UOC III – (29 G-III Chassis)

SERVICE MANUALSERVICE MANUALCOLOUR TELEVISION

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CONTENTS1. safety precautions………………………………………………………………………………………3

2. block diagram

and PHILIPS UOC functional difference between the various IC versions ………………….4

3． Replacement of memory IC……………………………………………………………………………7

4． Service adjustment……………………………………………………………………………………...7

5． ICs functional description………………………………………………………………………………11

6． Test point waveform………………………………………………………………………………….…15

7． All ICs/transistors voltages…………………………………………………………………………….16

8． Purity / convergence adjustment……………………………………………………………………..17

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SAFETY PRECAUTIONS1. The design of this product contains special hardware, many

circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will void the manufacturer’s warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components having such features are identified by shading on the schematics and by ( ！ ) on the parts list in Service manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards

4. Don’t short between the LIVE side ground and ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing. Some model’s power circuit is partly different in the GND. The difference of the GND is shown by the LIVE: ( ) side GND, ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don’t short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure with a measuring apparatus (oscilloscope etc.) the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time. If above note will not be kept, a fuse or any parts will be broken.

5. If any repair has been made to the chassis, it is recommended that the B1 setting should be checked or adjusted (See ADJUSTMENT OF B1 POWER SUPPLY).

6. The high voltage applied to the picture tube must conform with that specified in Service manual. Excessive high voltage can cause an increase in X-Ray emission, arcing and possible component damage, therefore operation under excessive high voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high voltage harness, poor soldering, etc.). To maintain the proper minimum level of soft X-Ray emission, components in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved by the manufacturer of the complete product.

7. Do not check high voltage by drawing an arc. Use a high voltage meter or a high voltage probe with a VTVM. Discharge the picture tube before attempting meter connection, by connecting a clip lead to the ground frame and connecting the other end of the lead through a 10kΩ 2W resitor to the anode button.

8. When service is required, observe the original lead dress. Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the

9. manufacturer’s replacement components.

10. Isolation Check(Safety for Electrical Shock Hazard)After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screwheads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

11. The surface of the TV screen is coated with a thin film which can easily be damaged. Be very careful with it when handle the TV.　Should the TV screen become soiled, wipe it with a soft dry cloth. Never rub it forcefully. Never use any cleaner or detergent on it.

(1) Dielectric Strength TestThe isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second.(…Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a periode of one second.)This method of test requires a test equipment not generally found in the service trade.

(2) Leakage Current CheckPlug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a “Leakage Current Tester”, measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.).However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).●Alternate Check MethodPlug the AC line cord directly into the AC outlet ( do not use a line isolation transformer during this check.). Use an AC voltmeter having 1000 ohms per volt or more sensitivity in the following manner. Connect a 1500Ω 10W resistor paralleled by a 0.15μF AC-type capacitor between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.).However, in tropical area, this must not exceed 0.3V AC (r.m.s.).This corresponds to 0.2mA AC (r.m.s.)

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2 TV Block diagram

SAWF(VIF)

SAWF(SIF)

TUNER(FS)

UOC-III

RFCPT

Video AMP.(TDA6107AJF)(TDA6108AJF)

RGBIF

SIF2SIF1

VIF1VIF2 RGB

SCAVEMBLKIN

SCAVEM

EEPROM24C16

I2C BUS

FRAME DEF.(TDA8359)

VDRAVDRBVguard

Line Def.+EW

H.driveEW.DriveEHT info

Audio Amp.TDA7269

Audio RAudio L

POWER

STB

SPEAKERR

242529 30

846585/86/87

2223

13

672132

616010

7

108/109

MainSupply

Vaux

AV1/S1 AV2/S2

AV3 DVD Monitor-

Out

Headphone-Out

70/71/72

3. UOC-III :The UOCIII series combines the functions of a Video Signal Processor (VSP) together with a FLASH embedded TEXT/Control/Graphics -Controller (TCG -Controller)

The UOCIII series consists of the following 3 basic concepts: Stereo versions . These versions contain the TV processor with a stereo audio selector, the TCG m-Controller, the multi-standard

stereo or BTSC decoder, the digital sound processing circuit and the digital video processing circuit. Options are the adaptive digital PAL/NTSC comb filter and a teletext decoder with 10 page text memory.

AV stereo versions. These versions contain the TV processor with stereo audio selector and the TCG m-Controller. Options are the digital sound processing circuit, the digital video processing circuit, the adaptive digital PAL/NTSC comb filter and a teletext decoder with a 10 page text memory.

Mono sound versions. These versions contain the TV processor with a selector for mono audio signals and the TCG m-Controller. Options are the adaptive digital PAL/NTSC comb filter and a teletext decoder with 10 page text memory.

MONO VERSIONS:

AV STEREO VERSIONS

Block diagram of STEREO sound processor.

PINNING DETAILS

3.REPLACEMENT OF MEMORY IC1. MEMORY IC.

This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection circuits.When replacing memory IC, be sure to use IC written with the initial value of data.

2. PROCEDURE FOR REPLACING MEMORY IC(1) Power off

Switch the power off and unplug the power cord from AC outlet.(2) Replace IC

Be sure to use memory IC written with the initial data values.(3) Power On

Plug the power cord into the AC outlet and switch the power On.(4) Check and set SYSTEM default value:

1) Press “MENU” key and then press number “6 4 8 3” key on the Remote control unit. 2) The “Service pages ” will be displayed on the screen.3) Press digital key, (Mkey) and corresponding on-screen display will be appear.4) Check the setting value of the SYSTEM default value of Table below. If the value is different,

select items by [CH+]/[CH-] keys and set value by [VOL+]/[VOL-] keys.5) Press “STANDBY” key again and return to the normal screen.

4.SERVICE ADJUSTMENT

FOCUS ADJUSTMENT1. Receive a crosshatch signal.2. While watching the screen, adjust the FOCUS VR to make the vertical and horizontal lines as fine and

sharp as possible.

SERVICE DATA

 

DESIGN DATA ( PRESS " MENU + 6483 " KEY ) & Press " Demo / Call " key to QUIT.

         

S.N. PARAMETER VALUE S.N. PARAMETER VALUE0 UOC 3 AV Stereo 4.01 56 PV-SH-MV 321 Init TV 0 57 PV-BR-SP 322 Shipping 0 58 PV-CL-SP 32

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3 ISP Mode 0 59 PV-CT-SP 324 VSD Brightness 34 60 PV-SH-SP 325 VSD LINE 0 61 PV-BR-ST 486 VG2 48 62 PV-CL-ST 327 DCXO(ADJUST) 59 63 PV-CT-ST 488 DCXO Auto 0 64 PV-SH-ST 329 Tube-Type 1 65 PV-BR-GA 32

10 Track.Mode 0 66 PV-CL-GA 3211 Vert. Slope 38(Adjust) 67 PV-CT-GA 5112 Vert. Shift 38 (Adjust) 68 PV-SH-GA 3213 Vert. Ampl 24 (Adjust) 69 Y SECAM 1014 S-Corr. 32 (Adjust) 70 Y NTSC 1015 Vert. Slope 60 38 (Adjust) 71 Y PAL 1016 Vert. shift 60 38 (Adjust) 72 YAV1 1017 Vert. Ampl. 60 24 (Adjust) 73 YAV2 1018 S-Corr. 60 32 74 YSVHS1 10 ( N.A.)19 Ver. Lin. 60 32 (Adjust) 75 YSVHS2 10 ( N.A.)20 Expand Option 1 76 ACL 021 Compress OPTION 0 77 MUS 022 V. Lin. Ctrl. 0 78 PWL 823 V. Linearity 32 (Adjust) 79 CB 024 Rotation 0 80 BPS 025 EW Width-4 58 (Adjust) 81 FCO 026 Hor. Shift-4 37 (Adjust) 82 SVMA 027 EW Parabola-4 26 (Adjust) 83 SVMD 728 Traepezium-4 37 (Adjust) 84 SVMG 329 UC Parabola-4 48 (Adjust) 85 SMD 330 LC Parabola-4 42 (Adjust) 86 SVM-OSD-PW 331 Hor. Bow-4 28 (Adjust) 87 SMD-OSD-TM 232 Parallel-4 25 (Adjust) 88 PeakFreqPAL443 233 Hor. Shift 60-4 37 (Adjust) 89 PeakFreqPALM 234 Vert. Scroll 32 (Adjust) 90 PeakFreqPALN 235 VX Normal 16 91 PeakFreqNTSC443 236 VX Expand 22 (Adjust) 92 PeakFreqNTSCM 237 VX Expand-60 22 (Adjust) 93 PeakFreq SECAM 238 VX Compr. 16 94 Peak Freq AV 239 VS Subt. 16 95 CRAO 040 HBL 0 96 VIDEO CORING 041 WBF 5 97 CROMA TRAP 042 WBR 8 98 GAMMA 043 WSS 1* 99 VA 144 Gld-SCART 1* 100 VAI 145 R-CUT-N 32(Adjust) 101 Blackstrech 146 G-CUT-N 32 (Adjust) 102 Bluestrech 147 RDrive-N 32(Adjust) 103 SVM OPTION 048 GDrive-N 32(Adjust) 104 Whitestrech 349 BDrive-N 32(Adjust) 105 PeakRatio0vShot 2

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50 COOL OFFSET- 20 106 Tint NTSC 3051 WARM OFFSET 20 107 SUB BRI 50 (Adjust)52 RGB 15 108 SUB CON 4753 PV-BR-MV 32 109 SUB COL 6354 PV-CL-MV 32 110 SUB SHAR 6355 PV-CT-MV 27 111 RC- OPT 28 (AKAI )

112 OSO 0113 FFI 0114 FSL 0115 HP2 1116 Soft Clip Level 0117 PSNS 2118 Mute Pin 0

Page=1/2

S.N. PARAMETER VALUE S.N. PARAMETER VALUE

119 SUB BASS 40 178 PA-B4-VO 30120 SUB TRB 35 179 PA-B5-VO 15121 Vol 1 16 180 PA-BA-MU 30122 Vol 2 32 181 PA-TR-MU 40123 Vol 3 48 182 PA-LM-MU 1124 Vol 4 63 183 PA-ST-MU 5125 SWL 40 184 PA-LO-MU 0126 Vol. Gain 63 185 PA-B1-MU 63127 Vol. Gain 2 22 186 PA-B2-MU 45128 AGN 1 187 PA-B3-MU 20129 DSG 1 188 PA-B4-MU 45130 FMWS 2 189 PA-B5-MU 63131 100Hz 40 190 PA-BA-TH 55132 300Hz 40 191 PA-TR-TH 63133 1KHz 40 192 PA-LM-TH 1134 3KHz 40 193 PA-ST-TH 5135 10KHz 40 194 PA-LO-TH 0136 OP AUDIO CONFIG 2 195 PA-B1-TH 40137 OP WOOFER 0 196 PA-B2-TH 45138 WOOFER FREQ. 4 197 PA-B3-TH 50139 OP EQUAL 1 198 PA-B4-TH 45140 OP DOLBY 0 199 PA-B5-TH 40141 OP TRUSUR 0 200 AGC Speed 1142 OP DUB 0 201 AGC 20143 AVL-LEV 8 202 OIF 32144 AVL-WGT 0 203 IF 2145 AVL-MOD 3 204 Tuner-0 G 1-T 2-P 0146 AVLE 0 205 SVO 0147 LOUD-NA 3 206 GD 1

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148 LOUD-CH 1 207 BPB 0149 BBE-CONT 7 208 DVD1-IN 0150 BBE-PROC 7 209 AV2-IN 1151 OP CLIP 3 210 CVBS-OUT 1152 DEC-LEV 15 211 INCL-AV 1153 MONO-LEV 15 212 SECAM 1154 NIC-LEV 10 213 TXT-ON 1155 ADC-AM-L 15 214 TXT-SPILT 1156 ADC-AV-L 15 215 TXT-HPOSITION 10157 BGSCAL DEC 1 216 TXT CONTRAST 15158 BGSCAL MONO 1 217 FM Radio 0159 BGSCAL NIC 1 218 PWR-SAVING 1160 BGSCAL SAP 1 219 PWR-PERF 3161 MSCAL DEC 1 220 PWR-REST 1162 MSCAL MONO 1 221 PWR-ON KEY 1163 MSCAL NIC 1 222 BUS Stop 0

164MSCAL SAP 1 223 M-Mode 0 (1 For M-

mode)165 LSCAL DEC 1 224 Comb Filter 0166 LSCAL MONO 1 225 BlUe Back Col 1167 LSCAL NIC 1 226 Game 0168 LSCAL SAP 1 227 Loudness 1169 E2D 0 228 Calender - OPT 0170 PA-BA-VO 30 229 Lock-opt 1171 PA-TR-VO 55 230 EVG 1172 PA-LM-VO 1 231 DFL 1173 PA-ST-VO 5 232 XDT 1174 PA-LO-VO 0 233 AKB 0175 PA-B1-VO 15 234 OSVE 0176 PA-B2-VO 50 CL 8177 PA-B3-VO 50

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5. ICs functional description.

Power supply: FSCQ1265RTDescription

The FSCQ1265RT is an integrated Pulse Width Modulation (PWM) controller and Sense FET specifically designed for Quasi-resonant off-line Switch Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes integrated fixed frequency oscillator, under voltage lockout, leading edge blanking (LEB), optimized gate driver, internal soft start, temperature compensated precise current sources for a loop compensation and self protection circuitry

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Audio amplifier:DESCRIPTIONThe TDA7269 is class AB dual Audio power amplifier assembled in the Multiwatt package, specially designed for high quality sound applications in stereo TV sets.

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Pin Configuration- Top View

ORDERING NUMBER: TDA7269

WIDE SUPPLY VOLTAGE RANGE UP TO20VSPLIT SUPPLYHIGH OUTPUT POWER10 + 10W @THD =10%, RL = 8, VS = +14VNO POPAT TURN-ON/OFFMUTE (POP FREE)STAND-BY FEATURE (LOW Iq)THERMAL OVERLOAD PROTECTIONSHORT CIRCUIT PROTECTION TO GND

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Vertical Amplifier:The TDA8359J is an integrated power circuit for use in 90° and 110° colour deflection systems. It contains a vertical deflection bridge output, operating as a high efficiency class G system and can handle field frequencies from 25 to 200 Hz. The vertical coil of a 4 : 3 as well a 16 : 9 picture tube can be connected to this vertical deflection device. Due to the bridgeconfiguration a DC deflection output application can be designed with a positive main supply of typical 12 Volts and a positive flyback supply of typical 45 Volt

Pinning:

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Pin No. 6: Control keys input ( Limit voltages)

6. Test point Waveforms –

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Function TV/AV MENU V- V+ P- P+Voltage 0.45-0.55V 1.9-2.1V 1.4-1.7V 1.1-1.3V

0.75-0.85V0.15-0.35V

GIII PIN 85

1.5Vpp - B 1.5Vpp - G 1.5Vpp- R

H H H

GIII PIN 86 GIII PIN 87

2.0Vpp

H H

GIII PIN 43 4.8 Vpp 0.7Vpp - Hor.

CRT KB CRT KG CRT KR

80Vpp 80Vpp 80Vpp

H H H

7. IC voltagesAC supply : 176~260V 50/60Hz

GIII IC

PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

V 0 0 1.74

3.09 3.09 0 3.09 0 3.09 1.41 1.41 0 0.14 2.46 4.92 1.60

PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

V 2.3 0 2.29

2.30 3.30 0.71 0.66 1.91 1.91 2.31 1.93 0 1.90 1.90 4.14 1.94

PIN 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

V 0.18 NC NC 2.09 2.09 2.29 2.44 0 1.99 1.80 4.87 NC 4.96 2.26 4.87 1.59

PIN 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

V 2.18 2.18

1.39 NC NC NC NC 2.18 2.18 1.39 1.55 2.20 2.20 NC NC NC

PIN 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

V NC 0.26

0.40 0 4.94 NC NC NC 2.08 1.78 NC NC 3.38 1.24 1.24 1.24

PIN 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

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H-OUT C

1000VPP 2.0 Vpp

H H

VDRA- 0.8 Vpp

V H

CRT SUPPLY HEATER– R713

140 VppCRT-PCB- 22Vpp

H H

GIII PIN-67 GIII PIN-66

VDRB-0.8Vpp

V

GIII PIN23 GIII PIN24 GIII PIN36

V 0 4.91

3.32 3.8 2.94 2.95 2.81 3.07 0 3.11 1.54 0 1.66 3.11 0 1.66

PIN 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112

V 4.82 NC NC 1.76 0 0.03 NC NC NC 3.76 0 3.20 3.20 2.10 NC NC

PIN 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128

V NC 0 NC NC 1.76 1.77 NC 3.12 0 0 NC 1.72 1.72 NC NC NC

Vertical Amplifier IC TDA-8359PIN 1 2 3 4 5 6 7 8 9

V 0.97 0 14.96 7.50 0 44.6 7.8 0 7.4

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8. PURITY / CONVERGENCE ADJUSTMENTPURITY ADJUSTMENT

1. Demagnetize CRT with the demagnetizer.

2. Loosen the retainer screw of the deflection yoke.

3. Remove the wedges.

4. Input a green raster signal from the signal generator, and turn the screen to green raster.

5. Move the deflection yoke backward.

6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig2)

7. Adjust the gap between two lugs so that the GREEN RASTER will come into the center of the screen. (Fig. 3)

8. Move the deflection yoke forward, and fix the position of the deflection yoke so that the whole screen will become green.

9. Insert the wedge to the top side of the deflection yoke so that it will not move.

10. Imput a crosshatch signal.

11. Verify that the screen is horizontal.

12. Input red and blue raster signals, and make sure that purity is properly adjusted.

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CRT

WEDGE DEFLECTION YOKE

P

4 6

P: PURITY MAGNET

4: 4-POLES (convergence magnets)

6: 6-POLES (convergence magnets)

P/C MAGNETS

Fig. 1

PURITY MAGNETS

Long lug

Short lug

Bring the long lug over the short lug

and position them horizontally.

Fig. 2

(FRONT VIEW) GREEN RASTER

CENTER

Fig. 3

STATIC CONVERGENCE ADJUSTMENT

1. Input a crosshatch signal.

2. Using 4-pole convergence magnets, overlap the red and blue lines in the center of the screen (Fig. 1) and turn them to magenta (red/blue).

3. Using 6-pole convergence magnets, overlap the magenta (red/blue) and green lines in the center of the screen and turn them to white.

4. Repeat 2 and 3 above, and make the best convergence.

DYNAMIC CONVERGENCE ADJUSTMENT

1. Move the deflection yoke up and down and overlap lines in the periphery. (Fig. 2)

2. Move the deflection yoke left to right and overlap the lines in the periphery. (Fig. 3)

3. Repeat 1 and 2 above, and make the best convergence.

After adjustment, fix the wedge at the original position.Fasten the retainer screw of the deflection yoke.Fix the 6 magnets with glue.

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(FRONT VIEW)

Fig. 1

(FRONT VIEW)

RED GREEN BLUE

BLUE

RED

GREEN GREEN

RED BLUE

BLUE GREEN RED

Fig.2

(FRONT VIEW)RED GREEN BLUE BLUE GREEN RED

RED

GREEN

BLUE

BLUE

GREEN

RED

Fig. 3