LG 50PT85 Service Manual
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LG 50PT85 Service Manual

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PLASMA TV
SERVICE MANUAL
CHASSIS : PD74A
MODEL : 50PT85
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Internal Use Only
website:http://biz.LGservice.com
50PT85-ZB

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  • Page 1 Internal Use Only website:http://biz.LGservice.com PLASMA TV SERVICE MANUAL CHASSIS : PD74A MODEL : 50PT85 50PT85-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    BLOCK DIAGRAM .....................25 EXPLODED VIEW ....................26 EXPLODED VIEW PARTS LIST ................27 REPLACEMENT PARTS LIST................28 SCHEMATIC DIAGRAM..................PRINTED CIRCUIT DIAGRAM ................Copyright © 2007 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Safety Precautions

    An other abnormality exists that must be corrected before the receiver is returned to the customer. Copyright © 2007 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...

  • Page 4: Specifications

    2)Humidity : 0~85% Storage Environment 3)Temp. : -20~60deg 4)Humidity : 0~85% 100-240V~, 50/60Hz Input Voltage Maker : LG Copyright © 2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 RGB Input RGB-PC RGB-DTV HDMI-PC HDMI Input(2EA) HDMI-DTV & SOUND Audio Input(4EA) PC Audio, Component, AV(2EA) L/R Input Copyright © 2007 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...

  • Page 6: Adjustment Instructions

    1) If PCMCIA CARD works normally, normal signals display on screen. But it works abnormally, “No CA module” words display on screen. Copyright © 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 3) Set up S/W option. Repeat Number : 5 Device Address : A0 PageByte : 8 4) Power on the Set. Copyright © 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8 - Before AV ADC Calibration, execute the “Panel size selection“ => Detail EDID Options are below( , , , , -1, -2, -1, -2) Copyright © 2007 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only...
  • Page 9 2) Set the PSM to Dynamic mode in the Picture menu. 3) Press IN-START key on R/C for adjustment. (Fig.5) Color Bar signal Copyright © 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 Full White Pattern CA-210 Color ANALYZER TYPE : CA-210 RS-232C Communication (Fig.11) Auto AV(CVBS) Color Balance Test Pattern Copyright © 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11 DATA, one of R Gain / G Gain / B Gain should be kept on 80, and other two is controlled lowering from 80. Copyright © 2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only...
  • Page 12 DIGITAL AMP 1665 KE*L(Y)LMP 1921 KE*L(Y)LMP 1665 KE*FLMP 6) After changing the Tool option1,2, push the EXIT Key. Copyright © 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: Trouble Shooting Guide

    9. Check the Power Manufacture’s model Module output circuit Module output circuit Board Output high passage tension circuit Copyright © 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 3.4V STBY 5V Vs-ON 5V Det 3.4V M5V-ON STBY 5V 3.4V-ON YH396-04V Description YH396-03V SMW250-13P SMW250-10P SMW250-12P YH396-10V Copyright © 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 After removing the cables, connect them to the Power Board(except the SC101 connection cable), and change the AC voltage marking to manual. When ST-BY 5V does not operate, replace the Power Board. Copyright © 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only...
  • Page 16 After a COF crisis for each board, check the normal operation. For normal operation, normal ? corresponding COF failure means the module should be relaced. Copyright © 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only...
  • Page 17 Is the LVDC cable Reconnect the LVDS cable in P1901 normal? Is the IC700(FLI8548) Replace the VSC. Output normal? Copyright © 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 IC(IC700) operate? Replace the FIL8548 IC(IC700) Is the Ctrl Board of Replace the Ctrl B/D. Module normal? Copyright © 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 5-2. In case there is no display on the screen in specific modes (1) Symptom 1) There is no screen display from a specific input mode (RF, AV, Component, RGB, DVI). (2) Procedure check 1) Check the all input modes have normal display. (3) In case of an unusual display in RF mode Are the Input voltage, IIC Communication Is the Tuner normal?
  • Page 20 (8) In case of an unusual display in SCART2 mode Is the Video input of the Check the input source A/V Jack(J1201) normal? Same as Block A Copyright © 2007 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 Replace the IC1300 for specific? CAX2069 refer to circuit diagram operating normally? (STA335BW) (except HDMI,DTV,RF) Replace the VSC B/D Copyright © 2007 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Replace the STI5100, NEC61151F, NEC64015A(IC1901) normally? NEC64015A normally? Change the time shift mode Replace the VSC B/D from off to on. Copyright © 2007 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 Connect speak cable Sound normally? Check the MSP(IC1300), Change the ICs Audio AMP(1301) normally? normally? Change the VSC B/D. Copyright © 2007 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 (P1500, P15101) Check the STI5100 IC(IC100), Connect.the cable NEC61151F(IC600), NEC64015A(IC1901) normally? Replace the VSC B/D Change the HDD normally? Copyright © 2007 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...

  • Page 25: Block Diagram

    BLOCK DIAGRAM Copyright © 2007 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Exploded View

    EXPLODED VIEW Copyright©2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...

  • Page 27: Exploded View Parts List

    AGU30996910 Plate Assembly, REAR AV Plate Cover Assy, LARGE, 42/50PT85-ZB, EUROPASS 3 CKD EBR38879912 Hand Insert PCB Assembly, MAIN2 M.I PD74A 50PT85-ZB . CKD 50PT85 MAIN2 HAND INSERT EBT38852912 Chassis Assembly, SUB PD74A CKD 50PT85 SUB PD74A HDD assembly EBR37674301 Hand Insert PCB Assembly, SUB M.I PD74A 42PT85-ZB .

  • Page 28: Replacement Parts List

    C1005X7R104KET 100nF 10% 16V X7R C1318 0CC560BK41A C1005C0G1H560JT 56pF 5% 50V C0G - C120 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 CS1005C0G240J400NR 24pF 5% 50V C0 C1378 0CH5470K618 0402N470M500LT 47pF 5% 50V C0G -5 C1508 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 C1005X7R104KET 100nF 10% 16V X7R C1631 0CK104CF56A 0603B104K160CT 100nF 10% 16V X7R C175 0CK103BH56A C1005X7R1E103KT- 10nF 10% 25V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 MVK4.0TP16VC10M 10uF 20% 16V 16MA C1934 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C1986 0CH5470K618 0402N470M500LT 47pF 5% 50V C0G -5 Copyright © 2007 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 MVK6.3TP16VC47M 47uF 20% 16V 80MA C411 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C565 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 C1005X7R104KET 100nF 10% 16V X7R C711 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C770 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 C3216X7R1C106KT 10uF 10% 16V X7R C861 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C983 0CK106EF56A C3216X7R1C106KT 10uF 10% 16V X7R Copyright © 2007 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 SAM2333 RED/Y-GREEN 2.7V 2.8V 30m 0DL233309AC SAM2333 RED/Y-GREEN 2.7V 2.8V 30m IC509 0IPMGRH001D BA15BC0FP-E2 3TO16V 1.5V 1.2W TO2 Copyright © 2007 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...
  • Page 36 Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. L1503 6210TCE001G Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. L606 0LCTA00003A Inductor, LEMC3225T6R8M 6.8UH 20% 50V 360MA Copyright © 2007 LG Electronics. Inc. All right reserved. - 36 - LGE Internal Use Only Only for training and service purposes...
  • Page 37 2SA1530A-T112-1R PNP -6V -60V -50 Q608 0TRIY80001A 2SC3052 NPN 6V 50V 50V 200MA 100N AR202 0RJ0222C687 RCA86TRJ22R0 22OHM 5% 1/16W 4 SMD Copyright © 2007 LG Electronics. Inc. All right reserved. - 37 - LGE Internal Use Only Only for training and service purposes...
  • Page 38 MCR01MZPJ470 47OHM 5% 1/16W 1005 R1024 0RJ6800D677 MCR03EZPJ681 680OHM 5% 1/10W 1608 R1120 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 100 Copyright © 2007 LG Electronics. Inc. All right reserved. - 38 - LGE Internal Use Only Only for training and service purposes...
  • Page 39 MCR01MZPJ473 47KOHM 5% 1/16W 1005 R1210 0RJ2203C678 MCR01MZPJ224 220KOHM 5% 1/16W 100 R128 0RJ0472C678 MCR01MZPJ470 47OHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 39 - LGE Internal Use Only Only for training and service purposes...
  • Page 40 MCR01MZPJ221 220OHM 5% 1/16W 1005 R1334 0RJ2200C678 MCR01MZPJ221 220OHM 5% 1/16W 1005 R1413 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R Copyright © 2007 LG Electronics. Inc. All right reserved. - 40 - LGE Internal Use Only Only for training and service purposes...
  • Page 41 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R1511 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R164 0RJ1202C678 MCR01MZPJ123 12KOHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 41 - LGE Internal Use Only Only for training and service purposes...
  • Page 42 MCR01MZPJ470 47OHM 5% 1/16W 1005 R1721 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 100 R1901 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 42 - LGE Internal Use Only Only for training and service purposes...
  • Page 43 MCR01MZPJ470 47OHM 5% 1/16W 1005 R204 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 0RJ0472C678 MCR01MZPJ470 47OHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 43 - LGE Internal Use Only Only for training and service purposes...
  • Page 44 MCR01MZPJ330 33OHM 5% 1/16W 1005 R438 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R R610 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 44 - LGE Internal Use Only Only for training and service purposes...
  • Page 45 MCR01MZPJ101 100OHM 5% 1/16W 1005 R702 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R R783 0RJ1002C678 MCR01MZPJ103 10KOHM 5% 1/16W 1005 Copyright © 2007 LG Electronics. Inc. All right reserved. - 45 - LGE Internal Use Only Only for training and service purposes...
  • Page 46 Wafer, 91932-31169LF 68P 1.00MM 1R STRAI R905 0RJ1801D677 MCR03EZPJ182 1.8KOHM 5% 1/10W 160 P100 6602T20009E Wafer, SMAW200-06P 6P 2.00MM 1R ANGLE DI Copyright © 2007 LG Electronics. Inc. All right reserved. - 46 - LGE Internal Use Only Only for training and service purposes...
  • Page 47 IC203 SAA31081413 S/W, Firmware 3.05 B215 EUROPE FLASH ROM IC802 SAA31081511 S/W, Firmware 3.04 AFB4 EUROPE FLASH ROM Copyright © 2007 LG Electronics. Inc. All right reserved. - 47 - LGE Internal Use Only Only for training and service purposes...
  • Page 48 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 PRINTED CIRCUIT BOARD MAIN(TOP) MAIN(BOTTOM) SIDE A/V SIDE A/V CONTROL Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Sep., 2007 P/NO : MFL38616704 Printed in Korea...

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