LG Flatron W1946S Service Manual
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LG Flatron W1946S Service Manual

Color monitor
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM84K
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
W1946S(W1946S-BFW)
Internal Use Only
Website:http://biz.LGservice.com

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  • Page 1: Specifications

    Internal Use Only Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM84K MODEL: W1946S(W1946S-BFW) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    8. WEIGHT (with TILT/SWIVEL) Vertical : 56 ~ 75Hz 3.0 kg (6.66 lbs) Net. Weight Gross Weight 5.0 kg (11.11 lbs) 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. 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 1024 78.75 V(Lines) 75.029 H(Pixels) 47.712 1792 1360 1360 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

    1. Pull the front cover upward. Disassemble back cover. 2. Then, let the all latches are separated. 3. Put the front face down. - 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 Panel D-SUB AC input Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...

  • Page 10: 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 FLASH ROM. Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only...

  • Page 11: Lips Board 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 Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...

  • Page 14: Troubleshooting Guide

    IS IC1 PIN1(3.3V) IC1(1.8V) LINE IC1 PIN4(1.8V) CHECK U201 PIN1 CHECK CRYSTAL(X501) PULSE CHECK U201 Waveforms P605-#5,6 IC1-#2 IC-#2 U201-#1 Copyright 2007 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only Only for training and service purposes...
  • Page 15 WIRE OF THE LCD MODULE Waveforms P605-#5,6 P605-#9 REPLACE LCD MODULE P605-#10 (Brightness 100) P605-#10 (Brightness 0) LAMP CURRENT Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 PIN17(V-SYNC). FROM D-SUB TO U201 IS PULSE APPEARED AT SIGNAL PINS? TROUBLE IN CABLE OR LCD MODULE Waveforms U201-#1 Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 APPEARED? CHECK U201 PIN 16,17 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN U201 Waveforms 1 H-SYNC 2 V-SYNC Copyright 2007 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 22 Jan.2010 P/NO : MFL61926869 Printed in China...

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