Post on 23-Oct-2014
42 Inch(Wide) PDP SVC Training Manual
LG Electronics / DND QA
Contents
Ⅰ. Usage/Service Points to be concerned
Ⅱ. Module formation & spec
Ⅲ. Screen defect diagnosis 1. 4/7 or 3/7 of screen is not displayed.
2. Screen by Data COF is not displayed.
3. one or more of Data COF IC have regular vertical lines.
4. Data COF IC unit error pattern
5. The screen by Scan COF is not displayed.
6. Regular- interval vertical line in the whole screen.
7. Vertical data copy
8. One or more vertical bars.
9. One or more horizontal bars.
10. Input signal pattern is displayed but the whole brightness of screen is dark.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-
discharge is partially occurred..
12. In full white pattern, the brightness is getting darker toward the center.
13. A specific brightness of one color is not clear.
Ⅳ. Non-picture defect diagnosis
Ⅴ. One Point Service Guide(42 Inch, 40 Inch)
LG Electronics/DND QA Gr3/79
Ⅰ. Usage/Service points to be concerned
SUGGGESTIONS
1. Static precaution Drive section circuit is C-MOS circuit, so to protect against static electricity, wear static-proof wrist band.
2. Cleaning when wiping panel, do not use liquid cleaner or other chemicals . Use a damp cloth for cleaning .
3. handling Color PDP uses high voltage(Max.500V). Be aware of electronic shock when handling PDP Unit and don’t touch drive circuit. and even driver circuit’s capacitor is turned off but charge still remains there, so to touch drive circuit, be sure to wait at least 1 minute.
4. Warning when connecting signal & Power Connector in operation do not touch connector while Color PDP is operating.
5. PDP servicing and guarantee Glass Panel and Drive Circuit section are linked and operating together. if you disassemble and assemble the product in your own hands , LGE is exempted from the guarantee of function, quality and etc.
6. Damage in still image Color PDP uses fluorescent material. The quality of PDP fluorescence by nature becomes deteriorated if using it in the same condition of CRT. To prevent this symptom, input full-screen regularly or use screensaver software. So do not display the still image for a long time.
7. Temperature & ventilation Color PDP’s Glass Panel section and Drive circuit section emit the heat so the temperature shall be kept under 40. the temperature of glass panel section is pretty high because built-in drive circuit emits the heat. PDP is operating with high voltage therefore be sure to keep it away from conductive objects.
8. Warning when handling Module be aware that PDP shall not be touched by metal or hard objects and shocked by the heat or mechanical force. be careful when disassembling or handling. be sure to wear glove for preventing injury when the glass’s broken.
Color PDP is a display device consisting of Panel section & Drive section. Panel section is composed of electrode, fluorescent substances ,dielectrics and gases, and drive section is a combination of electrical circuit section and PCB section. We call this concrete as PDP Module Ass’y and the following shows warning.
LG Electronics/DND QA Gr4/79
Service warning
1. One DVM ( FLUKE 87 or similar type )2. Digital Oscilloscope ( over 200MHZ )
Defect diagnosis tool
1. When inserting parts or PCB, fasten the lead line to terminal before soldering. 2. When inserting high- voltage resistance(metal oxide film resistance or metal film resistance), keep 10mm away from PCB 3. High-voltage or high-temperature parts shall be away from the lead line.4. This chassis is insulation(cold) chassis but for safety, it is better to use insulation trance. when servicing power board, be sure to use insulation trance.5. While PDP Module is in operation, do not connect or remove lines.
※ With COF or panel defect, report it to LGE PDP module service department.
LG Electronics/DND QA Gr5/79
Power : 220V 60HzPower consumption : 340W
1056
1259
635
693.5
220779.5
1379
114.8
281
82
91.5
aspect ratio: 16:9 screen size (H X V) : 920.1 X 518.4mm resolution : 852 X 480 (VGA) Cell Pitch (H X V) : 0.36 X 1.08 displayable colors (R,G,B) : 1,677K (256 X 256 X 256) brightness : 250 cd/ (w/o filter : 550 cd/ ) contrast ratio : 250:1 (w/o filter ; 700:1 )
color temperature : over 8500˚ K viewing angle : over 160˚ input signal : NTSC, HD, VGA ,SVGA Twin Picture : PC/AV PC input : D-SUB 15 Control : D-SUB25 / STB connection Video input : CVBS
S-Video input DVD input(Y,Cb,Cr)/R,L : Y/Y. Pb/Cb, Pr/Cr+R/L Audio input : R/L Power Cable : 3 심 (Ground terminal) Sound Output (Speaker) : R.L Out R,G,B input : D-SUB25 (RGBHV) : STB connection AC Input : 220V 60Hz
MN-42PZ10 Spec & Features
LG Electronics/DND QA Gr6/79
ITEMS SPECIFICATIONS(Tentative)Screen Size: 42 inch/ 106cm diagonalAspect Ratio: 16 :9 (width:height)Resolution: 852 x 480 Pixels(SD grade)Peak Brightness : typ.240cd/m² (with filter 60%)Contrast Ratio: 700:1(Dark Room & with filter 45%) Viewing Angle: 160° horizontally and verticallyDisplayable Colors: 16.7 millionWeight: kg (MNT), kg(D/stand), kg(spk.)x2Life: >25,000 hours (elapsed time to 50% of initial brightness)Dimensions(MNT) : 105.6cm wide, 63.4cm high, 8.2cm deep Input Terminals : RF terminal(PAL/SECAM/NTSC) (Set Top Box) Composite Video input(RCA) X 2, S-Video Audio L&R input(RCA) X 2 Component Video (Y,Pb,Pr) + R/L for DVD Component Video (Y,Pb,Pr)+ R/L for HDTV Stb. RGB-SUB 15 pin for HDTV Stb.(480p/720p/1080i) Analog RGB-SUB 15pin(PC VGA ~SVGA) Stereo Input for PC Audio Output Terminals : Analog RGB-SUB 15 pin(PC/DTV input bypass) (Set Top Box) Audio L&R(RCA) RGB-SUB 25 Pin for MNT(RGB/HV in & Control) Composite Video output + R/L outputInput Terminals : Analog RGB-SUB 15 pin (Compatible with PC (MNT) VGA ~SVGA, Compressed XGA) RGB-SUB 25 Pin for STB(RGB/HV in & Control) Component Video (Y,Pb,Pr) for DVD & DTV Stb. Composite Video input(PAL/SECAM/NTSC) Audio L&R input(RCA)X2Display Frequency : 15.73kHz to 60kHz horizontally, 50Hz to 75Hz(V)Picture : PIP(2Tuner:STB), Twin Picture, Digital Comb filter, Digital Video Enhancer(Jagging free ) Sound : A2 stereo, AVL, Dolby Virtual, 2x10WrmsRemote Control : Included(Unified)External Control : D-sub 25-pin connectorPower Source : 110-240V , 50/60 HzPower Consumption: 300 watts( with Max. Audio : 320W)
MN-42PZ10(42”W PDP MNT) Market : Korea / N_ America / S_America (2001. July ~)
Spec of Models
RN-BA11(3 System Multi STB) 430(W)X78(H)X280mm(D)
(Example of Desk Top Type)
LG Electronics/DND QA Gr7/79
DIGITAL SET TOP BOX ( SK-011T )
DIGITAL SET TOP BOX ( SK-010T )
ANALOG SET TOP BOX ( RN-BA10 )
ANALOG SET TOP BOX ( RN-BA11 )
MN-40PA10, MN-40PA10A only
MN-42PZ10 only
MN-40X3M , MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10
MN-40PA10, MN-40PA10A, MN-42PZ10, MN-60PZ10
All but MN-40X3M can be used
SET TOP BOX Compatible Model
Only related model can be used.
Only related model can be used
all Model can be connected but because of noise problem with internal fan, it is terminated.Be sure that MN-40X3M is not compatible with SK-011T
Separately : dedicated cable (AP-EA10)
separately : dedicated cable (AP-EA10)
PDP STB type & compatible model
LG Electronics/DND QA Gr8/79
P3 P2
VR2 VR1 VR1
Y SUS B/D ASSY CTRL B/D ASSY
ZSUS B/D ASSY
X RIGHT B/D ASSY
Label
P2
P100
P300
P1
X LEFT B/D ASS’Y
P4
P6
P5
Y D
RV
Up
per
B/D
AS
SY
Y D
RV
Low
er B
/D A
SS
Y
P1
P2
Ⅱ. Module diagram & spec
PART NO. product name st andard1 6871QTH003B PWB( PCB) ASSY ZCNT TOP B/ D ASSY2 6871QZH002B PWB( PCB) ASSY ZSUS B/ D ASSY 3 6871QTH004B PWB( PCB) ASSY ZCNT BOTTOM B/ D ASSY 4 6871QLH012A PWB( PCB) ASSY X LEFT BOTTOM B/ D ASSY5 6871QRH010A PWB( PCB) ASSY X RI GHT BOTTOM B/ D ASSY6 6871QDP016B PWB( PCB) ASSY YDRV Upper B/ D ASSY 7 6871QDP017B PWB( PCB) ASSY YDRV Lower B/ D ASSY 8 6871QYH015A PWB( PCB) ASSY YSUS B/ D ASSY
YDRV B/D ASSY
ZCNT TOP B/D ASSY
ZCNT BOTTOM B/D ASSY
EXTERNAL CABLE CONNECTI ONconnect or suppl y si gnal
P1~P2[ X B/ D] 5V, 15V, VAP3[ Y SUS B/ D] VSC, VSETUPP2[ Y SUS B/ D] 5V, 15V, VSP1[ Z SUS B/ D] 5V, 15V, VSP300[ CTRL B/ D] 5VP100[ CTRL B/ D] VI DEO SI GNAL
LG Electronics/DND QA Gr9/79
Y- Board
Controller Board
Z- Board
CN1
CN2
Local key
EMI Filter
VSC Board
POWER Board
X – Board ( R )X – Board ( L )
Y-
Driv
eY
- D
rive
Main Power
LG Electronics/DND QA Gr10/79
STBSTB
PCPC
VideoVideo
DVDDVD
LA7222LA7222
VPC3230VPC3230 SDA9410SDA9410 CXA2101CXA2101 THS8083THS8083
CXA2022SCXA2022SMX88L284MX88L284 Buffer
HC541BufferHC541
LA4282LA4282
MICOMCXP750010
HC74HC74
PD
P
MP
DU
LE
2M-SDRAM2M-SDRAM
Monitor Block diagram
LG Electronics/DND QA Gr11/79
MICOM
EEPROMX2416P
VIDEO SWITCH
(M52758FP)
AUDIO
L
RAUDIO AMPLA4282(L&R)
5
5
RGBHV
RGBHV 3
H/VSOG
COLOR DECODER
(VPC3230D)
DEINTERLACE(FLI2200)
MEMORY(4M-BYTE)
ENHANCER(FLI2220) COLOR CONTROL
&VIDEO SWITCH
(CXA2101Q)
3Y,Pb,Pr(STB)3Y,Pb,Pr(MNT)
A/D CONVERTER
(CXA3516R) SCALER
(JAG200)
MEMORY (6M-BYTE)
EPLD
(GEN. CLAMP)
Buffer(74F574 x 4)
H
V
Clamp
2H/V
H
H
V
2PLLH/CLK
5
H/V/CLK/HBLK/VBLK
4
H/V/DE/CLK
DISP_EN
5
RGBHV
3RGB
3RGB
5Y,U,V,H,V
SoundProcessor
(MSP3401G)
2H/V
MONOSTALE MULTIBIB.
SOG_OUT CLAMP_AD
PORT EXP(M62320X3)
ROM(AT29C010)
(74HCT373)
YCbCr/YPbPr
CVBS
2
YUV
41P8
4
H/V/FIELD/LLC1
MN-42PZ10 VSC(JAG200 & FLI2200) Block Diagram
LG Electronics/DND QA Gr12/79
TUNER.1
외부입력 1
CXA2069Q
A/V SWV, L/R
V, L/R
S-VHSY / C
※ AUDIO 공용
MSP3401G
SoundProcessor
2’nd SiF
L/R(tv)
DVD/DTV
(RCA JACK)
VPC3230D(MAIN)
VidoProessor
Y,Cr,Cb (DVD)
DVD_Y
VPC3230D(SUB)Video
Proessor
MS81V04160FRAME
MEMORY
PC L / R
Y,Pb,Pr(DTV)
Y,Pb,Pr(DTV)
RGB(PC)
CVBS
RGB
M52758FPRGB/YUV
S/W
DCF
RE
WE
RN-BA11(Tuner Receiver) Block - Diagram RN-BA11(Tuner Receiver) Block - Diagram Ro
Lo
Y/C외부입력 2
MNT_OUT
CVBS
Y/C
OPTION
TUNER.2
TV (M)
TV (S)L/R(tv)
Y/C
M52756FPRGB/YUV
S/W
RGB (DTV)
RGB(OSD)
LGTV1001DRP
CXA2119MS/W
+
YUV
L/R
LG Electronics/DND QA Gr13/79
Connecting 25 Pin cable(when connecting 25 Pin cable,Connect external equipment to STB)
Product back & monitor in/output section
LG Electronics/DND QA Gr14/79
Power BoardY-Drive (TOP)
Y-Board
VSC Board
Y-Drive (Bottom)
Z-Board
Controller Board
EMI Filter
Connection diagram (back cover’s open)
LG Electronics/DND QA Gr15/79
BACK COVER
POWER BOARDVSC BOARD EMI Filter
Exploded view (Back Cover, VSC, EMI, Power )
LG Electronics/DND QA Gr16/79
PANEL
Y-BOARD
Z-BOARD
CONTROL BOARD
X-BOARD
X-BOARD
Y-Drive BOARD
Y-Drive BOARD
Exploded view (Module)
LG Electronics/DND QA Gr17/79
VSC Board(Front) EMI Filter
Power Board Z- BoardY-Board Control Board(Back)Y-Drive Board (Top)
Y-Drive Board
Main Power Switch
Parts (back covers open)
LG Electronics/DND QA Gr18/79
X-Board ( Right) X-Board ( Left )
Control Board Z-BoardY-BoardY-Drive Board
EMI Filter & VSC Board are separated
LG Electronics/DND QA Gr19/79
Power well power Board-Korean market Murata Power Board
Power Board ( SMPS )
LG Electronics/DND QA Gr20/79
1. The 4/7 or 3/7 of screen is not displayed. 1) Check the X B/D power connector.
2) Check the connector between CTRL B/D and X B/D.
3) Replace the X B/D.
※ relations between screen and X B/D
screen X B/D
left 4/7 of screen Right X B/D
right 3/7 of screen Left X B/D
※ type
i) screen’s left(4/7) ii) Screen’s right(3/7)
Non-displaying partDisplaying part
Ⅲ. Screen defect diagnosis
LG Electronics/DND QA Gr21/79
2. No image by Data COF. (the case one Data COF is totally or partially not displayed included)
1) It is mainly caused by related Data COF and X B/D connection error.
2) Check the connector between that Data COF & X B/D.
3) When Data COF has a defect, replace the related X B/D. ※ examples of screen display type ( beside the below, any out of 7 Data COF can be occurred. )
partially displayingok
Non-image
Set pattern( GND ) to ANODE, Pattern (resistance joint part ) to CATHOD,Test diode forward and backward.Measure resistance value.(10Ω)③
GNDresistance
※ Data COF IC test method
LG Electronics/DND QA Gr22/79
3. Data COF IC unit error
1) As pictures below, this is caused by the clock error of Data COF IC
2) With <case 1>, <case 2>, <case 3>, check Data COF connector and replace the X B/D.
3) With <case 4>, <case 5>, check the connector between CTRL B/D & X B/D and replace X B/D or CTRL B/D.
※ Cases
Two every-second IC error in one
<case 1>
4 IC errors in one COF
<case 2>
Data COF IC unit error in the whole X B/D
<case 3>
Data COF IC unit error in the whole screen.
<case 4>
One IC error in one COF
<case 5>
LG Electronics/DND QA Gr23/79
※ casePartial error or total error with One or more ICs
defect.
4. Regular vertical line with one or more Data COF IC 1) Regular vertical line with one Data COF IC is mainly caused by X B/D output terminal buffer’s output error. When two Data COF ICs have regular
vertical lines, it means the data transfer from Controller B/D to X B/D has an error.
2) Check the related X B/D connector.
3) Replace that X B/D or CTRL B/D
screen X B/D
left 4/7 of bottom screen Right X B/D
right 3/7 of bottom screen Left X B/D
※ relation between screen & X B/D
LG Electronics/DND QA Gr24/79
5. The screen by Scan FFC is not displayed
1) It is mainly caused by the bad connection between Scan FFC & Y B/D.
2) Check the related connector between Scan COF & Y B/D.
3) When Scan IC has a defect, replace the related Y DRV B/D.
※ case 1/8 of the screen
total or partial non- image
※ SCAN IC check
Set Vpp Pin to ANODE, GND pin to CATHOD and test diode forward and backward.
OK
LG Electronics/DND QA Gr25/79
6. Regular vertical lines in the whole screen. (mainly in one specific color, regular line is flicking) 1) This problem is related to CONTROL B/D.
2) Replace CONTROL B/D
※case
Regular vertical lines in the whole screen
7. Vertical Data copy 1) It possibly happens when scan wave does not form properly.
2) Replace Y DRVB/D or Y SUS B/D
※ case
<pattern supposed to display>
<case2 : partial- top copy> <case 3 : partial- bottom copy> <case 4 : total copy>
<case 1 : total copy>
LG Electronics/DND QA Gr26/79
8. One or more vertical lines in the screen.
1) Irregular vertical line is not related to Controller B/D or X B/D.
2) It is mainly caused by the followings open(or short).
- Panel itself defect
- DATA COF FPC attached to panel is open or short.
- DATA COF attached to panel itself defect
3) Replace module
※ caseThere are several types.
Several lines in ¼ area.
It can be seen on the both side, right and left.
The area is sometimes over ¼.
9. One or more horizontal lines in the screen. 1) Irregular borizontal line is not related to Controller B/D or Y B/D.
2) It is mainly caused by the followings open(or short).
- Panel itself defect
- SCAN FPC attached to panel is open or short.
- SCAN IC attached to panel itself defect
3) Replace Y DRV B/D
※ case
Not always like this.
There can be several horizontal lines
LG Electronics/DND QA Gr27/79
10. Input signal pattern is displayed but the whole brightness of the screen is dark. 1) It happens when Z B/D is not operating well.
2) Check whether Z B/D’s power connector is plugged .
3) Check whether the connector between Controller B/D & Z B/D is plugged.
4) Replace Controller B/D or Z B/D.
11. In full white pattern, foreign color is displayed or in full black pattern, mis-discharge
is partially occurred. 1) Check the slope of Y B/D set up, set down waveform.
2) Check the slope of Z B/D’s ramp waveform
3) Measure each B/D’s output waveform by over 200MHz oscilloscope and compare it to the below picture.
it is possible to control Y B/D’s setup slope by adjustinng VR2, setdown slope by VR1 and Z B/D’s ramp slope by VR1..
- Y B/D measurement point : TP ( Connector P4 36 pin )
- Z B/D measurement point : panel connection part ( SUS_OUT )
setup
setdown230s
25s
230VVsetup
175VVs
Y output voltage wave
175VVs
15s
20s
Z RAMP voltage wave
0V
LG Electronics/DND QA Gr28/79
13. A specific brightness of one color is not clear.
1) Check CTRL B/D’s input signal connector.
2) Replace CTRL B/D.
12. In full white pattern, the brightness is getting darker toward the center. 1) It happens with Z B/D’s ramp waveform
2) Check the connection between CTRL B/D and Z B/D’s connection cable.
3) Replace Z B/D.
※ case
LG Electronics/DND QA Gr29/79
Non- image or same symptom when power off or black pattern. 1) Check CTRL B/D’s LED(D1~D4).
2) Check the power or signal cable input into CTRL B/D.
3) Check X B/D, Y B/D and Z B/D’s power connector.
4) Check the connector between CTRL B/D and X B/D, Y B/D, Z B/D respectively.
5) Measure each X, Y, Z B/D’s output waveform with over 200MHz oscilloscope and compare it to the below picture to detect the defect
and replace that.
- Y B/D measurement point : TP ( Connector P4 36 pin )
- Z B/D measurement point : panel connection part ( SUS_OUT )
- X B/D measurement point : L1(RIGHT), L2(LEFT BOTTOM)
< A: Y B/D output waveform - 1 FRAME >< B: Y B/D output waveform - 1 SF >
1Frame(16.7ms)
Ⅳ. Non-picture Defect diagnosis.
5) Test scan(Y) IC.
6) Test data(X) COF IC.
7) Replace CTRL B/D.
< B: Y B/D output waveform - 2 SF(non-Setup SF) >
6)Test scan(Y) IC.7)Test data(X) COF IC8)Replace CTRL B/D.
LG Electronics/DND QA Gr30/79
< B: Y B/D output waveform - 7~12 SF(SE) >
< B: Z B/D output waveform - 1SF >
< A: Z B/D output waveform - 1Frame >
< A: Y B/D output waveform - 1Frame >
< X B/D output waveform - 1 FRAME >
< X B/D output waveform - amplification >
< X B/D output waveform - 1 SF >
LG Electronics/DND QA Gr31/79
P6
P4
Rework should be done
Y-Driver Board
Y-Board
4242”” PDP Flicker and PDP Flicker and No Raster TroubleshootingNo Raster Troubleshooting Guide Guide
cause : bad connection between Y-Board # 1, 2 drive board Connector pin
Ⅴ. One Point Service Guide 42 Inch
LG Electronics/DND QA Gr32/79
amplified amplified
① : outside Leg : inside Leg②
•P 6, P 4 both are the first pin, when wiring, it should be done as picture shown. (bend the wire to Y-Driver B/D not to Y-B/D . If not there can be noise)
•Don’t be confused with Pin number
•Improved since Dec,2001.
P 4 ①
②
②
①
①
②①
②
①②
②①
P 6
LG Electronics/DND QA Gr33/79
②
①②
②①
①
②
①
Be sure not to misconnect the line.See the picture precisely and then connect jump wire at the exact point
LG Electronics/DND QA Gr34/79
X CANVAS X CAVBAS
Intermittent no-image/image error while watching
The screen is intermittently disappeared . LED is green screen is distorted weiderly (happened 2 a day)
normal
cause : bad connection between Y-Board and #1, 2 pin of Y-Drive Board Connector
troubleshooting : connect bad linking between Y-Board & Y-Drive with jump wire (all 4 parts)
see working instruction(revised since Dec,2001. 1)
CANVASX
LG Electronics/DND QA Gr35/79
X CANVAS
normal
CANVASX
No Power ( in ST-BY mode, but no LED)
Check the power supply & main power S/W on
Check EMI board fuse (check the rated capacity )
No Power
Fuse 15 A
Be sure to use rated fuse.
LG Electronics/DND QA Gr36/79
X CAVBAS
normal
CANVASX
when Power’s on, after 2 ~ 3 sec, it’s off ( LED changing green into red )
CHECK : remove STB and operate monitor individually. (check STB defect or Monitor defect )
When using ANALOG STB, check STB only MN-42PZ10 only STB : RN-BA11
Remove each Board’s power supply connector and check the power is off.When the power is not off,replace the related board.
No Raster
LG Electronics/DND QA Gr37/79
X CANVAS
normal
CANVASX
no picture (LED’s green)
Core checkpoint : remove STB and operate monitor individually. (check whether STB’s a defect or monitor’s one)
No Picture
With monitor defect, check VSC and then Controller Board.
Troubleshooting : replace VSC Board
LG Electronics/DND QA Gr38/79
X CANVAS
normal
CANVASX
no image (LED’s green)
Cause : Y-Drive ( Bottom ) defect
Troubleshooting : Y-Drive (lower part) replacement
Address Bar ( Horizontal Bar )
Y-Drive Board ( Bottom )
This problem is shown in the bottom of screen,So it is caused by Y-Drive
LG Electronics/DND QA Gr39/79
X CANVAS
normal
CANVASX
no image (LED’s green)
Address Bar ( Horizontal Bar )
Y-Drive Board ( Top )
Cause : Y-Drive Board (upper part) defect
Troubleshooting : Y-Drive Board replacement
LG Electronics/DND QA Gr40/79
X CANVAS
normal
CANVASX
no image (LED’s green)
PD501 Connector
No Picture
cause : PD-501 Connector contact point defect
troubleshooting : PD-501 Connector replacement
(with PD-501 Connector contact point defect,Various defect symptoms can be seen)
LG Electronics/DND QA Gr41/79
X CANVAS
normal
CANVASX
normal picture with high frequency noise (“bee”)
High frequency noise (“Bee” sound)
C8178 0.22uF electrolytic capacitor insertion
Open C8139 right lead and then wire R8164 right lead
Power (SMPS) Board
1. C8178 0.22 /50V add2. Open C8139 right lead, and then connect it to R8164 right lead.
Improved since Nov,2001
SMPS is supposed to operatewith high frequency sosmall noise is not considered as a defect.
#. Slight noise is not a defect and write down explanation
LG Electronics/DND QA Gr42/79
X CANVAS
normal
CANVASX
No picture in right- 2/5 area
No picture in the right- 2/5 area
X-Board ( Left ) power supply check
X-Board ( Left )Connector check
X-Board ( Left ) replacement
LG Electronics/DND QA Gr43/79
X CANVAS
normal
CANVASX
Address Bar (Vertical )
stripe in right-2/5 area
X-Board ( Left ) power supply check
X-Board ( Left ) Connector check
X-Board ( Left ) replacement
LG Electronics/DND QA Gr44/79
X CANVAS
normal
CANVASX
X-Board ( Right ) power supply check
X-Board ( Right )Connector check
X-Board ( Right ) replacement
left 3/5 of screen with vertical stripes
No picture in left 3/5 of the screen
LG Electronics/DND QA Gr45/79
X CANVAS
normal
CANVASX
X-Board ( Right ) power supply check
X-Board ( Right )Connector check
X-Board ( Right ) replacement
Address Bar (Vertical )
left 3/5 of screen with vertical stripes.
LG Electronics/DND QA Gr46/79
X CANVAS
normal
CANVASX
no Red ( B or G )
Be sure not to bend it by force or internal Insulated conductor can be down.
Test Monitor individually.If detect a problem with monitor, check VSC Board.
If it has a problem with STB connecting, focus on 25 Pin.
Be sure not to connect 5 Pin (AP-EA10) by force
25 Pin Cable P/No : GVZ AP-EA10
No Red
LG Electronics/DND QA Gr47/79
Lift up the right and left of X-BOARD CONNECTOR. Lift up X-BOARD CONNECTOR and separate COP CONNECTOR by pulling up.
When you handle COF CONNECTOR, don’t pressure. First release LOCK and separate.If COF CONNECTOR is damaged, you should replace MODULE ASS’Y. So, be aware of this!!
1) X - Board COF Connector separation
When you exchange X-Board, first you should separate COF Connector. Be careful to handle it.COF Connector is attached to Module. When COF Connector is broken, Module ASS’Y must be replaced a new one.
When you exchange X-Board, first you should separate COF Connector. Be careful to handle it.COF Connector is attached to Module. When COF Connector is broken, Module ASS’Y must be replaced a new one.
WarningWarning
COF Connector
42 Inch
LG Electronics/DND QA Gr48/79
Lift up each edge of left/right. Lifted condition
2) X - Board Connector separation
It’s easy to separate it by releasing Connector Lock .
Do not pressure or it can be hurt. When LOCK is hurt, replace a new X-BOARD
WarningWarning
Be careful to handle LOCK or it can be broken. When LOCK is broken, replace a new X-BOARD.
LG Electronics/DND QA Gr49/79
Pull the white LOCK as shown in arrow
Pull the white LOCK as shown in arrow.
Separate COF CONNECTOR by pulling in the left.
3) Y - Board COF Connector separation
WarningWarning
Be careful to handle LOCK and COF Connector. When LOCK part is damaged, you should replacea new Y-Board. In case of COF Connector, Module Assembly.
LG Electronics/DND QA Gr50/79
4) Z - Board COF Connector separation
Separate the fixed Screw of Z-Board.Pull out Lock as shown in arrow.
Condition in Lock part is pulled Pull COF Connector as shown in arrow.
It’s easy to separate COF on conditionthat Z-Board Screw is separated. In case Z-Board is assembled, it’s reallyhard to separate.
Be careful not to tear COF Connector.If COF Connector is torn, replace a new Module Assembly
WarningWarning COF Connector
LG Electronics/DND QA Gr51/79
Push LOCK and pull out
PUSH PUSH PUSH
5) Connector separation Guide
PUSH PUSH PULL
LG Electronics/DND QA Gr52/79
6) Control Board & VSC Board Connector
LG Electronics/DND QA Gr53/79
Be sealed up after gas injection
Be careful to handle the sealed-up part after gas injection. If it is broken, the gas escapes. So, replace the Module.
7) Gas injection (Sealing up) condition
WarningWarning
Be sealed up after gas injection
LG Electronics/DND QA Gr54/79
Power is On and off 2~3 minutes.(Protection)
Power is On and off 2~3 minutes.(Protection)
P301 Connector Open Check.P301 Connector Open Check. X - Board Top Right Change.X - Board Top Right Change.
P302 Connector Open CheckP302 Connector Open Check X - Board Top Left Change.X - Board Top Left Change.
P303 Connector Open CheckP303 Connector Open Check
P304 Connector Open CheckP304 Connector Open Check
P102 Connector Open CheckP102 Connector Open Check
X - Board Bottom Right Change.X - Board Bottom Right Change.
X - Board Bottom Left Change.X - Board Bottom Left Change.
Z - Board Change.Z - Board Change.
P3, P2 Connector Open CheckP3, P2 Connector Open Check Y - Board Change.Y - Board Change.
P005, P003 Connector Open CheckP005, P003 Connector Open Check
P006 Connector Open CheckP006 Connector Open Check
VSC- Board Change.VSC- Board Change.
VSC - Board Change.Sound Output IC Short Check
VSC - Board Change.Sound Output IC Short Check
Power Board ChangePower Board Change
OK
OK
OK
OK
OK
OK
OK
OKPROTECT operation;
When the load voltage is short.
When each voltage doesn’t work (in general)
PROTECT operation;
When the load voltage is short.
When each voltage doesn’t work (in general)
8) Power off in 2 ~ 3 minutes(Protection)
LG Electronics/DND QA Gr55/79
L813 Cold Solder
Check Check
Open the Connector connecting to each Board to check the power is off.if each Board is same, check the Power Board and voltage.
Symptom : As soon as the power on, it’s off in 2 - 3minutes. (PROTECT operation)Cause : No VS voltage L813 Coil cold soldering.
9) Power off in 2 ~ 3 minutes(Protection)
LG Electronics/DND QA Gr56/79
MP-40PA10 uses 4 board such as left,right, top and bottom.Divide the screen in 4 and once you see ADD BAR check COF CONNECTORbetween MODULE and X-BOARD.If there is no defect in COF CONNECTOR replace X-BOARD.But the problem still remains and check the connector between X-BOARD andCONTROL BOARD. And if you can’t find defect, check CONTROL.
HEATRUN : WHITE
Press the ADJ KEY and check the position of add bar by changing WHITE orRED or BLUE or GREEN
Top Right Top Left
Bottom Right Bottom Left
10) ADD BAR inspection and repair
LG Electronics/DND QA Gr57/79
Symptom : B color 1 Address line OpenCause : Dented COF
COF is dented
11) One Point Service Guide
LG Electronics/DND QA Gr58/79
Symptom : Inferior R Address color Cause : Inferior DATA output by cold soldering 16 pin of IC14 in X-L-TOP ( Normal waveform after tearing off IC Pin)Countermeasure : Replace X-L-TOP board.
IC14
Cold Soldering
Abnormal waveform by cold soldering
Normal waveform after tearing off IC pin
LG Electronics/DND QA Gr59/79
CheckCheck
The blue spreads on the screen (Mis-discharge) and power off in 2 ~ 3 seconds.If you turn on again, it will be same problem.
Symptom Causes Countermeasure
If 15V line voltage reduces below 14V,Mis-discharge occurs and power off because of protection circuit.
Replace PSU(Power Supply Unit)and defective X-Board.
If when Power on, screen shows like above and turn off in 2 seconds, check if turning off or not by disconnectingall X & Y boards.
Defective X-Board
LG Electronics/DND QA Gr60/79
Check Check
The top left part of screen is broken(Top Right X-BOARD)
Symptom Cause Countermeasure
No 5V supply to Top rightX-Board.
Connect 5V line
Check Top right X-BOARD 5V.(If 0V, it happens)
Check 5V line from SMPS to X-BOARD.
LG Electronics/DND QA Gr61/79
CheckCheck
Pinkish screen in the top left.(Top right X-BOARD)
Symptom Cause Countermeasure
No Va(70V) supply to Top right X-Board.
Connect 70V line
Check Top right X-BOARD Va(70V).(If 0V, it happens)
Check 70V(Va) line from SMPS to X-BOARD.
LG Electronics/DND QA Gr62/79
CheckCheck
The 3/5 top left in the screen is blank(Top Right X-BOARD)
Symptom Cause Countermeasure
Check Top right X-BOARD 12V.( If 0V, it happens )
Check Top right X-BOARD Va(70V).(If 0V, it happens)
Check 12V & 70V(Va) line from SMPS to X-BOARD.
No 12V supply to Top rightX-Board.
No Va(70V) supply to Top right X-Board.
Connect 12V line
Connect 70V line
LG Electronics/DND QA Gr63/79
CheckCheck
The 3/5 top right of the screen is blank. (Top left X-BOARD)
Symptom Cause Countermeasure
No 12V supply to Top leftX-Board.
No Va(70V) supply to Top left X-Board.
Connect 12V line
Connect 70V line
Check Top left X-BOARD 12V.( If 0V, it happens )
Check Top left X-BOARD Va(70V).(If 0V, it happens)
Check 12V & Va(70V) line from SMPS to X-BOARD.
LG Electronics/DND QA Gr64/79
CheckCheck
Pinkish screen in the 1/5 top right (Top left X-BOARD)
P1 COF connector on Top leftX-Board is open.
Reassemble it
Check the contact point and Locking of P1 on Top left X-BOARD.
Symptom Cause Countermeasure
LG Electronics/DND QA Gr65/79
CheckCheck
The 3/5 bottom left of screen is broken. (BOTTOM RIGHT X-BOARD)
Symptom Cause Countermeasure
No 5V supply to bottom rightX-Board.
Connect 5V line
Check Bottom right X-BOARD 5V.( If 0V, it happens )
Check 5V line from SMPS to X-BOARD.
LG Electronics/DND QA Gr66/79
CheckCheck
The 3/5 bottom left of the screen is Blank. (Bottom Right X-BOARD)
Symptom Cause Countermeasure
Check Bottom right X-BOARD 12V.( If 0V, it happens )
Check 12V line from SMPS to X-BOARD.
No 12V supply to bottom rightX-Board.
No Va(70V) supply to bottom right X-Board.
Connect 12V line
LG Electronics/DND QA Gr67/79
CheckCheck
The 2/5 right of the screen is broken. (Bottom left X-BOARD)
Symptom Cause Countermeasure
Check Bottom left X-BOARD 5V.( If 0V, it happens )
Check 5V line from SMPS to X-BOARD.
No 5V supply to bottom leftX-Board.
Connect 5V line
LG Electronics/DND QA Gr68/79
CheckCheck
The 2/5 right part of the screen is blank. (Bottom left X-BOARD )
No 12V supply to bottom leftX-Board.
Connect 12V line
Check Bottom left X-BOARD 12V.( If 0V, it happens )
Check 12V line from SMPS to X-BOARD.
Symptom Cause Countermeasure
LG Electronics/DND QA Gr69/79
CheckCheck
ADDRESS bar appears in the right bottom of the screen. (X-BOARD BOTTOM LEFT)
The connecting of X-Board bottomleft connector is bad.
Reassemble it.
Check connecting of the connector of bottom left X-BOARD.
Reassemble it.
X-BOARD BOTTOM LEFT CONNECTOROPEN.
Symptom Cause Countermeasure
LG Electronics/DND QA Gr70/79
Examples
LG Electronics/DND QA Gr71/79
CheckCheck
Screen is divided in top and bottom, and vertical barappears.
Connector(P13) is OPEN or Connecting condition is bad
Reassemble P13.
P13 CONNECTOR contact point inferior CHECK.
P13 CONNECTOR SIGNAL CHEK.
P13 CONNECTOR
Symptom Cause Countermeasure
LG Electronics/DND QA Gr72/79
CheckCheck
Screen is broken and has the vertical/horizontal bar.
VSC Board Connector is Open. Reassemble VSC BoardConnector
Check the connector connecting
Reassemble the Connector
Symptom Cause Countermeasure
LG Electronics/DND QA Gr73/79
CheckCheck
The screen is bluish(Mosaic screen)
Loose VSC Board Connector Reassemble VSC BOARDConnector
Check the connection condition of the Connector.
Reassemble the Connector.
Symptom Cause Countermeasure
LG Electronics/DND QA Gr74/79
CheckCheck
The mosaic appears in the screen when it connects to VIDEO Input.(The sensibility of Y-signal is low.)When connected to Component Input, it is O.K.
Bad IC203 Replace IC203(VPC3230D)
Check if X201 on VSC board oscillates.Check Video In/Out of IC203 on VSC board.
IC201(VPC3230D)Decoder IC
Symptom Cause Countermeasure
LG Electronics/DND QA Gr75/79
IC201(VPC3230D) Decoder is inferior
Examples
LG Electronics/DND QA Gr76/79
CheckCheck
Noise with division of colors
Bad Connector connectingControl Board and VSC B/D.
Contact point and signal condition of Connector Control Board and VSC Board.
Abnormal Normal
Bad Connector
SymptomCause
Countermeasure
Change the Connector
LG Electronics/DND QA Gr77/79
Name No signal Vertical Bar
Symptom Cause and Countermeasure
Realization
1.Cause : Bad IC2 (DA1)
8cm
When ASIC Chip(IC2 DA1 LGD4001) on Control Board getshigh temperature, you can observe it(In normal temperature it’s O.K. )
IC2 DA1(Data Arrange) No.162 Pin output is changing depending on the temperature. abnormal X-B’d Buffer IC ⇒* Room temperature : 2.5V Output (Normal Pin = over 2.8V)* Heated : 1.5V Output(Normal Pin = 2.7V )
⇒ Bad IC2 (DA1)
< Waveform of normal pin>
heated
< Waveform of abnormal pin >
heated
DA1
Buffer
DA1
Buffer
Buffer(74ACT541) waveform abnormally narrows. →In this case, it is impossible for Flip Flop(74AC574) on X B/D to read data.
2. Countermeasure : Replace IC2
LG Electronics/DND QA Gr78/79
Name Add Open (Green 1 Line)
Symptom Cause and Countermeasure
1.cause: Add. COF Drive IC inferior
Normal Line Data waveform Open Line Data output waveform
the output of inferior line less than that of the normal LineAdd. COF Drive IC inferior
COF inspection 검사기 : 24V Open check (normal 50V)
Add. COF Drive IC
LG Electronics/DND QA Gr79/79
Name Vertical bar when Power off/on(Mis-discharge)
Symptom Cause and Countermeasure
Realization
1.PDP Power on Mode external input (regardless of wire/wireless signal but it’s easy to reenact in wireless signal)2. Remove Power Cord (Power’s off)3.after about 20minutes, insert Power cord (automatically the Power’s on and the vertical bar is shown as above)
1.Cause : Control board malfunctions when Power off/on.
2.Countermeasure: Change some parts on Control board.
3.Changing parts : A32_CTRL_03 B/D (Marked on PCB) -.R14,17,18,21 : 330 ==> 4.7K (Chip Resistor) -.R15,16,19,20 : 22K ==> 4.7K (Chip Resistor) -.C504, 505 : 0.1uF / 50V add (Chip Capacitor)
Control board