LG CT-20T25M Service Manual Download

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LOCA. NO PART NO DESCRIPTION

R312

R313

R314

R315

R32

R328

R33

R35

R37

R38

R403

R404

R405

R409

R410

R412

R418

R419

R42

R420

R421

R422

R501

R502

R503

R505

R506

R507

R508

R509

R510

R511

R512

R513

R514

R515

R516

R517

R518

R519

R520

R521

R522

R523

R524

R526

R527

R530

R532

R534

R535

R536

0RD4701F609

0RN0471H609

0RS2700K607

0RD3301F609

0RN3602F409

0RD1000F609

0RD1002F609

0RD5600A609

0RD0332A609

0RS8200K607

0RD1501A609

0RS2702K607

0RD7501A609

0RD2702F609

0RD4701F609

0RD2702F609

0RD3600F609

0RD1002F609

0RD3301F609

0RN6801F409

0RD1000F609

0RD2202F609

0RD3300F609

0RD1201F609

0RD3600F609

0RD0332F609

0RD1600F609

0RD0222F609

0RD2701F609

0RD1001F609

0RD3002F609

0RD0152F609

0RD1000F609

0RD1201F609

0RD2702F609

0RD3304F609

0RD1000F609

0RD1201F609

0RD2200F609

0RD1801F609

4.7K OHM 1/6 W 5% TA52

4.7 OHM 1/2 W 5.00% TA52

270 OHM 2 W 5.00% TA62

3.3K OHM 1/6 W 5.00% TA52

36K OHM 1/6 W 1.00% TA52

100 OHM 1/6 W 5% TA52

10K OHM 1/6 W 5% TA52

560 OHM 1/2 W(7.0) 0.05 TA52

33 OHM 1/2 W(7.0) 5.00% TA52

820 OHM 2 W 5.00% TA62

1.5K OHM 1/2 W(7.0) 5.00% TA52

27K OHM 2 W 5.00% TA62

7.5K OHM 1/2 W(7.0) 5.00% TA52

27K OHM 1/6 W 5.00% TA52

4.7K OHM 1/6 W 5% TA52

27K OHM 1/6 W 5.00% TA52

360 OHM 1/6 W 5.00% TA52

10K OHM 1/6 W 5% TA52

3.3K OHM 1/6 W 5.00% TA52

6.8K OHM 1/6 W 1.00% TA52

100 OHM 1/6 W 5% TA52

22K OHM 1/6 W 5% TA52

330 OHM 1/6 W 5.00% TA52

1.2K OHM 1/6 W 5% TA52

360 OHM 1/6 W 5.00% TA52

33 OHM 1/6 W 5.00% TA52

160 OHM 1/6 W 5.00% TA52

22 OHM 1/6 W 5.00% TA52

2.7K OHM 1/6 W 5% TA52

1K OHM 1/6 W 5% TA52

30K OHM 1/6 W 5.00% TA52

15 OHM 1/6 W 5.00% TA52

100 OHM 1/6 W 5% TA52

1.2K OHM 1/6 W 5% TA52

27K OHM 1/6 W 5.00% TA52

3.3M OHM 1/6 W 5.00% TA52

100 OHM 1/6 W 5% TA52

1.2K OHM 1/6 W 5% TA52

220 OHM 1/6 W 5.00% TA52

1.8K OHM 1/6 W 5.00% TA52

LOCA. NO PART NO DESCRIPTION

R539

R540

R542

R543

R545

R555

R557

R558

R562

R563

R603

R604

R605

R606

R607

R608

R609

R610

R613

R615

R616

R617

R619

R620

R621

R664

R802

R803

R804

R805

R806

R807

R808

R809

R810

R814

R816

R817

R823

R827

R828

R831

R838

R840

R842

R843

R844

R845

R846

R847

R858

R903

0RD1002F609

0RD4702F609

0RD8200F609

0RD9100F609

0RD1002F609

0RD6800F609

0RD3301F609

0RD3001F609

0RD0752F609

0RD0221A609

0RD1101F609

0RD5101F609

0RD1002F609

0RD1001F609

0RD1000F609

0RD1802F509

0RD0221F609

0RD1001F609

0RD2700F609

0RD6801F609

0RD1000F609

0RD6801F609

0RKZVTA001K

180-822N

0RS4702K619

180-A01N

0RD2200A609

0RD1501F609

0RD1001F609

0RD0472F609

0RK8204H609

0RD1001F609

0RD0152F609

0RD4701F609

0RD1001F609

0RD1501F609

0RD2201F609

0RD4701F609

0RF0141K607

0RD1002F609

0RD3900A609

0RD1001F609

0RD1002F609

0RD7502F609

0RD2403F609

0RD4701F609

0RD2200F609

10K OHM 1/6 W 5% TA52

47K OHM 1/6 W 5% TA52

820 OHM 1/6 W 5.00% TA52

910 OHM 1/6 W 5.00% TA52

10K OHM 1/6 W 5% TA52

680 OHM 1/6 W 5% TA52

3.3K OHM 1/6 W 5.00% TA52

3K OHM 1/6 W 5.00% TA52

75 OHM 1/6 W 5.00% TA52

2.2 OHM 1/2 W(7.0) 5.00% TA52

1.1K OHM 1/6 W 5.00% TA52

5.1K OHM 1/6 W 5.00% TA52

10K OHM 1/6 W 5% TA52

1K OHM 1/6 W 5% TA52

100 OHM 1/6 W 5% TA52

18K OHM 1/6 W 2.00% TA52

2.2 OHM 1/6 W 5.00% TA52

1K OHM 1/6 W 5% TA52

270 OHM 1/6 W 5% TA52

6.8K OHM 1/6 W 5.00% TA52

100 OHM 1/6 W 5% TA52

6.8K OHM 1/6 W 5.00% TA52

0.47M OHM 1/2 W 5% TA52

RWR 7W 1.0 OHM J PD

47K OHM 2 W 5% TR

0.18 OHM 2 W 5% TA62 PRW

220 OHM 1/2 W(7.0) 5.00% TA52

1.5K OHM 1/6 W 5% TA52

1K OHM 1/6 W 5% TA52

47 OHM 1/6 W 5% TA52

8.2M OHM 1/2 W 5.00% TA52

1K OHM 1/6 W 5% TA52

15 OHM 1/6 W 5.00% TA52

4.7K OHM 1/6 W 5% TA52

1K OHM 1/6 W 5% TA52

1.5K OHM 1/6 W 5% TA52

2.2K OHM 1/6 W 5.00% TA52

4.7K OHM 1/6 W 5% TA52

1.4 OHM 2 W 5.00% TA62

10K OHM 1/6 W 5% TA52

390 OHM 1/2 W(7.0) 5.00% TA52

1K OHM 1/6 W 5% TA52

10K OHM 1/6 W 5% TA52

75K OHM 1/6 W 5.00% TA52

240K OHM 1/6 W 5.00% TA52

4.7K OHM 1/6 W 5% TA52

220 OHM 1/6 W 5.00% TA52

For Capacitor & Resistors,
the charactors at 2nd and 3rd
digit in the P/No. means as
follows;

CC, CX, CK, CN : Ceramic
CQ : Polyestor
CE : Electrolytic

RD : Carbon Film
RS : Metal Oxide Film
RN : Metal Film
RF : Fusible

Summary of Contents for CT-20T25M

Page 1: ...R TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS MC 049B MODEL CT 20T25M website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...ety Precautions 3 Control Descriptions 4 Specifications 7 Adjustment Instructions 8 T rouble Shooting 12 Printed circuit board 16 Block Diagram 18 Exploded View 20 Exploded View Parts List 21 Replacement Parts List 22 SVC Sheet ...

Page 3: ...perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ...

Page 4: ...ndby scans programmes automatically F G Volume Up Down adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 6 Q VIEW returns to the previously viewed programme 7 TELETEXT BUTTONS option These buttons are used for teletext For further details see the Teletext section 8 PSM Picture Status Memory recalls your preferred picture setting 9 FAVOURITE selects a f...

Page 5: ... and sub picture INPUT selects the input mode for the sub picture SIZE adjusts the sub picture size STILL freezes motion of the sub picture POSITION relocates the sub picture in clockwise direction 9 4 PIP switches on or off the 9 or 4 sub pictures No function COLOURED BUTTONS These buttons are used for teletext only TELETEXT models or programme edit Without TELETEXT PIP POWER MUTE 1 2 3 4 5 6 7 8...

Page 6: ... item switches the set on from standby 6 AUDIO or AUDIO L R VIDEO IN SOCKETS AV2 option Connect the audio video out sockets of external equipment to these sockets 7 HEADPHONE SOCKET option Connect the headphone plug to this socket 8 TURBO SOUND PICTURE option switches Turbo sound or Turbo picture on or off 9 EYE option adjusts picture according to the surrounding conditions 6 7 VIDEO L MONO I AUDI...

Page 7: ...d input Voltage 110 240V 50 60Hz 4 Measurement must be performed after heat run more than 20min 5 Adjusting Standard for this chassis is followed a special standard No 1 2 3 4 5 6 7 8 Item Receiving System Receiving Channel Input Voltage Market Screen Size Tuning System Operating Environment Storage Environment Remark For EU For Non EU For EU For Non EU NTSC M Multi model Non EU EU FLAT CONVENTION...

Page 8: ...ve the DY to make equal red on whole screen and it does not to make the DY by fixed screw after check a simple color of Red Green Blue and white raster whether or not it is a pollution of color At this time take care raster of screen and DY must fixing in the condition which maintains a horizontality 6 Check the receiver by move direction When adjustment is not working adjust with the assisted MAG...

Page 9: ...U05CH 2 Deflection setting data adjustment is operate by SVC communicator 3 Enter the deflection adjustment mode by selection SERVICE1 on SERVICE MENU after pressing LINE SVC MODE IN START KEY 4 Use the CH D E key to select adjustment item 5 Use the VOL F G key to increase decrease data Note 1 When adjusting a deflection adjust N50Hz of PAL signal first and adjust a deflection at Normal 60Hz NTSC ...

Page 10: ...S VA VL SC HS 512 511 512 511 512 511 512 511 32 2047 150 12 140 6 100 140 12 140 6 123 Variable range N50Hz PAL FLAT 21 N60Hz NTSC FLAT 21 INCH SYS SOUND CH AU Option Code 0 1 2 3 4 5 6 7 0 1 2 3 0 1 2 3 0 1 Function 21A 21B 21C 29F 25F 28WF 32WF 28N 34F 29N 25N BG I DK BG I DK L BG I DK M BG L RF STEREO AV STEREO MONO MONO DUAL Using Not using Table 4 Initial deflection setting data AV2 DVD SCAR...

Page 11: ...14 15 16 17 0 1 0 100 Function ENG ONLY EU 5EA EU ETC GREECE EU ALL FARSI ARAB URDU E HINDI E I M V E THAI E CHINA WEST EU EAST EU1 TURKEY EU EAST EU2 CYRILLIC1 CYRILLIC2 CYRILLIC3 TURK GRE1 TURK GRE2 TURK GRE3 ARAB FRA ARAB ENG ARAB HEB1 ARAB HEB2 FARS ENG FARS FA FARS ALL AUTO WITHOUT HDEV WITH HDEV SETTING VOL MAX ...

Page 12: ...k The voltage At pin of IC821 IC822 Q807 Check Replace C821 IC822 Q807 Check The Voltage At pin 2 19 20 21 24 of IIC11 Check Replace TU 101 Check Replace F806 D828 D805 OK OK OK OK OK OK NO NO NO NO NO NO No Raster Sound OK 1 2 Check the Heater voltage of CPT 6 6 4Vrm s Check HV Screen Voltage of CPT Check the Heater pulse of FBT T402 Check R G B out of CPT Board Check FBT T402 Check 185V line of ...

Page 13: ...Check T401 each pin voltage Check Replace T402 Check the Voltage Of C803 Check the Voltage Pin 4 OF IC801 Check Replace IC801 IC802 IC826 Check Fuse and Diode of secondary Load of SMPS trans T803 Check Replace IC11 Check Replace IC11 Check Replace Q402 Check Replace T401 Check Replace Q401 Check Replace Fuse Check Replace DB801 Check Replace Fuse IC801 NO OK OK OK NO Open NO 18 20V Normal Yes Yes ...

Page 14: ...p Check 1 8V 3 3V 5V DC Voltage Check SMPS Trans Secondary Voltage Check pin18 Reset Voltage Check IC13 Reset IC Check pin57 58 SCL SDA Check IC12 EEPROM SCL SDA Line RelaceIC11 Q501 Q503 Q504 R G B out of IC11 Check Replace CPT Board com ponent Go to No Sound Picture OK OK OK OK OK NO NO NO NO NO NO 3 3V DC OK OK 3 3V DC Check receiving system in MENU execute Auto Program ...

Page 15: ...age Of pin2 19 20 21 24 of IC11 Check the signal line of SPK L R Check pin 55 m ute of IC11 Check the waveform At pin2 4 of IC601 Check the waveform At pin6 of IC601 Check the waveform At pin8 9 11 12 of IC601 Check thevpltage At pin7 5 of IC601 Check Replace D828 D805 F806 Check the connection of side or Front AV Board P603A Replace IC601 AV OK OK OK OK NO NO OK OK NO NO NO NO Correct the Board N...

Page 16: ... 16 PRINTED CIRCUIT BOARD MAIN ...

Page 17: ...5 D5 J206 C3 J207 D5 J208 C1 J209 D4 J210 C5 J211 C5 J212 E5 J213 D5 J214 D5 J215 B5 J216 D5 J217 B5 J219 D4 J220 D5 J221 D5 J222 D5 J223 B5 J224 B5 J225 E5 J226 C1 J230 C1 J231 C1 J232 D1 J233 C1 J234 C1 J235 C1 J242 D1 J261 C5 J301 C4 J302 D4 J303 E4 J306 D4 J308 B2 J309 B2 J310 B2 J311 E4 L11 E1 L12 C3 L101 A5 L102 B5 L103 B5 L201 C5 L202 D5 L203 D5 L204 C5 L205 E5 L206 C5 L207 D5 L208 D5 L210 ...

Page 18: ... AMP IC301 TDA4863A 14V 14V VA H OUT 35V H Vc c TU 33V S Vc c 6 5 V 12V B SAW FILTER Z101 PIP_BOARD SDA9489X S1117 18 IC825 S111 7 33 IC853 KIA78S06P IC824 KA78R33 KA78R05C ST 5V ST 3 3V ST 1 8V 3 3 V GAME HIC HIC01 190 V VB H FLB IIC 33V 5V TV MONITOR OUT SCART RGB IN Y Cb Cr IN AV IN H Vc c 5V S Vc c PIP RGB PIP VIDEO IIC VS H FLB 5V ST 5V ON OFF DATA CLOCK RESET VIDEO AUDIO 190V ...

Page 19: ... 19 MEMO ...

Page 20: ... 20 EXPLODED VIEW 943 400 300 330 320 310 120 170 150 153 112 174 520 OPTION 504 503 ...

Page 21: ...49B 3091V00517D CABINET ASSEMBLY CT 20T25M PH MONO MC049B SY ASSEMBLE 310 5020V00070N BUTTON CONTROL CT 21T25M CKD ABS HF 380 6KEY 117A SPRAY 320 320 070G SPRING COIL 330 5020V00071H BUTTON POWER CT 21T25M ABS HF 380 1KEY 049B 400 3809V00028Y BACK COVER ASSEMBLY CT 21T25M CKD 1PHONE MC049B 407AF 3809V00028X BACK COVER ASSEMBLY CT 21T25M CKD 1PHONE MC049B 503 303 F62A COVER TUNER 504 351 008A LINK ...

Page 22: ...V M FL TP5 100UF STD 10V M FL TP5 4 7UF STD 50V 20 FL TP 5 0 1UF D 50V 80 20 F Y5V TA52 1000P 50V K B TA52 0 1UF D 50V 80 20 F Y5V TA52 100P 50V K B TA52 LOCA NO PART NO DESCRIPTION IC11 IC12 IC13 IC301 IC601 IC801 IC802 IC821 IC822 IC824 IC825 IC826 IC853 IC901 Q104 Q11 Q301 Q401 Q402 Q403 Q501 Q502 Q503 Q504 Q505 Q507 Q508 Q510 Q601 Q801 Q802 Q803 Q804 Q807 Q808 D301 D403 D405 D406 D407 D444 D50...

Page 23: ...24 C525 C526 C527 C528 C529 C530 C531 C532 C533 C534 C535 C536 C537 C538 C540 C541 C542 C543 C545 C546 C547 C548 C550 C602 C605 C606 C607 C608 C609 C610 C611 C612 C615 C616 C617 C619 C620 C625 C627 C632 C803 C803 C804 C806 C807 C809 C810 C811 0CE107DD618 0CN1040K949 0CN1040K949 0CE107DD618 0CN3310K519 0CN1040K949 0CN1040K949 0CN1040K949 0CN1040K949 0CN1010K519 0CX3300K409 0CN1040K949 0CE107DD618 0...

Page 24: ... CHOKE 82UH PHY TURN LOCA NO PART NO DESCRIPTION T401 T803 F802 F804 F805 F806 FR401 FR403 FR404 FR405 FR901 J211 J402 R102 R109 R110 R111 R112 R113 R12 R124 R125 R126 R127 R13 R14 R15 R16 R17 R18 R19 R20 R212 R24 R25 R252 R253 R28 R29 R30 R302 R303 R304 R305 R306 R307 R308 R309 R31 R310 151 C02F 6170VMCA43J 0RP0050H709 0RP0050H709 0RP0020J809 0RP0020J809 0RF0141K607 0RP0050H709 0RP0050H709 0RP005...

Page 25: ... OHM 1 6 W 5 00 TA52 LOCA NO PART NO DESCRIPTION R539 R540 R542 R543 R545 R555 R557 R558 R562 R563 R603 R604 R605 R606 R607 R608 R609 R610 R613 R615 R616 R617 R619 R620 R621 R664 R802 R803 R804 R805 R806 R807 R808 R809 R810 R814 R816 R817 R823 R827 R828 R831 R838 R840 R842 R843 R844 R845 R846 R847 R858 R903 0RD1002F609 0RD4702F609 0RD8200F609 0RD9100F609 0RD1002F609 0RD6800F609 0RD3301F609 0RD3001...

Page 26: ...FERRITE AXIAL 62MM 1UH NY 3 5X6 0MM FERRITE AXIAL 62MM 1UH NY 3 5X6 0MM FERRITE AXIAL 62MM 1UH NY 3 5X6 0MM SQE2930 36MH 0 5PHY 105TURN RESONATOR HC49U 20 250MHZ 30PPM 13PF BK B39361 X6966 D100 EPCOS ST TACT SKHV17910B LG C D 12V TACT SKHV17910B LG C D 12V TACT SKHV17910B LG C D 12V TACT SKHV17910B LG C D 12V TACT SKHV17910B LG C D 12V TACT SKHV17910B LG C D 12V SDKEA3 ALPS IEC 250V 8A HORIZONTAL ...

Page 27: ...P NO 3854VA0162A S1 2004 6 12 ...

Page 28: ...SVC SHEET 3854V A0162A S ...

Page 29: ...July 2004 Printed in Korea P NO 3828VD0199K ...

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