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LG Flatron E1942S Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : LM12A
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
E1942S
(E1942S-**A)
Internal Use Only

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  Summary of Contents for LG Flatron E1942S

  • Page 1: Color Monitor

    Internal Use Only Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM12A MODEL: E1942S (E1942S-**A) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2 Recommended Troubleshooting & Repairing Guide: V1.0- Collection of LCD V2.0- LCD TV Repair TV Repair Tips Tips & Case Histories LCD/LED & 3D TV Plasma & 3D TV Repair Membership Site Repair Membership Site Projection TV & Troubleshooting & DLP/LCD Projector Repairing LCD TV Repair Membership Site Guide...
  • Page 3: Table Of Contents

    : 30 ~ 61kHz Vertical : 56 ~ 75Hz : 2.1 kg (4.62 lbs) Net. Weight : 3.2kg (7.04 lbs) Gross Weight Copyright 2010 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...
  • Page 4: Precautions

    CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. Copyright - 3 - 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5: Servicing Precautions

    8. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. Copyright 2010 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 IC. circuit board to prevent excessive component temperatures. Copyright 2010 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 Solder the overlapped area and clip off any excess jumper wire. Copyright 2010 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 8: Timing Chart

    H(Pixels) 60.023 1312 1024 78.75 1024 x 768 V(Lines) 75.029 H(Pixels) 47.712 1792 1366 85.5 1366 x768 V(Lines) 59.79 Copyright 2010 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 9: Disassembly

    1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Disassemble back cover. 2010 LG Electronics. Inc. All right reserved. Copyright LGE Internal Use Only Only for training and service purposes...
  • Page 10: Block Diagram

    BLOCK DIAGRAM Copyright 2010 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 11: Description Of Block Diagram

    The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable. The controlled data of each modes is stored in. Copyright 2010 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 12: Adjustment

    Click “ Write” button c) Remove all default number d) Add 300-3FF e) Click Start button. f) Click Exit button. Copyright 2010 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 13: Copyright 2010 Lg Electronics. Inc. All Right Reserved

    (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection Copyright 2010 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 14: Troubleshooting Guide

    CHECK CRYSTAL(X100) PULSE CHECK IC103 Waveforms IC102 PIN3 (5V) IC103 PIN27 (1.2V) IC103 PIN 25 (3.3V) IC103 PIN42,43 1.2V Copyright 2010 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 3. TROUBLE IN IC103 CHECK CHECK CONNECTION LINE IC103 PIN36(V-SYNC) FROM D-SUB TO IC103 And PIN35(H-SYNC) TROUBLE IN CABLE OR LCD MODULE Copyright 2010 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 INTO DPM MODE CHECK IC103 PIN35,36 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN IC103 Waveforms 1 H-SYNC 2 V-SYNC Copyright 2010 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 17: Wiring Diagram

    WIRING DIAGRAM AUO:EAD61905268 CMI:EAD61905281 MAIN BOARD EAD61426311 EAD38438703 6631900011S Copyright 2010 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 2010...
  • Page 19 PDF created with pdfFactory Pro trial version www.pdffactory.com...
  • Page 20 PDF created with pdfFactory Pro trial version www.pdffactory.com...
  • Page 21 JANUARY.2012 P/NO : Printed in China MFL67122126...