devices. When using SimpLink, the device buttons on the remote do not need to be pressed to switch modes before controlling external equipment. External devices are controlled by the TV instead of the remote.

NeW FeATUReSBelow are some of the new features on some 2008 LCD TVs.Intelligent sensor - LGs Intelligent Sensor uses 4,096 sensing steps

to evaluate its surroundings. Using a sophisticated algorithm, the LG processes picture quality elements including brightness, contrast, color, sharpness and white balance. The result is a picture optimized for its surroundings, more pleasing to watch. It can also save up to 50% in power consumption since the screen will brighten and dim to match ambient lighting.

TruMotion 120Hz - Advance 120Hz panel provides clear, smooth images, even during fast action scenes creating a stable structure for a crisper picture.

24p Real Cinema - Hi-def movies run at exactly 24 frames per second speed that they were originally filmed in, making the home-cinema experience one step closer to a Real Cinema experience.

Full HD 1080p Resolution - Displays HDTV programs in full 1920 x 1080p resolution for a more detailed picture. Standard HD LCDs are 1366 x 768.

Clear Voice Technology - Isolates the dialog (human voice range) by boosting the mid-range tones from 300hz to 3500hz.

Expert Menu - Expert Menu features Imaging Science Foundation Certified Calibration Controls which allow precise in-home picture calibrations.

INPUT

FAV

MUTE

TV

STB

POWER

Q. MENU MENU

AV MODERETURN

ENTER

VOL CH

1 2 3

4 5 6

7 8

0

9

FLASHBK

PAGE

DVD

VCR


OveRvIeWCOMPUTeR CONNeCTION

A computer can be connected to the RGB (VGA) or HDMI connection on the TV. The HDMI connection will require a DVI to HDMI adapter if the PC has a DVI connector. Set the monitor output resolution and vertical frequency on the PC before connecting it to the TV. Refer to the owners manual for a full list of suported resolutions. The message OUT OF RANGE will appear on the screen if the resoultion is not supported.

SeRvICe MeNUThe service menus can be used to make adjustments, change color alignment, and get software versions. There are two service menus. The Adjust and Instart menu can be accessed using the service remote (Service remotes are available from LG parts). They can also be accesed by holding down the menu button on the TV and the remote until the user menu disappears. The menus alternate between Adjust and Instart every time the menu button is held down. If the TV asks for a password, enter 0000 (four zeros).

ModelOn Stand-By

TYP MAX UNIT TYP MAX UNIT

19LS4D-UA 42W 0.85 1W20LS7D-NB 56W 0.85 1W20LS7D-UK 56W 0.85 1W22LC2D-UB 46W 0.85 1W22LS4D-UA 46W 0.85 1W23LS7D-NB 78W 0.85 1W23LS7D-UK 78W 0.85 1W26LC7DC-UB 110 160W 0.7 1W26LC7DC-UK 30 160W 0.7 1W26LC7D-UK 30 160W 0.7 1W26LG30DC-UA 99 115W 0.36 0.8W32LC4D-UA 150 190W 0.7 1W32LC50C-UA 190W 3W32LC5DC-UA 190W 3W32LC7DC-UK 170 190W 0.7 1W32LC7D-UB 150 190W 0.7 1W32LC7D-UK 170 190W 0.7 1W32LG30DC-UA 149 171W 0.36 0.8W32LX50C-UA 190W 3W32LX5DC-UA 190W 3W37LC50C-UA 210W 3W37LC5DC-UA 210W 3W37LC7DC-UK 190 220W 0.8 1W37LC7D-UB 180 220W 0.8 1W37LC7D-UK 190 220W 0.8 1W37LG30DC-UA 167 191W 0.36 0.8W42LB50C-UA 240W 3W42LB5DC-UA 240W 3W42LC4D-UA 230 240W 0.8 1W42LC50C-UA 240W 3W42LC5DC-UA 240W 3W42LC7DC-UK 220 240W 0.8 1W42LC7D-UB 230 240W 0.8 1W42LC7D-UK 220 240W 0.8 1W42LG30DC-UA 226 244W 0.36 0.8W

POWeR CONSUMPTION

Resolution Vertical Frequency (Hz)30/40/50/60/70 series

1280x768 60Hz1360x768 60Hz1366x768 60Hz

50/60/70 series1600x1200 60Hz1920x1080 60Hz


OveRvIeWSeRvICe ReMOTe

NUM KEY FUNCTION

1 POWER To turn the TV on or off

2 POWER ON To turn the TV on automatically if the power is supplied to the TV. Use the POWER key to deactivate; It should be deactivated when delivered.

3 MUTE To activate the mute function.

4 P-CHECK To check TV screen image easily.

5 S-CHECK To check TV screen sound easily

6 ARC To select size of the main screen (Normal, Spectacle, Wide or Zoom)

7 CAPTION Switch to closed caption broadcasting

8 TXT To toggle on/off the teletext mode

9 TV/AV To select an external input for the TV screen

10 TURBO SOUND To start turbo sound

11 TURBO PICTURE To start turbo picture

12 IN-START To enter adjustment mode when manufacturing the TV sets.

To adjust the screen voltage (automatic): In-start mute Adjust AV (Enter into W/B adjustment mode).

W/B adjustment (automatic): After adjusting the screen W/B adjustment Exit two times

13 ADJ To enter into the adjustment mode. To adjust horizontal line and sub-brightness.

14 MPX To select the multiple sound mode (Mono, Stereo or Foreign language).

15 EXIT To release the adjustment mode.

16 APC(PSM) To easily adjust the screen according to surrounding brightness.

17 ASC(SSM) To easily adjust sound according to the program type.

18 MULTIMIDIA To check component input.

19 FRONT-AV To check the front AV.

20 CH To move channel up/down or to select a function displayed on the screen.

21 VOL To adjust the volume or accurately control a specific function.

22 ENTER To set a specific function or complete setting.

23 PIP CH-(OP1) To move the channel down in the PIP screen. To use as a red key in the teletext mode.

24 PIP CH+(OP2) To move the channel in the PIP screen. To use as a green key in the teletext mode.

25 PIP SWAP(OP3) To switch between the main and sub screens. To use as a yellow key in the teletext mode.

26 PIP INPUT(OP4) To select the input status in the PIP screen. To use as a blue key in the teletext mode.

27 EYE To set a function that will automatically adjust screen status to match. The surrounding brightness so natural color can be displayed.

28 MENU To select the functions such as video, voice, function or channel.

29 IN-STOP To set the delivery condition status after manufacturing the TV set.

30 STILL To halt the main screen in the normal mode, or the sub screen at the PIP screen. Used as a hold key in the teletext mode. Page updating is stopped.

31 TIME Displays the teletext time in the normal mode. Enables to select the sub code in the teletext mode.

32 SIZE Used as the size key in the PIP screen in the normal mode. Used as the size key in the teletext mode.

33 MULTI PIP Used as the index key in the teletext mode. Top index will be displayed if it is the top text.

34 POSITION To select the position of the PIP screen in the normal mode. Used as the update key in the teletext mode (Text will be displayed if the current page is updated.)

35 MODE Used as Mode in the teletext mode.

36 PIP To select the simultaneous screen.

37 TILT To adjust screen tilt.

38 0~9 To manually select the channel.


OveRvIeWCHeCk FIRMWARe veRSION

You can check the firmware version by opening the service menu. It is located near the top of the menu.

UPDATe FIRMWARe1) Copy the firmware to the top

level on a USB flash drive and to a folder named LG_DTV. Some models require the LG_DTV folder, and some dont. Put it in both locations if you are not sure which is correct. Only copy the file (or files) for the model you are currently updating. 2) Turn on the TV and insert the USB drive to the USB IN port.

3) If the firmware is newer than what is already installed, the upgrade menu should open automatically. If the update menu doesnt open, press MENU on the user remote and select OPTION. Now press the Fav key 7 times and the upgrade menu will open.

4) Select START and press ENTER on the remote to start the software upgrade.5) The TV will copy the update from the drive and then install it. Do not turn the TV off

until it is finished.6) The TV will automatically turn off and back on after the upgrade is successfully

finished.7) Check the firmware version to verify the update was succesful.

Model Name Bar Code (Code 128, Contains the manufacture No.) Manufacture No. The trade name of LG Electronics Manufactured date (Year & Month) The place Origin Model Sux

LP81A LPL L42FHDMain V1.62 USB V2.1400 HDCP 0UTT 97

Tool Option1 39848Tool Option2 51Area Option 1OPTION1 43OPTION2 46OPTION3 0OPTION4 0System ControlAudio PrescaleThresholdPower Off HistoryPanel ControlDavinci / Auto Test

LP81A LPL L42FHDMain V1.62 USB V2.1400 HDCP 0UTT 97

Tool Option1 39848Tool Option2 51Area Option 1OPTION1 43OPTION2 46OPTION3 0OPTION4 0System ControlAudio PrescaleThresholdPower Off HistoryPanel ControlDavinci / Auto Test


32LG40


DISASSeMBLy

DISASSeMBLy 32LG40BACk COveR ReMOvAL

Remove the 18 screws shown. Pay attention to the size and type of screw as there are many different types. Putting in the improper screw when reassembling may cause damage. The stand does not need to be removed.

LCD Driver (T-CON)

Power Supply

SideInputs

Main (Digital) BoardBallast

Front Keypad

DVD Player

Keypad

BOARD LAyOUT


32LG40


DISASSeMBLy

POWeR SUPPLy ReMOvALDisconnect P203, P201, and AC In. Now remove the 4 screws indicated.

MAIN BOARD ReMOvALRemove the Right side decorative plastic piece by removing the top and bottom screws. Remove the remaining 6 screws and remove the shield covering the Main board. Careful at this point, the board will swing free of the supports. Disconnect P902, P800, P901, P900, P904, P401, and P500. Note: In the top right is connector P200. This is an open connection for software upgrades. Remove the 2 screws securing the Side input decorative plastic piece on the right. Finally, remove the 4 screws securing the Main board as indicated.


32LG40


DISASSeMBLy

CN1 LVDS

Remove Screw

Remove Screw

Remove Screws and Remove Brace

Remove Screw

LCD DRIveR ReMOvALRemove the screws and then the brace.

Carefully remove the LVDS cable and then the board. If just removing the shield and not the board, re-install the 3 screws that held the shield on to establish ground.

Remove LVDS Cable


32LG40


DISASSeMBLyBALLAST ReMOvAL

Remove the shield and then the ballast. Be sure all heat sinks and insulators are in place when re-assembling.

Protects the Outputs

Insulator

InsulatorShiny Side

Down(Conductive)

Cut Out

AlignmentNotch

Alignment Notch

Heat Transfer MaterialShield


32LG40


DISASSeMBLy

DvD PLAyeR ReMOvALDisconnect CN400, CN401, and CN402. Now the DVD Player can be removed.

CN400

CN401

CN4002

This screw hidden by tape in previous photo (Step2).

DvD PLAyeR ReMOvALRemove the tape and then remove the 8 screws holding the DVD Player in place.

RemoveTape

RemoveTape

CN402

CN400

CN401


32LG40


DISASSeMBLy

Loc Part # Description Specification120 EAB41418001 Speaker,Woofer EN21C-6742(55) FERRIT 10W 8OHM 78DB 140HZ 55X37 121 EAB41284402 Speaker,Tweeter D025D12K1401(10/90) 33uF/50V 20W 4OHM 68DB 590HZ122 ABA36844404 Bracket Assembly SPEAKER 32LG40 LA89A SPK BRKT ASSY LEFT, CKD OF 123 ABA36844403 Bracket Assembly SPEAKER 32LG40 LA89A SPK BRKT ASSY RIGHT , CKD O200 EAJ41825601 LCD,Module-TFT LC320WXN-SAA1 WXGA 32.0INCH 1366X768 500CD - 72%300 ABJ36840802 Cabinet Assembly 32LG40 LA89A 32 DVDP, CKD OF 01 , US400 ACQ36842402 Cover Assembly,Rear 32LG40 LA89A 32 DVDP, CKD 01 , US500 EBR44342401 PCB Assembly,Front 32LG40 LED & P/SW T.T LA89A LG40 32 Breathing[Re510 EBR43501201 PCB Assembly,Sub SUB T.T LA89A 32LG40-UA AUSQLHX 32LG40-UA Sub Co521 ABA35569917 Bracket Assembly BRACKET 32LG40 LA89A DVDP SIDE AV BRACKET ASSY, 530 EAY40504401 SMPS,AC/DC 08H 3237 90VTO264V 180W 50~60Hz UL/CSA/SEMKO Yuy531 MGJ42154602 Plate,Metal PRESS SBHG 0.5T SHIELD SPTE METAL POWER board 3540 EBU43499001 Main Total Assembly 32LG40-UA BRAND LA89A550 EBT50140201 Chassis Assembly POWER(SMPS) LA89A AC INLET Assy for 32LG40-UA560 EBT43504901 Chassis Assembly SUB LA89A 32LG40-UA DVDP Assy

800-806 Plate,Metal METAL FRAMES820 MGJ40652302 Plate,Metal PRESS SECC 0.6T SHIELD SECC 32LG40 main shield 821 MGJ40315501 Plate PRESS EGI 0.8t FRAME SBHG-A 42LG50 METAL, SHIELD822 MGJ40651701 Plate,Shield PRESS SPTE 0.3T SHIELD SPTE SIDE AV900 AAN36842703 Base Assembly STAND 32LG40 LA89A STAND ASSY(WITHOUT STAND BODY910 MAZ42150502 Bracket MOLD ABS SUPPORTER 32LG40, DVDP - ABS STAND TOP

Part numbers subject to change. Check GCSC (aic.lgservice.com) for the current part numbers.

exPLODeD vIeW

300

121120

122123

500

510

800

804

801

803

805

802

806

400

900

910

200

560

822

540521

821 820530

531

550


32LG40


CIRCUIT DeSCRIPTIONS

CIRCUIT DeSCRIPTIONS 32LG40

F1013.15A/250V250V

P201To Main

AC In

F1005A/250V

= Warning, Hot Ground

P203To Ballast

POWeR SUPPLy (SMPS)

NoConnection

F1013.15A/250V250V

P201To Main

AC In

F1005A/250V

= Warning, Hot Ground

P203To Ballast

1 1


32LG40


CIRCUIT DeSCRIPTIONSPOwER SUPPlY CONNECTORS

P201 SMPS to P800 Main

Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check

23 N/C 0V 3.2V OL 24 N/C 0V 0V OL

21 BR1 0V 1.68V OL 22 PWM-DIM 0V 3.38V OL

19 PWR 0V 2.86V OL 20 INV On/Off 0V 3.29V OL

17 ERR 0V 3.3V 1.26V 18 ACD 5.05V 4.57V OL

15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd


11 5.2V 5.15V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V

9 5.2V 5.15V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V

7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V

5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V


1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V

BR1 Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

P203 SMPS to MCN1 BallastPin Label STBY Run Diode Check1 24V 0V 24.52V 0.33V

2 24V 0V 24.52V 0.33V

3 24V 0V 24.52V 0.33V

4 24V 0V 24.52V 0.33V

5 24V 0V 24.52V 0.33V

6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd

10 Gnd Gnd Gnd Gnd11 BR1 0V 1.67V OL


32LG40


CIRCUIT DeSCRIPTIONSPOwER SUPPlY TESTThe Power Supply must be producing STAND-BY +5V before performing this test. With the Power Supply disconnected from other boards and AC applied, confirm that the Power Supply is producing 5V from either Pins 9, 10, 11 or 12. If not, check the fuse. If the fuse is ok and there is no 5V, replace the Power Supply. If 5V is ok, continue.1st short either pin 9, 10, 11 or 12 (5V) to pin 19 (PWR) using a 10K resistor. The P201 connector should be disconnected from the Main board and AC not applied when adding the jumper. Re-apply power when testing.Confirm that the other low voltage power supplies are activated. Pins 1 and 2: 16V Pins 5 and 6: 12V Pin 18: AC Detect goes high Fuse F101: Check for 350V (Ballast Voltage)If any voltage missing, replace the Power Supply. If the 1st test was successful, leave the 10K resistor in place.BACklIGhT TESTTo test the Backlights, leave the 10K jumper in place from the previous test. Plug in the Backlight plug P203 and apply AC power. Observe the Backlights. If normal, LED1 on the Ballast board should turn on first, then the backlights should turn on and LED1 should go off.If no backlight activity, confirm the Fuse F101 has approximately 350V on both sides. If only on one side, check fuse for open. If no 350V on either side, replace the Power Supply. If 300V is present, check P203 for 24V on pins 1-5. Check P203 pin 12 for at least 3V (Inverter On/Off). If yes, confirm connectors to backlight are ok, if ok, then the panel is defective.

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

INV


32LG40


CIRCUIT DeSCRIPTIONSMAIN (DIGITAL) BOARD

3.39V0VReset (Lo-Hi)OUT3

9V0V+9VOUT3GndGndGndGnd2

GndGndGndGnd23.4V0VD3.3V_BCMIN1

12V0V+12VIN1RUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPINRESET GENERATOR TO IC401 (On Back)IC400

+9V RegulatorIC8031.29V0VDDRO_VTTOn/Off Control4

3.2V0V+5V_SUBIN32.6V0VD2.6V_BCMIN5,6,7

GndGndGndOUT21.29V0VDDRO_VTTOUT3,8

5V0V+3.3VGnd1RUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPIN2.6V BCMIC304

+3.3V Regulator (3.3V TMDS_SW)IC8023.1V0V+3.3VOUT8

0.6V0.6VReset (Lo-Hi)OUT35V0VUSB_PWR_Out_1OUT7

GndGndGndGnd23.4V0VBCM DDR PowerOn/Off Control3

3.41V3.41V3.3V_MICONIN15V0V+5VIN2

RUNSTBYNAMEFUNCTIONPINRUNSTBYNAMEFUNCTIONPIN

RESET GENERATOR FOR Q400IC405USB PowerIC201

3.39V0VReset (Lo-Hi)OUT3

9V0V+9VOUT3GndGndGndGnd2

GndGndGndGnd23.4V0VD3.3V_BCMIN1

12V0V+12VIN1RUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPINRESET GENERATOR TO IC401 (On Back)IC400

+9V RegulatorIC8031.29V0VDDRO_VTTOn/Off Control4

3.2V0V+5V_SUBIN32.6V0VD2.6V_BCMIN5,6,7

GndGndGndOUT21.29V0VDDRO_VTTOUT3,8

5V0V+3.3VGnd1RUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPIN2.6V BCMIC304

+3.3V Regulator (3.3V TMDS_SW)IC8023.1V0V+3.3VOUT8

0.6V0.6VReset (Lo-Hi)OUT35V0VUSB_PWR_Out_1OUT7

GndGndGndGnd23.4V0VBCM DDR PowerOn/Off Control3

3.41V3.41V3.3V_MICONIN15V0V+5VIN2


RESET GENERATOR FOR Q400IC405USB PowerIC201

MAIN (TOP) REGUlATOR ChECkS


32LG40



GndGndGndGnd11,18,19,20

n/cn/cn/cn/c14,15

2.66V0VD2.6V_BCMOUT1,2,3,4,5

3.41V0VPower_CTL_2.6VOn/Off Control17

4.98V0.36V+5V_SUBIN6,7,8,10

GndGndGndGndERUNSTBYNAMEFUNCTIONPIN

0V0V3.3VVST_MICONVccCD2.6V/A2.6V_BCM RegulatorIC809

0.6V0.6VResetResetBGndGndGndGnd5

RUNSTBYNAMEFUNCTIONPINn/cn/cn/cn/c4

RESET GENERATOR FOR MICRO IC407Q4005V0V+5VOUT3

GndGndGndGndE3.4V0VPower_CTL_3.3VOn/Off Control2

5V0VST_5VPull DownC8.9V0V+9VIN1

3.29V0VRL_ONOn/Off ControlBRUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPIND3.3V/A3.3V_BCM RegulatorIC807

5V SUB SWITCH CONTROLLER for Q801Q8023.4V0.1VD3.3V_BCMOUT4

5V0V+5V_SUBOUT5,6,7,8GndGndGndGnd3

0.28V0VQ802On/Off Control2,45V0.36V+5V_SUBIN2

5V0VST_5VIN1,33.4V0VPower_CTL_3.3VOn/Off Control1


5V SUB SWITCHQ801D3.3V/A3.3V_BCM Regulator turns on LD800IC806

GndGndGndGnd11,18,19,20

n/cn/cn/cn/c14,15

2.66V0VD2.6V_BCMOUT1,2,3,4,5

3.41V0VPower_CTL_2.6VOn/Off Control17

4.98V0.36V+5V_SUBIN6,7,8,10

GndGndGndGndERUNSTBYNAMEFUNCTIONPIN

0V0V3.3VVST_MICONVccCD2.6V/A2.6V_BCM RegulatorIC809

0.6V0.6VResetResetBGndGndGndGnd5

RUNSTBYNAMEFUNCTIONPINn/cn/cn/cn/c4

RESET GENERATOR FOR MICRO IC407Q4005V0V+5VOUT3

GndGndGndGndE3.4V0VPower_CTL_3.3VOn/Off Control2

5V0VST_5VPull DownC8.9V0V+9VIN1

3.29V0VRL_ONOn/Off ControlBRUNSTBYNAMEFUNCTIONPIN

RUNSTBYNAMEFUNCTIONPIND3.3V/A3.3V_BCM RegulatorIC807

5V SUB SWITCH CONTROLLER for Q801Q8023.4V0.1VD3.3V_BCMOUT4

5V0V+5V_SUBOUT5,6,7,8GndGndGndGnd3

0.28V0VQ802On/Off Control2,45V0.36V+5V_SUBIN2

5V0VST_5VIN1,33.4V0VPower_CTL_3.3VOn/Off Control1


5V SUB SWITCHQ801D3.3V/A3.3V_BCM Regulator turns on LD800IC806

MAIN (BOTTOM) REGUlATOR ChECkS


32LG40



Screen Print for Pin No is incorrect, use IC

GndGndGndGnd11,12,18,19,20

0V0Vn/cn/c13, 14,15,16

12.36V0VLVDS 12VOUT5,6,7,81.29V0VD1.2V_BCMOUT1,2,3,4,5

6.16V0VQ900On/Off Control2,43.41V0VPower_CTL_1.2VOn/Off Control17

12.36V0V12VIN1,35V0.38V+5V_SUBIN6,7,8,10


LVDS 12V SWITCHQ901D1.2V/A1.2V BCM REGULATORIC805

0V0VGndGndE3.29V0.26V3.3V_TMDS_SWIN3

0V0VLVDS Switch ControlPull Down 12VC1.8V0V'+1.8V_NTPOUT2

0.75V0VLVDS_PANEL_CTRLControlBGndGndGndGnd1


LVDS 12V SWITCH CONTROLLER Q901Q900+1.8V_NTP REGULATORIC801

GndGndGndGnd43.4V0VBCM_RESETOUT6

3.43V3.43V3.3VST_MICONOUT33.4V0VReset from IC400On/Off Control1

5V5VST_5VIN23.41V0VD3.3V_BCMIN14


ST-BY 3.3V DC-DC CONVERTERIC808BCM RESETIC401


GndGndGndGnd11,12,18,19,20

0V0Vn/cn/c13, 14,15,16

12.36V0VLVDS 12VOUT5,6,7,81.29V0VD1.2V_BCMOUT1,2,3,4,5

6.16V0VQ900On/Off Control2,43.41V0VPower_CTL_1.2VOn/Off Control17

12.36V0V12VIN1,35V0.38V+5V_SUBIN6,7,8,10


LVDS 12V SWITCHQ901D1.2V/A1.2V BCM REGULATORIC805

0V0VGndGndE3.29V0.26V3.3V_TMDS_SWIN3

0V0VLVDS Switch ControlPull Down 12VC1.8V0V'+1.8V_NTPOUT2

0.75V0VLVDS_PANEL_CTRLControlBGndGndGndGnd1


LVDS 12V SWITCH CONTROLLER Q901Q900+1.8V_NTP REGULATORIC801

GndGndGndGnd43.4V0VBCM_RESETOUT6

3.43V3.43V3.3VST_MICONOUT33.4V0VReset from IC400On/Off Control1

5V5VST_5VIN23.41V0VD3.3V_BCMIN14


ST-BY 3.3V DC-DC CONVERTERIC808BCM RESETIC401

MAIN BOARD X400 AND X200 ChECk

2.4Vp/p24Mhz

With set on or off

X400 2.4Vp/p24Mhz

With set on or off

X400

Main PWBX400 Location

Main PWBX200 Location

MAIN PWB

660mVp/p54Mhz

Only when set is on

X200660mVp/p

54Mhz

Only when set is on

X200

1.48V

1.49V

Use Crystal Side R232 or R233


32LG40



TUNER vIDEO AND SIF OUTPUT ChECkFor Easy Access, pop the shield off the tuner. If you leave the shield on you can still access the same pins. Be careful not to accidentally ground out you test lead on the shield.

Pin 16 Composite Video

Pin 14 Audio SIF

Pin 3 Tuner B+ (5V)

MAIN PWB

1Vp/p 20uSec rate

Pin 16 VideoSignal

1Vp/p 20uSec rate

Pin 16 VideoSignal

Pin 14 SIFSignal

850mVp/p 20nSec rate


32LG40


CIRCUIT DeSCRIPTIONSMAIN lvDS ChECkTo confirm that the Main board is outputting Picture Content signals, check P902 (LVDS) for output. Check pins 11-20. This signals vary, but looking for signals like the ones shown below on any of these pins will confirm the output of video content. This signal is using a standard SMTE Color Bar output from a generator as the input source. Remember there are actually 10 pins with LVDS signals. This only represents two waveforms as an example.

P902Location

Pin 11

Pin 16

MAIN PWB


32LG40



P800 Main to P201 SMPS P401 MAIN to Front KeysPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1, 2 16V 0V 16V OL 1 KEY3 3.4V 3.4V 1.4V3, 4 Gnd Gnd Gnd Gnd 2 KEY4 3.4V 3.4V 1.4V5, 6 12V 0V 11.8V 3.03V 3 Gnd 0V 0V Gnd7, 8 Gnd Gnd Gnd Gnd 4 Gnd 0V 0V Gnd

9, 10 ST-5V 5V 5.15V 1.23V 5 KEY-1 3.4V 3.4V 1.4V11, 12 ST-5V 5V 5.15V 1.23V 6 KEY-2 3.4V 3.4V 1.4V13, 14 Gnd Gnd Gnd Gnd 7 n/c 0V 0V OL15, 16 Gnd Gnd Gnd Gnd 8 ST-5V 5V 5V 0.53V

17 VBR-B 5V-MNT 0V 3.3V OL 9 PWM-LED 0V 0V 0.8V18 AC-DET 5V 4.57V OL 10 IR 4.1V 4.1V 2.3V19 RL-ON 0V 2.86V 1.25V 11 n/c 0V 0V OL20 INV-On/Off 0V 3.29V 2.15V 12 Gnd 0V 0V Gnd21 BR1 0V 1.68V OL 13 LED-G 0V 2.1V 0.8V22 VBR-B 0V 3.38V 2.15V 14 LED-R 2.1V 0V 0.8V23 n/c 0V 3.2V OL 15 Gnd 0V 0V Gnd24 n/c 0V 0V OL

ADIM Pin 21 varies according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

P904 Main to CN401 DVD PlayerPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 n/c 3.34V 3.34V OL 14 n/c 0V 0.7V OL

2 Disc Check 3.34V3.4V With Disc Player

0V No Disc Player 1.60V 15 n/c 0V 0V OL

3 n/c 3.34V 3.3V OL 16 DVD-SPDIF 3.38V 1.8V 0.83V4 n/c 3.34V 3.3V OL 17 DVD-MUTE 0V 0V OL5 Gnd 0V Gnd Gnd 18 DVD-L-In2 0V 2.4V OL6 Pr 0V 0.8V OL 19 Gnd 0V 0V Gnd7 Pb 0V 0.8V OL 20 DVD-R-In2 0V 2.4V OL8 Y 0V 0.6V OL 21 n/c 0V 0V OL9 Gnd 0V 0V Gnd 22 Gnd 0V 0V Gnd10 n/c 0V 0V OL 23 n/c 0V 0V OL11 Gnd 0V 0V Gnd 24 n/c 0V 0V OL12 n/c 0V 0V 0.83V 25 Gnd 0V 0V Gnd13 Gnd 0V 0V Gnd 26 n/c 0V 0V OL

MAIN vOlTAGES


32LG40


CIRCUIT DeSCRIPTIONSMAIN vOlTAGESFor locations, refer to the Main boards bottom view. The panel control is on pin 33 of IC407. Q900 turns on Q901, the LVDS Switch generats LVDS 12V. All voltages are shown on the Interconnect diagram in the schematics section. LVDS Signal Waveforms are shown on the back of Interconnect diagram.

LVDS 12VLVDS 12V

P902 Main to CN1 T-CONPin Label SBY Run Diode Check Pin Label SBY Run Diode Check1 LVDS 12V 0V 12.3V OL 2 LVDS 12V 0V 12.3V OL3 LVDS 12V 0V 12.3V OL 4 LVDS 12V 0V 12.3V OL5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd11 LVDS 0V 1.2V 0.98V 12 LVDS 0V 1.1V 0.98V13 LVDS 0V 1.2V 1.11V 14 LVDS 0V 1.05V 1.06V15 LVDS 0V 1.1V 1.06V 16 LVDS 0V 1.09V 1.05V17 LVDS 0V 1.08V 1.11V 18 LVDS 0V 1.13V 1.06V19 LVDS 0V 1.14V 1.11V 20 LVDS 0V 1.06V 1.06V21 n/c 0V n/c OL 22 n/c 0V n/c OL23 n/c 0V n/c Gnd 24 n/c 0V n/c OL25 Size Sel 0.4V 3.07V 3V 26 Gnd 0V 0V Gnd


32LG40



P500 Main to Speakers P200 Main Software DownloadPin Label SBY Run Diode Check Pin Label SBY Run Diode Check1 R+ 0V 8.14V 2.78V 1 Vcc 0V 5V OL2 R- 0V 8.14V 2.78V 2 SCL 0V 5V OL3 L+ 0V 8.15V 2.78V 3 SDA 0V 5V OL4 L- 0V 8.15V 2.78V 4 Gnd 0V 0V Gnd

P900 Main to P402 DVD PlayerPin Label Stby Run Diode Check

1 Disk-Enable 3.4V 3.4V No Disc 0V Disc In 1.68V

2 DVDP-RXD 0.7V 3.08V 3V3 DVDP-TXD 0.7V 3.4V 3V4 Gnd Gnd 0V Gnd

P901 Main to CN400 DVD PlayerPin Label Stby Run Diode Check1 12V 0V 12.3V 3V2 Gnd 0V 0V Gnd3 DVDP 3.3V 3.4V 3.37V .099V4 Gnd 0V 0V Gnd5 Gnd 0V 0V Gnd6 5V 0V 5.01 0.45V


32LG40



MCN1

To BacklightRight Side

To BacklightLeft Side

Transformers

Ballast Start DetLED LED1

F18A/125V

BALLAST ASSeMBLy

MCN1

Ballast Start DetLED LED1

To BacklightRight Side

To BacklightLeft Side

Transformers

F18A/125V


32LG40


CIRCUIT DeSCRIPTIONSBAllAST TRANSFORMER wAvEFORMSWarning: secondary is over 1.2Kv.

BAllAST hEAT SINkSBe sure to replace all heat sink materials and insulators.

T1/T2 Pin 6

TransformersTransformers

T1/T2 Pin 1

34V p/p 64.89kHz22.2V p/p 220kHz

PrimarySide

Protects the Outputs

Insulator

InsulatorShiny Side

Down(Conductive)

Cut Out

AlignmentNotch

Alignment Notch

Heat Transfer MaterialShield

MCN1 Ballast to P203 SMPSPin Label Stby Run Diode1 VBL 0V 24.52V OL2 VBL 0V 24.52V OL3 VBL 0V 24.52V OL4 VBL 0V 24.52V OL5 VBL 0V 24.52V OL6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd10 Gnd_1 Gnd Gnd Gnd11 BVR_A 0V 1.67V OL12 On/Off 0V 3.45V OL13 VBR_B 0V 3.40V OL14 Gnd_2 Gnd Gnd Gnd


32LG40


CIRCUIT DeSCRIPTIONSLCD DRIveR (T-CON)

If you test the TV with the shield off of the LCD Driver, reinstall the screws for grounding purposes. Use the Connector P902 on the Main board for Voltages and Signal readings.

lvDS CABlETo remove, press in from the sides and lift out. Be careful when removing, press the release tabs to avoid damage to the board or the cable.

CN2 CN3

CN1 LVDS

US2

To Main

To TFT Panel To TFT Panel

3) 0.0V2) 1.8V1) 3.3V

US2

12VF1

6.3V/1.5A

Press in Press in


32LG40


CIRCUIT DeSCRIPTIONSlCD DRIvER vOlTAGESUse P902 on the Main board for making voltage, resistance, and waveform checks.

CN1 LCD Drvier to P902 Main Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 LVDS 12V 0V 12.3V OL 2 LVDS 12V 0V 12.3V OL3 LVDS 12V 0V 12.3V OL 4 LVDS 12V 0V 12.3V OL5 Gnd 0V 0V Gnd 6 Gnd 0V 0V Gnd7 Gnd 0V 0V Gnd 8 Gnd 0V 0V Gnd9 Gnd 0V 0V Gnd 10 Gnd 0V 0V Gnd11 LVDS 0V 1.2V 0.98V 12 LVDS 0V 1.1V 0.98V13 LVDS 0V 1.2V 1.11V 14 LVDS 0V 1.05V 1.06V15 LVDS 0V 1.1V 1.06V 16 LVDS 0V 1.09V 1.05V17 LVDS 0V 1.08V 1.11V 18 LVDS 0V 1.13V 1.06V19 LVDS 0V 1.14V 1.11V 20 LVDS 0V 1.06V 1.06V21 n/c 0V n/c OL 22 n/c 0V n/c OL23 n/c 0V n/c Gnd 24 n/c 0V n/c OL25 Size Sel 0.4V 3.07V 3V 26 Gnd 0V 0V Gnd


32LG40


CIRCUIT DeSCRIPTIONSDvD PLAyeR

DvD PlAYER vOlTAGESResistance should be taken in diode mode with the connectors removed.*Pin 2: 3.4V with DVD Player and 0V with no DVD Player.

CN401 Connector DVD to P904 Main

Pin Label Stby Run Diode Check Pin Label Stby Run Diode Check

1 nc 3.34V 3.34V 3.13V 14 nc 0V 0.7V 0.15V

2 Check 3.34V *0V 3.13V 15 nc 0V 0V Gnd

3 nc 3.34V 3.3V 3.13V 16 SPDIF 3.38V 1.8V OL

4 nc 3.34V 3.3V 2.34V 17 DVDP-MUTE 0V 0V 2.3V

5 Gnd Gnd Gnd Gnd 18 DVDP-L 0V 2.4V 1.1V

6 DVDP-Pr 0V 0.8V OL 19 Gnd 0V 0V Gnd

7 DVDP-Pb 0V 0.8V OL 20 DVDP-R 0V 2.4V 1.1V

8 DVDP-Y 0V 0.6V OL 21 nc 0V 0V OL

CN400 DVD to P901 Main CN402 DVD to P900 MainPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 P12V 0V 12.3V 3.22V 1 GP101 3.4V 0V OL2 Gnd Gnd Gnd Gnd 2 TXD1 0.7V 3.08V OL3 P3.3V 3.4V 3.37V 0.78V 3 RXD1 0.7V 3.4V OL4 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd5 Gnd Gnd Gnd Gnd6 P5V 0V 5V 1.2V


32LG40


CIRCUIT DeSCRIPTIONSFRONT BOARD

FRONT vIEw

REAR vIEw

J2 J1To Main PWBTo Side Keys PWB ZD3

3.4V Zener

ZD15V Zener

ZD24.1V Zener

POWERBUTTON

IR Receiver

POWER LED


32LG40


CIRCUIT DeSCRIPTIONSFRONT BOARD vOlTAGESResistance should be taken in diode mode with the connectors removed.

SIDE CONTROl kEYSResistance should be taken in diode mode with the connectors removed.

P101 Side Control to J2 FrontPin Label Stby Run Diode Check1 Key 1 3.4V 3.4V OL2 Gnd 0V 0V Gnd3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd5 Key 3 3.41V 3.41V OL6 Gnd 0V 0V Gnd7 Key 4 3.41V 3.41V OL8 Gnd 0V 0V Gnd

J1 Front board to P401 Main J2 Front board to P101 Side KeyPin Label Stby Run Diode Check Pin Label Stby Run Diode Check1 KEY3 3.4V 3.4V OL 1 Key 1 3.4V 3.4V OL2 KEY4 3.4V 3.4V OL 2 Gnd 0V 0V Gnd3 Gnd 0V 0V Gnd 3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd 4 Gnd 0V 0V Gnd5 KEY-1 3.4V 3.4V OL 5 Key 3 3.41V 3.41V OL6 KEY-2 3.4V 3.4V OL 6 Gnd 0V 0V Gnd7 n/c 0V 0V OL 7 Key 4 3.41V 3.41V OL8 ST-5V 5V 5V 2.7V 8 Gnd 0V 0V Gnd9 PWM-LED 0V 0V 2.4V

10 IR 4.1V 4.1V OL11 n/c 0V 0V OL12 Gnd 0V 0V Gnd13 LED-G 0V 2.1V 3.2V14 LED-R 2.1V 0V 3.2V

15 Gnd 0V 0V Gnd


32LG40



P101 Side Control to J2 FrontPin Label Stby Run Diode Check1 Key 1 3.4V 3.4V OL2 Gnd 0V 0V Gnd3 Key 2 3.41V 3.41V OL4 Gnd 0V 0V Gnd5 Key 3 3.41V 3.41V OL6 Gnd 0V 0V Gnd7 Key 4 3.41V 3.41V OL8 Gnd 0V 0V Gnd

INvISIBLe SPeAkeR SySTeM

Bottom View of Woofer Ports

Woofers

Tweeters Tweeters

Stand Removed

- 38 -


42LG60


DISASSeMBLy

DISASSeMBLy 42LG60INTRODUCTION

This section of the manual will discuss Disassembly of the 42LG60 LCD Direct View Television. Upon completion of this section the Technician will have a better understanding of the disassembly procedures.

BACk COveR ReMOvALRemove the 13 screws shown. Pay attention to the size and type of screw as there are different types. Putting in the improper screw when reassembling may cause damage. Handle the TV carefully while the 4 stand screws are removed. The stand fits snuggly, but could fall out and cause injury. For safety, put the 4 stand screws back after removing the back cover.

BOARD LAyOUT

LCD Driver (T-CON)

Backlight Connection

Control Board

Power Supply Main Board


LVDSCables

With shield removed


42LG60


DISASSeMBLy

MAIN BOARD ReMOvALDisconnect P401, P501, P800, P801, and P900. Note: In the bottom right is connector P200. This is an open connection. Remove the 2 screws securing the Side input decorative plastic piece on the right. Remove the 6 screws securing the Main board indicated below. The Main board can also be lifted off the mounting frame by disconnecting P401 and P501. Remove the 1 screw securing the top mounting frame and swing the board away.

POWeR SUPPLy (SMPS) ReMOvALDisconnect P2, AC In, P402, and P402. Remove the 6 screws indicated below.


42LG60


DISASSeMBLyCONTROL BOARD ReMOvAL

Disconnect P101, P102 P103, and P104. Remove the LVDS cables by pressing in from the sides to release and then lift them out. Be careful when removing the LVDS Cables, theyre fragile. Press the release tabs to avoid damage to board or to the cable itself. Remove the 4 screws indicated below.

LCD DRIveR BOARD ReMOvALDisconnect CN1, CN2, CN3, and CN4. Remove the 3 screws indicated below.


42LG60


DISASSeMBLy

ToTweeters

Speaker BoxRemoved

SPeAkeR BOx ReMOvALTo remove the Speaker Box, remove the 4 screws show in circles. Then remove the wire harness. Carefully disconnect both Tweeters. Unplug P500 from the Main board.


42LG60


DISASSeMBLyexPLODeD vIeW

Loc Part No Description Specification120 EAB41280401 Speaker,Full Range G1640401 FERRITE 10W 8OHM 82DB 110HZ 193.5X42X30121 EAB41284401 Speaker,Tweeter D025D12K1400(0/90) 33uF/50V 20W 4OHM 68DB 590HZ 122 ABA35890405 Bracket Assembly BRACKET 42LG30/50/70 - SPEAKER WOOFER BRACKET AS200 EAJ41866501 LCD Module LC470WUD-SAA1 FULLHD 47INCH 1920X1080 500CD COLO300 ABJ36383007 Cabinet Assembly 47LG70-UA Chicago 120Hz LA86A 47 47LG70_CABINET400 ACQ36384907 Cover Assembly,Rear 47LG70/90-UA Chicago 120Hz LA86A 47 47LG70/90_B500 EBR42600103 PCB Assembly,Front 47/52LG70 LED & P/SW T.T LC81E LG70 47,52 Breath510 EBR42056602 PCB Assembly,Sub CONTROL T.T LC81E 42/47LG70ED-CA . Soft touch co520 ABA35569906 Bracket Assembly BRACKET LG70 AB Side AV bracket assy(CHICAGO_120521 MGJ40651702 Plate,Shield PRESS SPTE 0.3T SHIELD SPTE SIDE AV for SKD530 EAY40505301 SMPS,AC/DC 08H 4247 90VTO264V 400W 50~60Hz UL/CSA/SEMKO Yu540 EBU50595701 Main Total Assembly 47LG70-UA.SUSQLJM BRAND LA86A550 EBT43368401 Chassis Assembly POWER(SMPS) - 47inch LG30/50 AC-INLET 150_straig810 MGJ40350204 Plate,Metal PRESS SECC 1.0 METAL SECC 47LG70 METAL MODULE820 MGJ40842103 Plate,Shield PRESS SECC 0.8T SHIELD SECC 42LG70_CHICAGO_120HZ830 MGJ41070804 Plate,Metal PRESS SBHG 0.6T SHIELD EGI PRESS SBHG 0.6T 840 MGJ40603902 Plate,Metal PRESS EGI 1.6 METAL EGI 47LG50 SHIELD PLATE 900 AAN35804113 Base Assembly STAND 47/52LG70 - 47/52LG70 Stand Assy LGEMX Loc

Part numbers subject to change. Check GCSC (aic.lgservice.com) for the current part numbers.

300

200801

400

901

900540820

530580810

120500

121560

510

803804 570

840

520521

830805802

- 44 -


42LG60



CIRCUIT DeSCRIPTIONS 42LG60INTRODUCTION

LCD Driver (T-CON)


Control Board

Power Supply Main Board


LVDSCables

With shield removed

Tuner

Digital Audio

Opitcal AudioRemote In

ComponentY/Pr/Pb

HDMI 1/2/3

PGB (PC) Audio

PGB (PC)

RS-232


42LG60


CIRCUIT DeSCRIPTIONSBACkLIGHT LAyOUT

Back View 18 Bulbs

Power Supply with Ballast

To Backlights Over 1.2KV

58Khz


42LG60



POwER SUPPlY vOlTAGES

INPUT AC 100V ~ 240V (50/60Hz) 3A

OUTPUT

St-by 5.2V (5A)

12V (2A)

16.5V (1.3A)

P401-P402 950V / 135mA

MODEL PLHL-T715A

F700 F101AC IN

P2 - To Main

P402To Backlight

P401To Backlight

8A/250V

5A/250V335V

P2 SMPS to P801 MainOdd Label Stby Run Diode Check Even Label Stby Run Diode Check

1 16V 0V 16V 0.94V 2 16V 0V 16V 0.94V3 Gnd Gnd Gnd 0V 4 Gnd Gnd Gnd 0V5 12V 0V 11.8V 1.32V 6 12V 0V 11.8V 1.32V7 Gnd Gnd Gnd 0V 8 Gnd Gnd Gnd 0V9 5V 5V 5.15V 1.49V 10 5V 5.15V 5.15V 1.49V11 5V 5V 5.15V 1.49V 12 5V 5.15V 5.15V 1.49V13 Gnd Gnd Gnd 0V 14 Gnd Gnd Gnd 0V15 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V17 ERR 3.19V 3.3V OL 18 ACD 4V 4.57V 1.85V19 PWR 0V 2.86V OL 20 INV 0V 3.29V OL21* ADIM 0.1V 1.68V OL 22 PDIM 0V 3.38V OL23 SEL 0V 3.2V OL 24 SYNC 0V 0V OL (Not Used)

* ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

POWeR SUPPLy LAyOUT


42LG60


CIRCUIT DeSCRIPTIONSPOwER SUPPlY TESTTo test everything but the backlights. Disconnect the P2 connector from the Main board. With the Power Supply disconnected from other boards and AC applied, confirm that the Power Supply is producing 5V from either pins 9, 10, 11 or 12. If not, check the fuse. If the fuse is ok and theres no 5V, replace the Power Supply. If 5V is ok then continue.Remove AC power when adding the jumpers shown in the image. Apply power when making the test. Short either pins 9, 10, 11 or 12 (5V) to pin 19 (PWR) using a 10K resistor. This turns on the power supply. Confirm that the other low voltage power supplies are activated. Pins 1 and 2 should be 16V. Pins 5 and 6 should be 12V. Pin 18 (AC Detect) should go high. BACklIGhT TESTIf the 1st test was successful, continue. Remove the power, leave the original 10K in place, and add a jumper between pin pin 19 (PWR) to pin 20 (INV). Apply AC Power to the board and observe the Backlights. If normal, the backlights should turn on and off 4 times then go off.If only 1/2 the backlights light (right side or left side), confirm the connectors are ok. Check the Transformer left and right center pins for a signal. If ok, the panel is defective due to a backlight failure. If the pulse is missing on one side (L or R center legs) of the transformer, the power supply is defective.If there is no backlight activity, confirm the Fuse F700 has approx. 300V on both sides. If only on one side, check fuse for open. If there is no 300V, replace the Power Supply.If 300V DC is present, observe the L and R center legs on the left hand side of ballast transformer T701. Look for 58Khz pulse at 8.7V p/p. If yes, confirm the connectors to backlight are ok. If ok, then the panel is defective. If no pulse is found, replace the Power Supply.BACklIGhT vOlTAGES

Caution backlight peak-to-peak over 1KV (Freq. 54Khz). Pins 1 and 2 are actually shorted together (Either plug). Reading between P401 and P402 reads the Transformer T701 (0.1V).

P401 and P402 BacklightsPin STBY Run Diode Check1 0V >1Kac 0V2 0V >1Kac 0V

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

INV

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

P23 17 511 915 1319 1723 21

4 28 612 1016 1420 1824 22

+5VPWR

10K

INV


42LG60


CIRCUIT DeSCRIPTIONSCONTROL BOARD LAyOUT

To LCD Driver (T-CON)

P104P103

P101LVDS

P102To Main

Control Board Regulators


42LG60


CIRCUIT DeSCRIPTIONSLocking Tabs

Press In Press In

lvDS CABlELVDS stands for Low Voltage Differential Signals. The LVDS cable carries video signals from the Main board to the Control board Their signals can be confirmed with the Oscilloscope by monitoring the LVDS signals with no input signal selected while pressing the Menu button on and off with the remote control or keypad. Loss of these signals would confirm the failure is on the Main board. To remove the connector, press the two outside tabs inward and pull.

CONTROl BOARD CRYSTAl TEST

The Control board contains the MICRONAS chip IC101. This IC is a Full-HD Rate Converter with Motion Blur Removal and Film De-Juddering for 1080p 100/120 Hz LCD panels. It features:

Vector based motion compensation Dual 10 bit LVDS input Quadruple 12 bit LVDS output

1.7 Vp/p20.25 Mhz

(Only when set is on)


42LG60


CIRCUIT DeSCRIPTIONSLCD DRIveR (T-CON) LAyOUT

CN1

To LCD Panel

To Control Board

CN2

CN5 CN4

U15

U16

UC1

F1

US1

LD1


42LG60


CIRCUIT DeSCRIPTIONSlCD DRIvER (T-CON) TESTS

Check Fuse F1 for 12V.

Check the regulator US1 for correct voltage.

LD1 1.8V

US10V

3.2V

Use LD1 to determine if The boot up sequence of The T-CON is OK. If all is OK, this LED will turn bright blue shortly after power is applied then go out shortly after backlights illuminate .

F1

CN1

LCD Driver LED StatusPower Off Power 1st On Power On Anode 0V Anode 11.6V Anode 11.6V

Cathode 0V Cathode 0V Cathode 9.5VLED OFF LED ON LED OFF


42LG60


CIRCUIT DeSCRIPTIONSMAIN BOARD LAyOUT

If odd video problems are found, use some freeze spray on IC100 and its circuits.If the video returns to normal, the board needs to be replaced.

P801Power Supply

P800 P900

To Control Board

P401To Control Panel

P501To Speakers

P200[Empty]

IC100


42LG60


CIRCUIT DeSCRIPTIONSMAIN BOARD UNDERSIDE

IC4053.29V

0V0.6V

3.31V0V

0.6V

123

SBY RUN IC8100V0V

0.3V

0V1.8V

3.31V

123

SBY RUN

BCM ResetIC100

Video Processor

IC4000.4V

0V0.4V

3.37V0V

3.39V

123

SBY RUN IC805 0.V0V0V

0.4V0.1V

3.3V BCM5V0V

3.39V1.2V

12345

IC8020V

0.3V0V

5V3.3V

0V

123

SBY RUN

IC101

Use the left side of L206

Micro Crystal

Video Crystal

(Only when set is on)

780 mVp/p54 Mhz

(Set is on or o)

2.4 Vp/p24 Mhz

MAIN BOARD CRYSTAl ChECk


42LG60


CIRCUIT DeSCRIPTIONSMAIN BOARD lD803 ChECkUse LD803 as a visual aid. This lets you know if the +5V is being converted to 3.3V for the BCM chip IC100. If LD803 is illuminated, +3.3V is ok. Only half of the dual LED is used.

MAIN BOARD TUNER ChECkFor easy access, pop the shield off the tuner. If you leave the shield on you can still access the same pins, but be careful not to accidentally ground out your test lead on the shield. Note: This is a picture from a different model, but the concept is the same.

Pin 14 Audio SIF

Pin 16 Composite Video

Pin 14 Pin 16

Pin 3 Tuner B+ (5V)

MAIN PWB

LD803


42LG60



Pin 16 Video Signal

Pin 14SIF Signal

17

161514

1312

11

10

987

6

54

3

2

1

TDVF-H051FEBL37676801

NC_1RF-AGC

+B (5V)

VTU

NC_2GND

SDASCL

ASDIGITAL_IF1DIGITAL_IF2

IC_AGC

AUDIO_OUTSIF

IF_ASVIDEO_OUT

Shield

Not UsedNot Used

Not UsedNot Used

Not Used

Not Used

Not Used

850mVp/p 20nSec rate

1Vp/p 20uSec rate

MAIN BOARD lvDS P900 ChECkTo confirm that the Main board is outputting Picture Content signals, check P900 (LVDS) cable for output. Check 11-22 and 27-38. This signals vary, but looking for signals like the ones shown below on any of these pins will confirm the output of video content. This signal is using a standard SMTE Color Bar output from a generator as the input source. Below is just a sample of two pins on the LVDS. There are 24 pins carrying video.

Test the waveforms while using a SMTE color bar signal as the input.

P900Location

MAIN PWB

Pin 11

Pin 16


42LG60


CIRCUIT DeSCRIPTIONSMAIN BOARD CONNECTORS

Resistance taken in Diode Mode with connectors removed.

P900 Main to P104 ControlPin Stby Run Diode Pin Stby Run Diode 1 0V 11.7V OL 2 0V 11.7V OL3 0V 11.7V OL 4 0V 11.7V OL5 0V 0V Gnd 6 0V 0V Gnd7 0V 0V Gnd 8 0V 0V Gnd9 0.47V 3.3V 1V 10 0V 3.3V 1V11 0V 1.14V 1V 12 0V 1.14V 1V13 0V 1.11V 1V 14 0V 1.11V 1V15 0V 1.12V 1V 16 0V 1.05V 1V17 0V 1.11V 1V 18 0V 1.11V 1V19 0V 1.16V 1V 20 0V 1.07V 1V21 0V 1.14V 1V 22 0V 1.05V 1V23 0V 0V OL 24 0V 3.25V 1.28v25 0.5V 3.15V 2.98V 26 0V 3.3V 3V27 0V 1.14V 1V 28 0V 1.14V 1V29 0V 1.12V 1V 30 0V 1.09V 1V31 0V 1.14V 1V 32 0V 1.07V 1V33 0V 1.07V 1V 34 0V 1.13V 1V35 0V 1.16V 1V 36 0V 1.07V 1V37 0V 1.16V 1V 38 0V 1.07V 1V39 0V 0V OL 40 0V 0V Gnd

Switched LVdS 12V

ScL

Video SignaL

n/c

Sda

FRc ReSet

Video SignaL

n/c

P501 Main to Speakers

Pin Stby Run Check1 0V 8V 2.58V2 0V 8V 2.58V3 0V 8V 2.58V


42LG60


CIRCUIT DeSCRIPTIONSP801 Main to P2 SMPS

Odd Label Stby Run Diode Check Even Label Stby Run Diode Check1 16V 0V 16V 0.94V 2 16V 0V 16V 0.94V3 Gnd Gnd Gnd 0V 4 Gnd Gnd Gnd 0V5 12V 0V 11.8V 1.32V 6 12V 0V 11.8V 1.32V7 Gnd Gnd Gnd 0V 8 Gnd Gnd Gnd 0V9 5V 5V 5.15V 1.49V 10 5V 5.15V 5.15V 1.49V11 5V 5V 5.15V 1.49V 12 5V 5.15V 5.15V 1.49V13 Gnd Gnd Gnd 0V 14 Gnd Gnd Gnd 0V15 Gnd Gnd Gnd 0V 16 Gnd Gnd Gnd 0V17 ERR 3.19V 3.3V OL 18 ACD 4V 4.57V 1.85V19 PWR 0V 2.86V OL 20 INV 0V 3.29V OL21* ADIM 0.1V 1.68V OL 22 PDIM 0V 3.38V OL23 SEL 0V 3.2V OL 24 SYNC 0V 0V OL (Not Used)

* ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%

P401 MAIN to Front KeysPin Stby Run Diode Check1 3.25V 3.25V 2.26V2 3.25V 3.25V 2.26V3 0V 0V Gnd4 0V 0V Gnd5 3.3V 3.3V 1.85V6 3.3V 3.3V 1.85V7 3.3V 3.3V 0.71V8 5V 5V 1.47V9 0V 0V Gnd10 3.92V 3.92V 1.35V11 0V 0V OL12 0V 0V Gnd13 0V 0V OL14 0V 0V OL15 0V 0V Gnd

P800 Main to P102 ControlPin Stby Run Diode Check1 0V 5V 0.8V2 0V 5V 0.8V3 0V 0V Gnd4 0.5V 3.3V 0.55V5 0V 0V Gnd6 0V 16V OL7 0V 16V OL8 0V 0V Gnd9 3.3V 3.3V 1.39V10 3.3V 3.3V 1.28V11 3.3V 3.3V 1.24V12 3.3V 3.3V 1.29V13 3.3V 0V 1.35V


42LG60



P401 MAIN to Front KeysPin Stby Run Diode Check1 3.25V 3.25V 2.26V2 3.25V 3.25V 2.26V3 0V 0V Gnd4 0V 0V Gnd5 3.3V 3.3V 1.85V6 3.3V 3.3V 1.85V7 3.3V 3.3V 0.71V8 5V 5V 1.47V9 0V 0V Gnd10 3.92V 3.92V 1.35V11 0V 0V OL12 0V 0V Gnd13 0V 0V OL14 0V 0V OL15 0V 0V Gnd

FRONT lED & POwER TOUCh

J1

Front PWBAssembly

To Main

FRONT CONTROl ASSEMBlYThe Intelligent Sensor and IR Sensor are located on the front of this board.

J3

J2

J1

To Front Touch LED PWB

To Main PWB

To Side KeyControl PWB

Right Tweeter

Light Diffuser for the Intelligent Sensor

Light Diffuser for the Intelligent Sensor

IR Sensor


42LG60



CONTROl PANEl vOlTAGES

J2 Ft Control to J1 LED J1 Front Keys to Main P401Pin Stby Run Pin Stby Run 1 3.3V 3.3V 1 3.25V 3.25V2 3.3V 3.3V 2 3.25V 3.25V3 5V 5V 3 0V 0V4 0V 0V 4 0V 0V5 0V 0V 5 3.3V 3.3V6 0V 0V 6 3.3V 3.3V7 3.3V 3.3V 7 3.3V 3.3V8 0V 0V 8 5V 5V9 3.3V 3.3V 9 0V 0V

10 3.92V 3.92VJ3 Ft Control to P100 Side Ctrls 11 0V 0V

Pin Stby Run 12 0V 0V1 3.3V 3.3V 13 0V 0V2 0V 0V 14 0V 0V3 3.3V 3.3V 15 0V 0V4 0V 0V

To FrontControl PWB

P100

SIDE CONTROl PANEl


42LG60


CIRCUIT DeSCRIPTIONSINvISIBLe SPeAkeR SySTeM LAyOUT

RightTweeter

LeftTweeter

Right Speaker Box

LeftSpeaker Box

ToTweeters

Speaker BoxRemoved

Fall 2008 LCD Training

PDP Training - Fall 2008 67 Schematics 67

32LG40

32LG40 :: InterconnectSchematics

P401

LD800

MCN1

54 Meg

24 Mhz

Reset

Grayed Out ICs are located on Back

X400

X200

IC809

IC400

*

32LG40 INTERCONNECT DIAGRAM

P800

P901

P900

P904

J2 J1

BallastPower Supply

Main (Digital) Board

T-CON Board

Front PWB Assembly(Interface)

Side

(Key

) Con

trol

s

P200

P500

A/C In

P203

P201P202

SoftwareUpgrades

F101

F100

To Backlight

To Backlight

Right Side

Left Side

CN1

SC100

L

N

A/C Fuse5A / 250V

380 Fuse3.15A / 250V

F124V

8A / 150V

IR ReceiverPower Button

To Speakers

P101

P902 Pin 11

P201 Even "SMPS" to P800 "Main PWB"Pin Label STBY Run Diode Check Pin Label STBY Run Diode Check1 16.5V 0V 16V 0.31V 2 16.5V 0V 16V 0.31V3 Gnd Gnd Gnd Gnd 4 Gnd Gnd Gnd Gnd5 12V 0V 11.8V 1.69V 6 12V 0V 11.8V 1.69V7 Gnd Gnd Gnd Gnd 8 Gnd Gnd Gnd 0V9 5.2V 5.15V 0.34V 10 5.2V 5.15V 5.15V 0.34V11 5.2V 5.15V 0.34V 12 5.2V 5.15V 5.15V 0.34V13 Gnd Gnd Gnd Gnd 14 Gnd Gnd Gnd Gnd15 Gnd Gnd Gnd Gnd 16 Gnd Gnd Gnd Gnd17 ERR 0V 3.3V 1.26V 18 ACD 5.05V 4.57V OL19 PWR 0V 2.86V OL 20 INV-On/Off 0V 3.29V OL21 BR1 0.1V 1.68V OL 22 PWM-DIM 0V 3.38V OL23 N/C 0V 3.2V OL 24 N/C 0V 0V OL

P201 Odd "SMPS" to P800 "Main PWB"

P203 "SMPS" to P209 "Ballast PWB"Pin Label STBY Run Diode Check1 24V 0V 24.52V 0.33V2 24V 0V 24.52V 0.33V3 24V 0V 24.52V 0.33V4 24V 0V 24.52V 0.33V5 24V 0V 24.52V 0.33V6 Gnd Gnd Gnd Gnd7 Gnd Gnd Gnd Gnd8 Gnd Gnd Gnd Gnd9 Gnd Gnd Gnd Gnd10 Gnd Gnd Gnd Gnd11 BR1 1.67V OL12 INV On-Off 3.45V OL13 PWM-DIM 3.40V OL14 ERROR 0V OL

BSM

0V0V0V0V

5.15V5.15V

IC806

IC801

IC807

TUNER

IC803

IC00BCM

P902

IC80

8

Q901

IC401

IC805

Far left and right pins are not counted, they are ground.

F1 6.3V/1.5A

US2

12V

3) 0.0V2) 1.8V1) 3.3V

IC802

Q400IC405

Q900

IC801

LD1Ballast

Drive LED

ExampleOf LVDS

Signal

IC201 IC405 IC806 Q801PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN2 IN +5V 0V 5V 1 IN 3.3V_MICON 3.41V 3.41V 1 On/Off Control Power_CTL_3.3V 0V 3.4V 1,3 IN ST_5V 0V 5V3 On/Off Control BCM DDR Power 0V 3.4V 2 Gnd Gnd Gnd Gnd 2 IN +5V_SUB 0.36V 5V 2,4 On/Off Control Q802 0V 0.28V7 OUT USB_PWR_Out_1 0V 5V 3 OUT Reset (Lo-Hi) 0.6V 0.6V 3 Gnd Gnd Gnd Gnd 5,6,7,8 OUT +5V_SUB 0V 5V8 OUT +3.3V 0V 3.1V IC802 4 OUT D3.3V_BCM 0.1V 3.4V Q802

IC304 PIN FUNCTION NAME STBY RUN IC807 PIN FUNCTION NAME STBY RUNPIN FUNCTION NAME STBY RUN 1 Gnd +3.3V 0V 5V PIN FUNCTION NAME STBY RUN B On/Off Control RL_ON 0V 3.29V3,8 OUT DDRO_VTT 0V 1.29V 2 OUT Gnd Gnd Gnd 1 IN +9V 0V 8.9V C Pull Down ST_5V 0V 5V

5,6,7 IN D2.6V_BCM 0V 2.6V 3 IN +5V_SUB 0V 3.2V 2 On/Off Control Power_CTL_3.3V 0V 3.4V E Gnd Gnd Gnd Gnd4 On/Off Control DDRO_VTT 0V 1.29V IC803 3 OUT +5V 0V 5V Q400

IC400 PIN FUNCTION NAME STBY RUN 4 n/c n/c n/c n/c PIN FUNCTION NAME STBY RUNPIN FUNCTION NAME STBY RUN 1 IN +12V 0V 12V 5 Gnd Gnd Gnd Gnd B Reset Reset 0.6V 0.6V1 IN D3.3V_BCM 0V 3.4V 2 Gnd Gnd Gnd Gnd IC809 C Vcc 3.3VVST_MICON 0V 0V2 Gnd Gnd Gnd Gnd 3 OUT +9V 0V 9V PIN FUNCTION NAME STBY RUN E Gnd Gnd Gnd Gnd3 OUT Reset (Lo-Hi) 0V 3.39V 6,7,8,10 IN +5V_SUB 0.36V 4.98V

17 On/Off Control Power_CTL_2.6V 0V 3.41V1,2,3,4,5 OUT D2.6V_BCM 0V 2.66V

14,15 n/c n/c n/c n/c11,18,19,20 Gnd Gnd Gnd Gnd

5V SUB SWITCH

5V SUB SWITCH CONTROLLER for Q801

RESET GENERATOR FOR MICRO IC407RESET GENERATOR TO IC401 (On Back)

RESET GENERATOR FOR Q400

2.6V BCM+3.3V Regulator (3.3V TMDS_SW)

USB Power

+9V Regulator

D3.3V/A3.3V_BCM Regulator turns on LD800

D3.3V_BCM Regulator (Also A3.3V_BCM)

D2.6V_BCM Regulator (Also A2.6V_BCM)

IC401 IC808PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN14 IN D3.3V_BCM 0V 3.41V 2 IN ST_5V 5V1 On/Off Control Reset from IC400 0V 3.4V 3 OUT 3.3VST_MICON 3.43V6 OUT BCM_RESET 0V 3.4V 4 Gnd Gnd Gnd Gnd

IC801 Q900PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN1 Gnd Gnd Gnd Gnd B Control LVDS_PANEL_CTRL 0V 0.75V2 OUT +1.8V_NTP 0V 1.8V C Pull Down 12V LVDS Switch Control 0V 0V3 IN 3.3V_TMDS_SW 0.26V 3.29V E Gnd Gnd 0V 0V

IC805 Q901PIN FUNCTION NAME STBY RUN PIN FUNCTION NAME STBY RUN

6,7,8,10 IN +5V_SUB 0.38V 5V 1,3 IN 12V 0V 12.36V17 On/Off Control Power_CTL_1.2V 0V 3.41V 2,4 On/Off Control Q900 0V 6.16V

1,2,3,4,5 OUT D1.2V_BCM 0V 1.29V 5,6,7,8 OUT LVDS 12V 0V 12.36V13, 14,15,16 n/c n/c 0V 0V

11,12,18,19,20 Gnd Gnd Gnd Gnd


LVDS 12V SWITCH

LVDS 12V SWITCH CONTROLLER Q901

BCM RESET

+1.8V_NTP REGULATOR

D1.2V/A1.2V BCM REGULATOR

ST-BY 3.3V DC-DC CONVERTER

5V3.43V

REGULATORS/ICs ON BACKREGULATORS/ICs ON FRONT

CN2 CN3

TO TFT MODULE

To Force Power Supply On.Disconnect P800 on Main PWB.Jump 5V to pin 19.Ballast and All voltages should turn on.

DVD Drive

CN400

CN401

CN403

CN402

Not Used


32LG40

32LG40 :: WaveForms

32LG40 LVDS P902 WAVEFORMS

32LG40 LVDS CABLE WAVEFORMS:Waveforms taken using SMTP Color Bar input.All readings give the Scale and Time Base related to scope settings. Top waveform in each image gives a slower rate.10mV at 5uS per division.Bottom waveform shows a blow up sample. 10mV at 2uS per division.


32LG40

32LG40 :: maIn Board :: maIn mIcro

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

rese

rved

. O

nly

for t

rain

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and

serv

ice

purp

oses

LGE

Inte

rnal

Use

Onl

y

The symbol refers to safety components. Only replace with LG parts.


32LG40

32LG40 :: maIn Board :: audIo

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

rese

rved

. O

nly

for t

rain

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and

serv

ice

purp

oses

LGE

Inte

rnal

Use

Onl

y



32LG40

32LG40 :: maIn Board :: memory

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

rese

rved

. O

nly

for t

rain

ing

and

serv

ice

purp

oses

LGE

Inte

rnal

Use

Onl

y



32LG40

32LG40 :: maIn Board :: Bcm/usB

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

rese

rved

. O

nly

for t

rain

ing

and

serv

ice

purp

oses

LGE

Inte

rnal

Use

Onl

y


Side USB


32LG40

32LG40 :: maIn Board :: dcm

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

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purp

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LGE

Inte

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Use

Onl

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32LG40

32LG40 :: maIn Board :: Lvds/dvd

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

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for t

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and

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ice

purp

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LGE

Inte

rnal

Use

Onl

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32LG40

32LG40 :: maIn Board :: tuner PoWer

Cop

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2008

LG

Ele

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nics

. Inc

. All

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purp

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LGE

Inte

rnal

Use

Onl

y



32LG40

32LG40 :: maIn Board :: JackPacks

Cop

yrig

ht

2008

LG

Ele

ctro

nics

. Inc

. All

right

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rved

. O

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for t

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and

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ice

purp

oses

LGE

Inte

rnal

Use

Onl

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32LG40

32LG40 :: maIn Board :: HdmI

Cop

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ht

2008

LG

Ele

ctro

nics

. Inc

. All

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and

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purp

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LGE

Inte

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Use

Onl

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HDMI 1

HDMI 2


42LG60

42LG60 :: Interconnect

P900P800

P401P501

P801

TUNERATSC/QAM/

NTSC

IC100BCM

IC302

IC300

IC303

IC301 IC404

IC1000

X200 (54Mhz)

IC800IC806

IC402

IC503

IC701

IC600 IC820

CN5 CN4

TFT-Drive (T-CON)CN1 CN2

P103 P104

CONTROL P102

P101

LVDS

POWER SUPPY J1J2

J1J3

P2

LVDS

Ft. TOUCHLED/Push Sw

SpkSpk

Ft. PWB Assy.

AC In

LeftBacklight

Plug

RightBacklight

Plug

TFT PANEL

IC101IC103

IC102

IC108 IC109 IC110

5 (2.5V)4 (0V)3 (0V)2 (3.3V)1 (3.37V)

5 (0V)4 (1.79V)3 (0V)2 (3.36V)1 (3.29V)

5 (1.2V)4 (1.3V)3 (0V)2 (3.37V)1 (3.29V)

X10120.25Mhz

UC1LD1U15

U16

US10V

3.2V 1.8V

3A 125V11.6V

SET 0FFLED OFF

SET ONLED OFF

LD1 Blue LED TFT Drive PWB Check

AnodeCathode

0V0V

BOOT OKLED ON

AnodeCathode

11.6V0V

AnodeCathode

11.6V9.5V

F1018A 250V

ACF700

5A 250V335V

Backlight pulse over 1000V p/p (54KhZ)

IC500

X400

IC407

The appearance of LD1 when the set is on appears to be lit dimly. However there is a small hole in the back panel frame and the

T-CON PWB that allows the backlight to make it appear lit.

Side Control Keys

MAIN PWB

P200Not Used

F1

IC900

IC807IC1201

IC304

IC1200IC202

LD8033.3V BCM

IC805OK LED

IC501

Pin 1 ~ 16

Q400E B

24Mhz

P2

3

1

7

5

11

9

15

13

19

17

23

21

4

2

8

6

12

10

16

14

20

18

24

22

10K

1st short either pin 9, 10, 11 or 12 (5V) to Pin 19 (PWR) using a 10K resistor.This turns on the power supply.2nd: To test the Backlights, jump Pin 20 (INV) to Pin 19 (PWR)Observe the Backlights.If normal, the backlights should turn on and off 4 times. Then they go off.If only the backlights light, (Right side or Left Side), confirm connectors are OK. If yes, panel defective.If no backlight activity, confirm the Fuse F700 has approx. 300V on both sides.If on one side, check fuse for open. If no 300V, replace Power Supply.If 300V present, observe the center leg on the left hand side of ballast transformer T701. Look for 58Khz pulse at 8.7V p/p. If yes, confirm connectors to backlight OK, if OK, then panel defective.If no pulse, replace the Power Supply.

ADIM Pin 21 can vary according to OSD Backlight setting. 0.9V 0% to 3.3V 100%*

P2 "SMPS" to P801 "Main PWB"

Pin Label STBY Run 1 16V 0V 16V3 Gnd Gnd Gnd5 12V 0V 11.8V7 Gnd Gnd Gnd9 5V 5V 5.15V11 5V 5V 5.15V13 Gnd Gnd Gnd15 Gnd Gnd Gnd17 ERR 3.19V 3.3V19 PWR 0V 2.86V21 *ADIM 0.1V 1.68V23 SEL 0V 3.2V

Pin Label STBY Run 2 16V 0V 16V4 Gnd Gnd Gnd6 12V 0V 11.8V8 Gnd Gnd Gnd10 5V 5.15V 5.15V12 5V 5.15V 5.15V14 Gnd Gnd Gnd16 Gnd Gnd Gnd18 ACD 4V 4.57V20 INV 0V 3.29V22 PDIM 0V 3.38V24 SYNC 0V 0V

Odd Pins Even Pins

IC109IC108 IC110

1 16

*Q901*Q902

*IC400

*IC802

*IC810

*IC405

*Grayed out components on the back

Function Pin Volts Function Pin Volts Name Function Pin Volts Function Pin VoltsIn from IC806 1 8.95V In 6,7,8,10 5V 1 0V Source C ST-5VOn/Off 2 3.3V Out 1,2,3,4,5 2.6V Out 2 3.3V Control B RL-ON (PWR)Out (+5V-TU) 3 5.0V On/Off 17 Power Control In 3 5V Gnd E 0Vn/c 4 0.0VGnd 5 0.0V

Function Pin Volts Function Pin VoltsIn 2 5V In 1 3.3VST-MICOM

Function Pin Volts Function Pin Volts Name Out 4 3.3V (A3.3V-BCM) Gnd 2 0.0VIn (+12V) 1 11.6V In 6,7,8,10 5V On/Off 1 Power Control-3.3V Out 3 Low to High to B Q400Gnd 2 0.0V Out 1,2,3,4,5 1.2VOut 3 9V On/Off 17 Power Control

Function Pin Volts Function Pin VoltsIn 3 3.3V from IC802 Source C 12V

Function Pin Volts Out 2 1.8V (+1.8V-NTP) Control B LVDS-Panel-Control1 0V Gnd 1 Gnd E 0V

Out 2 3.3V Function Pin Volts NameIn 3 5V In 3 5V ST_+5V

Out 2 3.3V Reset Function Pin Volts Function Pin VoltsGnd 1 0V Gnd In C ST-5V Source 1, 3 12V

Control B RL-ON (PWR) Control 2, 4 Low from Q902Gnd E 0V Output 5~8 12V

Q901 (On Back)12V LVDS On control to P900 Pins 1~4

IC404 uP 3.3V3.3VST-MICOM

IC404

IC806 IC8201.2V Switching Regulator A1.2V-BCM

Use L014 left side to test output

Q802 (On Back)5V Switch control to Q801

IC8072.6V Switching Regulator A2.6V-BCM

Use L801 left side to test outputUse any top pin of IC807 to test input

Use any top pin of IC820 to test input

9V Regulator

3.3V Regulator

Q801 (On Back)5V Switch

IC405 uP Reset (On Back)Reset by Charge of C431

IC802 (On Back)3.3V Regulator

Q902 (On Back)

FRONT SIDE OF MAIN PWB

IC810 (On Back)1.8V Switching Regulator +1.8V-NTP

3.3V Switching Regulator A3.3V-BCMIC805 (On Back)

IC800BACK SIDE OF MAIN PWB

5V Switching Regulator

12V LVDS control to Q901

Gnd

Gnd

0V

P100

See back side of page for Waveforms forP900 using SMTE Color bar as the Input.

Tuner Pin 16 SMTE Color bar In

uP5V Pin 3Video Pin 16Audio SIF Pin 14

TUNERBallastSection

*IC805

ResetBCM

P402

P401

Scope test point

Tweeter Tweeter

Pin 24 Pin 23

LG


42LG60

LVDS CABLE P900 FROM MAIN PWB TO CONTROL PWB P101 USING SMTP COLOR BAR INPUT

LAST TWO WAVEFORMS ARE FROM THE TUNER

Measurements +/- 5%

42LG60 :: WaveForms


42LG60

42LG60 :: maIn Board :: Bcm


42LG60

42LG60 :: maIn Board :: ddr memory


42LG60

42LG60 :: maIn Board :: maIn mIcroProcessor


42LG60

42LG60 :: maIn Board :: audIo Processor


42LG60

42LG60 :: maIn Board :: HdmI


42LG60

42LG60 :: maIn Board :: InterFace


42LG60

42LG60 :: maIn Board :: reGuLators


42LG60

42LG60 :: maIn Board :: Lvds/tuner


42LG60

42LG60 :: maIn Board :: audIo out

LG Flat TV 32LG40 Manual de Entrenamiento

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Transcript of LG Flat TV 32LG40 Manual de Entrenamiento