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LG Flatron L1742P Service Manual
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LG Flatron L1742P Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM72A
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
AUTO/SET
VOLUME
Website:http://biz.LGservice.com
L1742P (L1742P-*FT.A***QPN)
L1942P(L1942P-*FT.A***QPN)
Internal Use Only
*To apply the MSTAR Chip .

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Summary of Contents for LG Flatron L1742P

  • Page 1 Internal Use Only Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM72A MODEL: L1742P (L1742P-*FT.A***QPN) L1942P(L1942P-*FT.A***QPN) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. AUTO/SET VOLUME *To apply the MSTAR Chip .

  • Page 2: Table Of Contents

    : 5.37 kg (11.93lbs) Gross Weight L1942P : 4.23 kg (9.40 lbs) Net. Weight : 5.94 kg (13.20lbs) Gross Weight LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 2 - 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. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 3 - 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. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 4 - Only for training and service purposes...
  • Page 5 IC. circuit board to prevent excessive component temperatures. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 5 - Only for training and service purposes...
  • Page 6 Solder the overlapped area and clip off any excess jumper wire. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 6 - Only for training and service purposes...

  • Page 7: Timing Chart

    1280 x 1024 V(Lines) 60.02 1066 1024 H(Pixels) 135.0 79.976 1688 1280 1280 x 1024 V(Lines) 75.035 1066 1024 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 7 - Only for training and service purposes...

  • Page 8: Disassembly

    1.Pull the front cover upward Disassemble back cove. 2.Then,let the all latches are separated. 3.Put the front face down. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 8 - Only for training and service purposes...

  • Page 9: Copyright 2007 Lg Electronics. Inc. All Right Reserved

    Push the two latches on the bottom to the inside. (Reference the #1-2) Separate stand body form the stand base . LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - Only for training and service purposes...

  • Page 10: Block Diagram

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

  • Page 12: Discription 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. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 12 - Only for training and service purposes...

  • Page 13: Copyright 2007 Lg Electronics. Inc. All Right Reserved

    This part function is to collect the any change from the DC output and feed back to the primary through photo transistor. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - Only for training and service purposes...

  • Page 14: Adjustment

    Click “ Write” button c) Remove all default number d) Add 300-3FF e) Click Start button. f) Click Exit button. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 14 - Only for training and service purposes...

  • Page 15: Service Osd

    (110V/220V) Power LED 74LS06 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1. Cable Connection LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 15 - Only for training and service purposes...

  • Page 16: Troubleshooting Guide

    Is U201 Pin75 (3.3V) Check 3.3V Line Voltage ? Check U201 Pin 96 Check X-TAL Pulse Check U501 Waveforms U201-#96 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 16 - Only for training and service purposes...
  • Page 17 (CONTACT PROBE TO CAUTION LABEL. CAN YOU SEE PULSE AT YOUR SCOPE? REPLACE CCFL LAMP IN THE LCD MODULE LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 17 - Only for training and service purposes...
  • Page 18 AT SIGNAL PINS? AT MODE 12? TROUBLE IN CABLE OR LCD MODULE Waveforms U201-#96, 97 U201-#27 H-SYNC U201-#28 V-SYNC LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 18 - Only for training and service purposes...
  • Page 19 INTO DPM OFF MODE CHECK U201 PIN 27,28 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U501 Waveforms R730 H-Syn R731V-Sync LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 19 - Only for training and service purposes...
  • Page 20 Check Q101 Drain Trouble in Q101 Waveform Check D201, D202 Trouble in D201, D202,D203 D203,Voltage CHECK 5V, 15V Line LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 20 - Only for training and service purposes...
  • Page 21 If waveform is no problem Check D302~D308 Check U303, U304 Or Trouble in U303, U304 Drain waveform CHECK T301 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 21 - Only for training and service purposes...

  • Page 22: Wiring Diagram

    WIRING DIAGRAM EAD37413101 EAD42157802 6631900011J LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 22 - Only for training and service purposes...

  • Page 24: Exploded View

    MEY42882101 Control button MOLD ABS HF-350 MAIN 5 Lx42 Lx42 BLACK MFB42881801 Led Lens MOLD PC LG LENS Lx42 Lx42 Lens EBR37001507 CONTROL T.T LM72A BAIKAL ? 19-INCH BLUE RD 42 SERIAL MCK42876810 Back cover MOLD HIPS LPL DUAL TILT...

  • Page 25: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. -25- Only for training and service purposes...
  • Page 26 2. POWER & WAFER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 26 - Only for training and service purposes...
  • Page 27 3. INVERTER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 27 - Only for training and service purposes...
  • Page 28 4. POWER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 28 - Only for training and service purposes...
  • Page 29 JUN. 2008 P/NO : MFL40349711 Printed in China...

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Flatron l1942p

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