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LG RT-25FB700PX, Service Manual

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LG RT-25FB700PX Service Manual Download Page 1

COLOR TV

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CHASSIS : MC-022A

MODEL:RT-29FB70RB/RE/RQ/RX

MODEL:

RT-29FB70V/VE/VQ/VT

MODEL:

RT-25FB700PX

MODEL:

RT-25FB70V/VE/VQ

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

Summary of Contents for RT-25FB700PX

Page 1: ...CING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS MC 022A MODEL RT 29FB70RB RE RQ RX MODEL RT 29FB70V VE VQ VT MODEL RT 25FB700PX MODEL RT 25FB70V VE VQ website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATIONS 4 DESCRIPTION OF CONTROLS 5 ADJUSTMENT 8 BLOCK DIAGRAM 15 TROUBLE SHOOTING 17 EXPLODED VIEW 22 EXPLODED VIEW PARTS LIST 23 REPLACEMENT PARTS LIST 24 ...

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 positioin connect one lead of...

Page 4: ...me memory 200 Programme memory W O TXT Model O Antenna input impedance VHF UHF 75 ohm unbalanced O Voice coil impedance 8 ohm O External In Output Audio In 0 5Vrms 3db over 10Kohm Audio Out 0 5Vrms 3db below 1Kohm Video In Out 1Vp p 3db 75ohm R G B In 0 7Vp p 3db O Feature Funtion Teletext TOP FLOF LIST AV Input Side or Front 1 Rear 2 Component Input Rear Opt PERI TV Connector AV Input SCART Opt R...

Page 5: ...settings 6 VCR BUTTONS option control a LG video cassette recorder 7 SSM Sound Status Memory recalls your preferred sound setting 8 I II option selects the language during dual language broadcast option selects the sound output 9 PSM Picture Status Memory recalls your preferred picture setting 10 TELETEXT BUTTONS option These buttons are used for teletext For further details see the Teletext secti...

Page 6: ...lects 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 COLOURED BUTTONS These buttons are used for teletext only TELETEXT models or programme edit OK PR VOL PR VOL PLAY P STILL STOP REC REW FF I II SSM LIST PSM SLEEP Q VIEW 0 ARC T...

Page 7: ...ff 11 EYE option adjusts picture according to the sur rounding conditions 12 HEADPHONE SOCKET option Connect the headphone plug to this socket 13 AUDIO VIDEO IN SOCKETS AV3 Connect the audio video out sockets of external equipment to these sockets S VIDEO AUDIO IN SOCKETS S AV option Connect the video out socket of an S VIDEO VCR to the S VIDEO socket Connect the audio out sockets of the S VIDEO V...

Page 8: ...ne B 2 Adjust the upper Focus volume of FBT for the best focus of area A 3 Repeat above step 1 and 2 for the best overall focus 5 Screen Voltage White Balance Adjustment 5 1 Adjustment of screen manually Using ADJ Remote Control 1 Receive the PAL or SECAM NTSC signal into RF mode regardless of channel 2 If you press the ADJ button in LINE SVC mode IN START button the LINE SVC mode changes to scree...

Page 9: ... 3 PAL 16 9 PAL ZOOM NTSC 4 3 NTSC 16 9 NTSC ZOOM 3 After finishing deflection adjustment press the ENTER button to enter or exit in SVC mode VL Vertical Linearity Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT VA Vertical Amplitude Adjust so that the circle of a digital circle pattern may be located within the effective scree...

Page 10: ...B4 0840 0840 0000B 0050 00CF 0025 00BF 0000 009F 0600 0900 0000 003F 0400 0EFF 0700 08FF 06E0 0840 06A0 0AFF 0790 08E0 0790 08E0 ITEM RANGE Z50Hz N50Hz W50Hz VA VL SC VS HS EW ET EP ES EC PIP P 11 0 0 0 0 0 0 14 0 0 0 22 3 0 0 0 22 0 19 0 0 0 009A 00F3 00D0 0774 0019 0B96 07DE 07BF 085C 082B 0007 0050 00CF 0025 00BF 0000 009F 0600 0900 0000 003F 0400 0EFF 0700 08FF 06E0 0840 06A0 0AFF 0790 08E0 07...

Page 11: ...aration for Adjustment 1 This decides funtion in accordance with model Press the SVC TX adjustment button IN START button at SVC mode then adjust the option at OPTION 1 2 3 4 mode 2 Mark the option adjustment data like 111 11 111 11 in BOM 8 2 Adjustment Method 1 Input data directly by the buttons corresponded with OPTION1 0 255 OPTION2 0 255 OPTION3 0 127 OPTION 4 0 255 2 Select each OPTION funct...

Page 12: ...n SAVE DUAL SOUND Condition PHONE JACK SCART JACK NORMAL VOLUME CURVE RUSHED VOLUME CURVE Without DVD INPUT With DVD INPUT Without HOTEL OPTION With HOTEL OPTION MAX VOLUME TXT Model W O TXT Model 1 PIP or W O PIP 2 PIP CE RE MODEL CL RL MODEL CT RT MODEL 1 TUNER Model 2 PIP only 1 TUNER Model 2 PIP only PAL model ALL PIP SYS TBS WOOF AV2 MONO GAME Option Code 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 Funct...

Page 13: ... Cyrilic E Russia EU EAST E Ger Rum Pin Hung Chez EU EAST All E Ger Rum Pol Hung Chez Russia English Only Eng EU 7 E Ger Fr Ita Spain Holand Port EU NORTH E Ger Fr Holand Swe Nor Den Fin Cyrilic E Russia EU EAST E Ger Rum Pin Hung Chez EU EAST All E Ger Rum Pol Hung Chez Russia English Only Eng EU 5 E Ger Fr Ita Spain English Only Eng Vietnam E Vietnam Hindi E Hindi China E China Eng Spain Port Sp...

Page 14: ...nglish WEST EU EAST EU Turkey Cyrillic3 Arab English WEST EU EAST EU Turkey Cyrillic3 WEST EU EAST EU Turkey Cyrillic3 WEST EU EAST EU Turkey Cyrillic3 Arab English Farsi English Farsi only 3834 only W TXT Arab Asia 3834 only W TXT WEST EU 3834 only W TXT EAST EU 3834 only W TXT 28 WIDE FLAT 3834 only W TXT OPTION TXT L ...

Page 15: ...orizontal Deflection TO TO Cathode Cathode 0f 0f CPT CPT AT24C16 EEPROM I I 2 2 C Bus C Bus Tilt Control Tilt Tilt Controller TO TO TILT TILT COIL COIL VCT 3801 3804 3834 Main Control Processor MSP 34xxG Sound Processor TDA 6109 6107 JF R G B AMP R G B W O PIP CVBS H Out V Sinc Protect H H DY DY FBT FBT H Sinc V V DY DY VA H Out V Out TDA 7297 7266 Sound Amp TDA 2066 Mono Opt W O PIP AV1 2 3 Y C V...

Page 16: ...TDA6109 MSP 34XX Sound Processor 7805 Tuner Main VCT3834 LD3 3V TDA 2006 Mono Opt SDA 9489X PIP Processor CXA 2040AQ Video Switch EYE Opt Tilt Opt STK396 110 VM IC 12V SMPS TRANS ST BY TRANS ST 5V 12V 9V 5V PIP AV SW OPT 7805 LD3 3V 5V Tuner Sub Relay VM 200V FBT LA 7845 V AMP 14V FBT EW AMP 28V FBT T803 T802 IC01 IC661 IC602 ICP01 ICP101 IC901 HIC920 ...

Page 17: ... NO NO NO Check The Voltage At pin 16 33 46 of IC661 Check Replace Q671 672 Check Replace Q621 IC603 Check Replace F851 D862 Check Replace IC610 IC853 Check The voltage At pin of IC610 IC853 NO OK OK OK OK OK OK NO No Raster Sound OK Check the Heater voltage of CPT 6 6 5Vrms Check HV Screen Voltage of CPT Check IK Current of IC01 pin37 39 40 Check the Heater pulse of FBT T402 Check Replace CPT Boa...

Page 18: ...C01 H Out Check Q402 Collector waveform Check T401 each pin voltage Check Replace T402 Is the voltage at pin3 15 45 IC02 5V Check the In out of IC855 IC851 Check the In out of IC06 IC07 Check IC01 Pin1 high Check Replace IC01 Check Replace IC01 Check Replace Q402 Check Replace T401 Check Replace IC01 IC03 Check the Voltage at D860 or D858 cathode Check Replace F853 F855 Normal Abnormal Ok 254 380 ...

Page 19: ... IIC Bus Line Of Tuner Is the CVBS signal OK IC01 pin10 or 22 Check R G B signal At IC01 pin42 43 44 Check Replace CPT Board component Go to No Sound Picture OK Check IC01 pin37 42 43 44 IK R G B Check Replace IC01 Check 5V 33V IIC Bus Line Check Replace IC01 Tuner Check CVBS signal Line IC01 Check IK Signal at IC01 pin37 similar to CBVS No No No No No OK OK OK OK OK OK OK OK ...

Page 20: ...he waveform At pin 24 25 of IC661 Check waveform At pin 4 12 of IC602 Check the voltage At pin6 7 of IC602 Check the waveform At pin 1 2 14 15 of IC602 Check the voltage Of pin16 20 Check Replace IC602 Check Replace Q621 IC603 Check the vpltage At pin3 13 of IC602 Replace IC 602 Check Replace F851 D862 OK AV OK OK OK OK OK OK NO NO NO NO NO NO OK ...

Page 21: ...MEMO 21 ...

Page 22: ... 22 EXPLODED VIEW 913 170 150 112 153 300 174 600 330 320 120 120 520 943 400 700 540 ...

Page 23: ...3A BUTTON POWER 1KEY 400 3809V00429A 3809V00406B BACK COVER ASSEMBLY 3809V00406F BACK COVER ASSEMBLY RT 29FB70V 2PHONE FOR LGEVN ASSY 3809V00406G BACK COVER ASSEMBLY RT 29FB70RX 2PHONE C SKD LGEMT 3809V00406H BACK COVER ASSEMBLY RT 21FB70RB 2PHONE NON 3809V00430A BACK COVER ASSEMBLY RT 29FB70 2PHONE LGESY LOCAL 510 6871VSMB26M PWB PCB ASSEMBLY SUB CPT MC022A 6871VSMD76A 6871VSMD76A PWB PCB ASSEMBL...

Page 24: ... PF 5P 50V D NP0 TS 5P 50V D NP0 TS LOCA NO PART NO DESCRIPTION HIC920 IC01 IC03 IC06 IC07 IC09 IC301 IC302 IC602 IC603 IC610 IC661 IC662 IC801 IC802 IC803 IC851 IC853 IC855 IC856 IC901 Q108 Q108 Q1106 Q180 Q181 Q182 Q183 Q184 Q185 Q186 Q187 Q201 Q202 Q301 Q302 Q303 Q401 Q402 Q505 Q506 Q507 Q508 Q509 Q509 Q621 Q671 Q672 Q806 Q807 Q853 Q855 0IZZVF0018A 0ICTMMN006B 0IAL241610B 0ISG111733B 0ISG111733...

Page 25: ...C305 C306 C308 C309 C310 C311 C401 C401 C402 C403 C405 C406 C407 C408 C409 C410 C411 C413 C415 C416 C419 C420 C422 C501 C502 C503 C503 C504 C505 C506 C509 C510 C511 C512 C515 C516 C517 C518 C520 C521 C522 C523 C559 C561 C562 C563 C564 C565 0CE107DD618 0CE476DD618 0CE226DF618 0CQ1031N509 0CQ3341N401 0CE107BK618 0CQ6821N509 0CQ1021N509 0CQ3331N509 0CE476DK618 0CN4710K519 0CQ1031N509 0CQ1031N509 0CE1...

Page 26: ...CA NO PART NO DESCRIPTION C858 C860 C860 C861 C862 C862 C864 C865 C867 C868 C871 C872 C873 C874 C874 C880 C901 C902 C903 C904 C920 C921 C922 C923 C924 C925 C926 C927 C928 C929 C930 R1204 R1205 J134 J225 J347 L01 L04 L05 L08 L103 L1203 L1204 L1207 L121 L210 L211 L212 L213 L214 L241 L242 L245 0CE108BF618 0CE108BF618 0CE108DF618 0CE108DF618 0CE105DK618 0CE335CK636 0CE108BJ618 181 091Q 0CE227DK618 0CE...

Page 27: ... J164 J167 J170 J175 J207 J210 L1102 R01 R02 R06 R06 R07 R08 R09 R10 R102 R11 R1101 R1136 R1143 R1146 R1147 R1148 R1149 R1150 R119 R12 R1202 R1207 R1230 R1231 R126 R126 R127 R127 R128 R129 R130 R131 R132 R133 R135 R136 R137 R138 R18 R180 R181 R182 R183 R184 R185 R186 R187 R188 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD4702F609 0RD0472F609 0RD1000F609 0RD1000F609 0RD3001F609 0R...

Page 28: ... 00 TA52 LOCA NO PART NO DESCRIPTION R405 R408 R409 R410 R411 R413 R414 R415 R416 R417 R419 R42 R420 R509 R51 R512 R517 R518 R519 R523 R525 R526 R528 R531 R532 R533 R534 R537 R541 R542 R543 R544 R545 R546 R548 R549 R550 R552 R553 R554 R556 R557 R558 R559 R560 R570 R571 R572 R601 R601 R602 R603 R603 R604 R607 0RS1000K619 0RS0221K607 0RS1801H609 0RMZVBK002D 0RS5102H609 0RS2202H609 0RS1001H609 0RD100...

Page 29: ... 5 TA52 3 6K OHM 1 6 W 5 00 TA52 3 3K OHM 1 6 W 5 00 TA52 0 05 OHM 1 2 W 10 TA52 0 05 OHM 1 2 W 10 TA52 0 02 OHM 1 W 20 TA52 0 05 OHM 1 2 W 10 TA52 4 7 OHM 1 6 W 5 TA52 10 OHM 2 W 5 TR 4 7 OHM 1 6 W 5 TA52 5 6K OHM 1 6 W 5 TA52 2K OHM 1 6 W 5 TA52 1 6 OHM 2 W 5 00 TA62 1 6 OHM 2 W 5 00 TA62 10K OHM 1 2 W 5 00 TA52 75K OHM 1 6 W 5 00 TA52 10K OHM 1 6 W 5 TA52 4 7K OHM 1 6 W 5 TA52 300 OHM 1 6 W 5 0...

Page 30: ......

Page 31: ...510 C4 J511 C4 J512 C5 J513 C5 J514 D5 J515 C3 J601 E1 J602 E1 J603 B2 J604 B2 J605 B2 J606 B2 J607 B2 J608 B2 J609 B2 J610 A3 J611 A3 J612 A2 J613 A2 J614 A2 J615 A2 J616 A2 J617 A2 J618 B2 J619 A3 J620 A4 J621 A4 J622 A4 J623 B4 J624 B4 J625 B4 J626 A4 J627 B4 J628 B4 J629 B4 J630 B4 J631 A3 J632 A4 J633 A2 J634 B2 J635 B2 J636 B2 J637 B2 J661 C2 J662 C1 J663 D3 J664 D3 J665 C2 J666 C3 J667 C3 J...

Page 32: ...Mar 2004 Printed in Korea P NO 3828VD0128F ...

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