LG Flatron E1908s Service Manual
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LG Flatron E1908s Service Manual

LG Flatron E1908s Service Manual

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COLOR MONITOR
SERVICE MANUAL
MODEL:
LCM190A1L0G )
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
All manuals and user guides at all-guides.com
E1908s
( E1908s-PNT.A**DAS for
**Sales Market
- 1 -
North/Latin America
Europe/Africa
Asia/Oceania
*To apply the Realtek Chip.
LGE Internal Use Only
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com

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  • Page 1 **Sales Market CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the Realtek Chip. Copyright © 2010 LG Electronics. Inc. All right reserved. - 1 - LGE Internal Use Only Only for training and service purposes...

  • Page 2: Table Of Contents

    2) Voltage Level: 0.7 Vp-p 3) Input impedance: 75 Ω 8. WEIGHT (excl. packing) Weight: 3.10 kg (6.82 lb) 3-3. Operating Frequency Copyright © 2010 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...

  • Page 3: Precautions

    All manuals and user guides at all-guides.com   Copyright © 2010 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4 All manuals and user guides at all-guides.com   Copyright © 2010 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5 All manuals and user guides at all-guides.com   Copyright © 2010 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6 All manuals and user guides at all-guides.com   Copyright © 2010 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...

  • Page 7: Timing Chart

    1024 x 768 60.023 75.029 1280 x 1024 63.981 60.020 1280 x 1024 79.976 75.025 1440 x 900 55.935 59.887 Copyright © 2010 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...

  • Page 8: Disassembly

    Disassemble the LVDS cable and tear the aluminum Unscrew the 6 screws to remove the main board, foils. the power board and the adapter board. Copyright © 2010 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9 The mainframe. Disconnect the marked cables from the boards. Unscrew the 4 screws to remove the bezel. The panel. Copyright © 2010 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10 Directly remove the stand cover by hand. Unscrew the 3 screws to remove the hinge and the Stand cover, stand and hinge. stand. Copyright © 2010 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...

  • Page 11: Block Diagram

    CN406 to Panel sequence SCALAR RTD2271-GR control circuit Block Q705 Q706 3.3V 1.2V CAPACITOR U701 U703 Power input CN701 Copyright © 2010 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 Photo coupler (IC902) ZD801 14.5V L801 MOSFET (Q801) (CN802) PWM Control TA9690GN (IC801) PWM Control TA9690GN (IC802) (CN803) Copyright © 2010 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...

  • Page 13: Discription Of Block Diagram

    The Micom distinguishes polarity and frequencies of the H/V sync are supplied from signal cable. The controlled data of each mode is stored in scalar. Copyright © 2010 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only...

  • Page 14: Adjustment

    “PASS”, it means record succeeds ,the red “Fail” means record fails; Then check the power supply and signal line, and ensure they are connected well ,then do DDC record again from the third step. Copyright © 2010 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only...
  • Page 15 All manuals and user guides at all-guides.com   Fig.2 Copyright © 2010 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only Only for training and service purposes...

  • Page 16: Service Mode

    Panel Sel: TPVTPM190AWXGA Connect to Connect to the PC the monitor   Figure 1 Cable Connection for Micom uploading Copyright © 2010 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only Only for training and service purposes...

  • Page 17: Troubleshooting Guide

    =1.2V U703, and U701 U701 PIN2=3.3V Check X401 oscillate Replace X401 waveforms are normal   Replace U401   Copyright © 2010 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18 3. Trouble in Scaler IC   Check BL ON/OFF pulse as Check CN701 Contacting scope PIN 6 =5V? LIPS Copyright © 2010 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19 D-SUB to Scaler pin 22 H Sync ? pin 21 V Sync? Trouble in cable or LCD module Copyright © 2010 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 22 H Sync? Check H/V sync line pin 21 V Sync? Trouble in cable or LCD module Copyright © 2010 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 CN801=14.5V?     Check V =50V? Check L801,ZD801,F801   Check main board Check main board   Replace panel Copyright © 2010 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 Check ON/OFF signal main board   Check DIM   Check U401   Check PANEL_VCC Check C141, C142   Copyright © 2010 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...

  • Page 23: Wiring Diagram

    All manuals and user guides at all-guides.com   WIRING DIAGRAM Copyright © 2010 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...

  • Page 24: Exploded View

    It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright © 2010 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only...
  • Page 25 A34G1407AED 1B0130 MCK66558401 BASE TSS1 089G414A15N YH AC POWER CORD 089G 725CAA 2G D-SUB CABLE S89G179T30N518 COV30101421 FFC CABLE Copyright © 2010 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...

  • Page 26: Schematic Diagram

    VCC3.3 VCC3.3 V12S V12S VGA_5V VGA_5V DVI5V DVI5V 04_SCALER DVI5V D-SUB I/O VGA_5V DVI5V VGA_5V 02_D-SUB I/O 03_DVI Copyright © 2010 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 27 NC/22pF 50V 22pF 50V 22pF 50V NC/22pF 50V DDCSCL_A VSIN0 DET_VGA GIN0 C113 C114 100N16V 100N16V AOZ8902CIL AOZ8902CIL Copyright © 2010 LG Electronics. Inc. All right reserved. - 27 - LGE Internal Use Only Only for training and service purposes...
  • Page 28 DAT5+ DAT5- DCLK+ R137 RXC+ 5 clk+ DCLK- R138 RXC- 5 clk- U106 U107 ESD_DVI ESD_DVI C118 C119 Copyright © 2010 LG Electronics. Inc. All right reserved. - 28 - LGE Internal Use Only Only for training and service purposes...
  • Page 29 NC/CONN R465 R463 220K 1/16W 5% 220K 1/16W 5% R466 Q401 Q403 V33P C150 R452 R468 SOG_TO_ADC R469 Copyright © 2010 LG Electronics. Inc. All right reserved. - 29 - LGE Internal Use Only Only for training and service purposes...
  • Page 30 RXE2- RXE2+ RXOC- RXOC+ RXE3- RXE3+ CN406 C141 C142 100N16V NC/CONN 100uF16V RXOC- RXOC- C143 C144 RXOC+ RXOC+ Copyright © 2010 LG Electronics. Inc. All right reserved. - 30 - LGE Internal Use Only Only for training and service purposes...
  • Page 31 R716 0.22UF 16V PMBS3904 R714 C717 10K 1/16W 5% 0.22UF 16V R718 C716 10K 1/16W 5% NC/10uF 10V Copyright © 2010 LG Electronics. Inc. All right reserved. - 31 - LGE Internal Use Only Only for training and service purposes...
  • Page 32 SOCKET BEAD +14.5V DIM_INPUT ON/OFF_INPUT MUTE DIM_OUTPUT ON/OFF_OUTPUT C917 CONN GND1 GND2 GND3 100N 50V CN903 Wire Harness Copyright © 2010 LG Electronics. Inc. All right reserved. - 32 - LGE Internal Use Only Only for training and service purposes...
  • Page 33 R624 NC R623 0R05 1/10W +5V1 R626 R627 DIM_INPUT Q622 R625 BKLT-EN PANEL DIM_OUTPUT R629 NC R628 0R05 1/10W Copyright © 2010 LG Electronics. Inc. All right reserved. - 33 - LGE Internal Use Only Only for training and service purposes...
  • Page 34 R816 120KOHM 1/10W IC802 1K 1/10W 5% R818 R817 10K 1/10W 5% TA9690GN C809 2.2U16V R819 100K 1/10W 5% Copyright © 2010 LG Electronics. Inc. All right reserved. - 34 - LGE Internal Use Only Only for training and service purposes...
  • Page 35 All manuals and user guides at all-guides.com   Sep.2010 P/NO: Printed in China Copyright © 2010 LG Electronics. Inc. All right reserved. - 35 - LGE Internal Use Only Only for training and service purposes...

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