LG FLATRON W1946P-BFW Service Manual
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LG FLATRON W1946P-BFW Service Manual

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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.
Website:http://biz.LGservice.com
W1946P(W1946P-BFW)
Internal Use Only

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Summary of Contents for LG FLATRON W1946P-BFW

  • Page 1 Internal Use Only Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM84K MODEL: W1946P(W1946P-BFW) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    : 56 ~ 75Hz 8. WEIGHT (with TILT/SWIVEL) Net. Weight 3.7 kg (8.22 lbs) Gross Weight : 5.7 kg (12.66 lbs) Copyright 2007 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...
  • Page 3 +5V Power Ground (return for +5V, H. Sync. and V. Sync.) T. M. D. S. (Transition Minimized Differential Signaling) Copyright 2007 LG Electronics. Inc. All right reserved. - 3 - 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 2007 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 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. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 IC. circuit board to prevent excessive component temperatures. Copyright 2007 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7 Solder the overlapped area and clip off any excess jumper wire. Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: 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. - 8 - LGE Internal Use Only Only for training and service purposes...

  • Page 9: Disassembly

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

  • Page 10: Block Diagram

    BLOCK DIAGRAM Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - 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 EEPROM. Copyright 2007 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only...
  • Page 12 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. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: 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. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14 (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. - 14 - LGE Internal Use Only Only for training and service purposes...

  • Page 15: Troubleshooting Guide

    IC601 (1.8V) LINE IC601 PIN2(1.8V) CHECK U501 PIN96 CHECK CRYSTAL(X501) PULSE CHECK U501 Waveforms J703 -#5,6 IC601-#2 IC601-#2 U501-#96 Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...
  • Page 16 WIRE OF THE LCD MODULE Waveforms J703-#5,6 J703#9 REPLACE LCD MODULE J703-#10 (Brightness 100) J703-#10 (Brightness 0) LAMP CURRENT Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...
  • Page 17 PIN28(V-SYNC). FROM D-SUB TO U501 IS PULSE APPEARED AT SIGNAL PINS? TROUBLE IN CABLE OR LCD MODULE Waveforms U501-#96 Copyright 2007 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 APPEARED? CHECK U501 PIN 27.28 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. - 18 - LGE Internal Use Only Only for training and service purposes...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 23 NOV. 2010 P/NO : MFL66100812 Printed in China...

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