LG Flatron W1942S Service Manual
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LG Flatron W1942S Service Manual

Color monitor
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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : LM57G
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
W1942S(W1942S-PFT.A***QF)
Internal Use Only

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Summary of Contents for LG Flatron W1942S

  • 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. : LM57G W1942S(W1942S-PFT.A***QF) MODEL: ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    : 3.25 kg (7.22 lbs) Horizontal : 30 ~ 83kHz Gross Weight : 4.55 kg (10.11 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: 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. - 4 - Copyright 2007 LG Electronics. Inc. All right reserved. 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

    59.90 H(Pixels) 106.500 55.935 1904 1440 1440x 900 V(Lines) 59.887 H(Pixels) 136.750 70.635 1936 1440 1440x 900 V(Lines) 74.984 Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Disassembly

    Please pull off the latch first. Then separate stand body and base cover. - 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: Service Osd

    (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection - 13 - Copyright 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Troubleshooting Guide

    IS U602 PIN3(3.8V) U601(3.3V) LINE U601 PIN3(3.3V) CHECK U501 PIN108 CHECK CRYSTAL(X501) PULSE CHECK U501 Waveforms J703-#5,6 U602-#2 U601-#2 U501-#108 Copyright 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 POWER BOARD (LIPS) TO THE LAMP WIRE OF THE LCD MODULE REPLACE LCD MODULE Waveforms J703-#5,6 J703-#10 LAMP CURRENT Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 PIN28(V-SYNC). FROM D-SUB TO U501 IS PULSE APPEARED AT SIGNAL PINS? TROUBLE IN CABLE OR LCD MODULE Waveforms U501-#108 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 PIN27,28 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 EAD37414503 EAD42157802 66631900030H 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 20 EAJ36290801 LCD,Module-TFT, LM190WX1-TLC1 DRIVER 19INCH 1440X900 300CD COLOR 72% 16/10 850:1 5ms, MAGNA source D-IC, OKI gate D-IC, TLI T-con, 160/160, P7 LG PHILIPS LCD or EAJ36290802 LCD,Module-TFT, LM190WX1-TLC2 DRIVER 19INCH 1440X900 300CD COLOR 72% 16/10 850:1 P7,5ms,Non-ZBD,MAGNA source D-IC, OKI gate D-IC, TLI T-con, 160/160 LG PHILIPS LCD EBR41617001 PCB Assembly, CONTROL T.T LM73A BAIKAL 3 19-INCH RD -...

  • Page 25: Schematic Diagram

    MAR. 2008 P/NO : MFL32179251 Printed in China...

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Flatron w1941s(w1941s-pft.a***qf)

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