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LG 42PT85-ZB Service Manual

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PLASMA TV
SERVICE MANUAL
CHASSIS : PD74A
MODEL : 42PT85
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Internal Use Only
website:http://biz.LGservice.com
42PT85-ZB

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Summary of Contents for LG 42PT85-ZB

  • Page 1 Internal Use Only website:http://biz.LGservice.com PLASMA TV SERVICE MANUAL CHASSIS : PD74A MODEL : 42PT85 42PT85-ZB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    BLOCK DIAGRAM .....................26 EXPLODED VIEW ....................28 EXPLODED VIEW PARTS LIST ................29 REPLACEMENT PARTS LIST................30 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

    LGE SPEC. 2)Humidity : 20~80% Storage Environment 3)Temp. : -20~60deg 4)Humidity : 10~90% Input Voltage 100-240V~, 50/60Hz Maker : LG Copyright©2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 Y/Cb/Cr, Y/Pb/Pr RGB Input RGB-PC RGB-DTV HDMI Input(2EA) HDMI-PC 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 - System control RS-232 Host should be “PC“ for adjustment. - 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 15 minutes. 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 FULL DYNAMIC Range and 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 Tool option2 Suffix 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

    11. Check the Y B/D 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 RL-ON 3.4V STBY 5V Vs-ON 5V Det M5V-ON 3.4V STBY 5V 3.4V-ON Wafer P/N YH396-03V SMW250-13P SMW250-10P SMW250-12P YH396-08V YH396-09V Copyright©2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 3.4V RL-ON 3.4V STBY 5V Vs-ON 5V Det M5V-ON 3.4V STBY 5V 3.4V-ON YH396-03V SMW250-13P SMW250-10P Description SMW250-12P YH396-08V YH396-09V Copyright©2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 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. - 16 - LGE Internal Use Only...
  • Page 17 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. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 Check the PDP Module 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. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 Replace the VSC B/D normal? 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. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 Are the Input voltage, IIC Is the CXA2069Q normal? Replace the IC. Communication and HV sync 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 (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. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Is the IC1301 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. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 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. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 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. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 IC(IC1504) normally? (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. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Block Diagram

    BLOCK DIAGRAM Copyright©2007 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 MEMO Copyright©2007 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...

  • Page 28: Exploded View

    EXPLODED VIEW Copyright©2007 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...

  • Page 29: Exploded View Parts List

    Cover, MOLD ABS 42PC5 ABS CABLE MANAGEMENT MKJ39170801 Remote Controller, COMPLEX PP79A 32/37/42LB5RT-TB ,42/50/60PB4RT-TB H4 ANALOG PVR R/C 3550V00590A Cover, MOLD ABS BATTERY TN-50PY20 ABS 6710V00142 Copyright©2007 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...

  • Page 30: 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. LGE Internal Use Only - 30 - Only for training and service purposes...
  • Page 31 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. LGE Internal Use Only - 31 - Only for training and service purposes...
  • Page 32 0CK104BF56A 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. LGE Internal Use Only - 32 - Only for training and service purposes...
  • Page 33 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. LGE Internal Use Only - 33 - Only for training and service purposes...
  • Page 34 C1005X7R104KET 100nF 10% 16V X7R C411 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C603 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R - Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 34 - Only for training and service purposes...
  • Page 35 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C721 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C778 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 35 - Only for training and service purposes...
  • Page 36 0CK104CK56A 0603B104K500CT 100nF 10% 50V X7R C868 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R C869 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 36 - Only for training and service purposes...
  • Page 37 AT24C02BN-SH-T 2KBIT 256x8BIT 1.8 IC801 0IMMRIH038B HYB25D(C)256160CE-5 256MBIT 4MX16 IC1003 0IMMRAL014D AT24C02BN-SH-T 2KBIT 256x8BIT 1.8 IC804 0IPMG78391A SC2595STR 2.3TO5V 0 0W SOIC R/TP Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 37 - Only for training and service purposes...
  • Page 38 2SC3875S(ALY) NPN 5V 60V 50V 150M L1904 6210TCE001G Filter, HH-1M3216-501JT 500OHM 3.2X1.6X1. Q1000 0TRIH80003A RT1N141C-T112-1 NPN 10V 50V 50V 1 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 38 - Only for training and service purposes...
  • Page 39 MNR04M0ABJ330 33OHM 5% 1/16W 4 SM Q907 0TRIY80001A 2SC3052 NPN 6V 50V 50V 200MA 100N AR310 0RZZH033273 MNR04M0ABJ330 33OHM 5% 1/16W 4 SM Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 39 - Only for training and service purposes...
  • Page 40 MCR01MZPJ000 0OHM 5% 1/16W 1005 R R1040 0RJ4702C678 MCR01MZPJ473 47KOHM 5% 1/16W 1005 R1131 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 40 - Only for training and service purposes...
  • Page 41 0RJ0472C678 MCR01MZPJ470 47OHM 5% 1/16W 1005 R1223 0RJ2203C678 MCR01MZPJ224 220KOHM 5% 1/16W 100 R1290 0RJ0822C678 MCR01MZPJ820 82OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 41 - Only for training and service purposes...
  • Page 42 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R1354 0RJ0122D677 MCR03EZPJ120 12OHM 5% 1/10W 1608 R1429 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 42 - Only for training and service purposes...
  • Page 43 MCR18EZHJ00 0OHM 5% 1/4W 3216 R/T R1527 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 R1654 0RJ0000G676 MCR18EZHJ00 0OHM 5% 1/4W 3216 R/T Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 43 - Only for training and service purposes...
  • Page 44 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R1747 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R192 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 100 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 44 - Only for training and service purposes...
  • Page 45 MCR01MZPJ000 0OHM 5% 1/16W 1005 R R217 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R315 0RJ0472C678 MCR01MZPJ470 47OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 45 - Only for training and service purposes...
  • Page 46 0RJ0752C678 MCR01MZPJ750 75OHM 5% 1/16W 1005 R503 0RJ1002C678 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R631 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 46 - Only for training and service purposes...
  • Page 47 0RJ1002C678 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R734 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R813 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 47 - Only for training and service purposes...
  • Page 48 MCR01MZPJ103 10KOHM 5% 1/16W 1005 R934 0RJ3302C678 MCR01MZPJ333 33KOHM 5% 1/16W 1005 R935 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 48 - Only for training and service purposes...
  • Page 49 Bag, COMPLEX VINYL 180*150 0.58 H&C MODEL 4950TKA320A Plate, PRESS SBHG T1.2 SUPPORT UPSET FAB30021701 Screw, Machine 1SZZVMR001A RING WALL 5MM 25MM Copyright©2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 49 - 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 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 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 55 Sep., 2007 P/NO : MFL38616703 Printed in Korea...

This manual is also suitable for:

42pt85