LG Flatron W1943S-V Series Service Manual
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LG Flatron W1943S-V Series Service Manual

Color monitor chassis no. : lm92c
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM92C
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
W1943S(W1943S-**V)
Internal Use Only

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  • Page 1: Specifications

    Internal Use Only Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM92C W1943S(W1943S-**V) MODEL: ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    : 2.5 kg (5.62 lbs) Horizontal : 30 ~ 83kHz Gross Weight : 4.3 kg (9.56 lbs) Vertical : 56 ~ 75Hz Copyright 2007 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precautions

    CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. Copyright 2007 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4 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 2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 IC. circuit board to prevent excessive component temperatures. Copyright 2007 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 Solder the overlapped area and clip off any excess jumper wire. Copyright 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Timing Chart

    65.0 V(Lines) 60.0 H(Pixels) 60.123 1312 1024 1024x768 78.75 V(Lines) 75.029 H(Pixels) 47.712 1792 1360 1360x768 85.5 V(Lines) 60.015 Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Disassembly

    Remove the control button from cabinet, Then disassemble the connector. Separate the lamp shield from rear shield. Please pull off the latch first. - 8 - Copyright 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Block Diagram

    BLOCK DIAGRAM Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 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 EEPROM. Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only...

  • Page 11: Description Of Block Diagram

    This part function is to collect the any change from the DC output and feed back to the primary through photo transistor. Copyright 2007 LG Electronics. Inc. All right reserved. - 11 - 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 2007 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13 (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Troubleshooting Guide

    CHECK U901 PIN2 CHECK U901(3.3V) LINE (3.3V) CHECK U501 PIN127,128 CHECK CRYSTAL(X501) PULSE CHECK U501 Waveforms J300-#3 U901-#3 U901-#3 U901-#2 Copyright 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 ADAPTER TO THE LAMP WIRE OF THE LAMP CURRENT LCD MODULE REPLACE LCD MODULE Waveforms J300-#3 U901-#3 Q501-#C U501-#117 Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 PIN42(V-SYNC). FROM D-SUB TO U501 IS PULSE APPEARED AT SIGNAL PINS? TROUBLE IN CABLE OR LCD MODULE Waveforms U501-#127 Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 INTO DPM MODE APPEARED? CHECK U501 PIN41,42 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN U501 Waveforms 1 H-SYNC 2 V-SYNC Copyright 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM EAD57188304 ADAPTER MAIN BORAD 6631P00011K Copyright 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 24 FEB. 2009 P/NO : MFL61926821 Printed in China...

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