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LG E1941S Service Manual

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COLOR MONITOR

SERVICE MANUAL

MODEL: E1941S (E1941S-BNT.A**TOV for AUO M185XW01 VD0A;
E1941S-BNT.A**NOV for LGD LM185WH2-TLA1) **Sales Market
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
                                                                                                                                                              *To apply the Novatek Chip. 
Copyright © 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
North/Latin America
Europe/Africa
Asia/Oceania
- 1 -
Internal Use Only
http://aic.lgservice.com
http://eic.lgservice.com
http://biz.lgservice.com
LGE Internal Use Only
 
       

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  Summary of Contents for LG E1941S

  • Page 1: Color Monitor

                                                                                                                                                                  *To apply the Novatek Chip.  Copyright © 2011 LG Electronics. Inc. All right reserved.
  • Page 2: Table Of Contents

    3) Input impedance: 75 Ω 8. WEIGHT (excl. packing) Weight: 2.8kg 3-2. Operating Frequency Horizontal: 30 ~ 61 kHz Copyright © 2011 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...
  • Page 3: Precautions

      Copyright © 2011 LG Electronics. Inc. All right reserved. - 3 - LGE Internal Use Only Only for training and service purposes...
  • Page 4: Only For Training And Service Purposes

      Copyright © 2011 LG Electronics. Inc. All right reserved. - 4 - LGE Internal Use Only Only for training and service purposes...
  • Page 5: Only For Training And Service Purposes

      Copyright © 2011 LG Electronics. Inc. All right reserved. - 5 - LGE Internal Use Only Only for training and service purposes...
  • Page 6: Only For Training And Service Purposes

      Copyright © 2011 LG Electronics. Inc. All right reserved. - 6 - LGE Internal Use Only Only for training and service purposes...
  • Page 7: Timing Chart

    60.123 1312 1024 78.75 1024 x 768 V(Lines) 75.029 H(Pixels) 47.712 1792 1366 85.5 1366 x768 V(Lines) 60.015 Copyright © 2011 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
  • Page 8: Disassembly

        Use hands to open all latches.   Put the front face down, disassembly back cover.   Copyright © 2011 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
  • Page 9: Only For Training And Service Purposes

    Unscrew the screws on power board.     Unscrew the screw on main board. Remove the bezel.   Copyright © 2011 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
  • Page 10: Only For Training And Service Purposes

    Rear cover and BRACKET.     Stand and hinge.   Disassemble the stand and hinge. Hinge and stand. Copyright © 2011 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
  • Page 11: Block Diagram

    Brightness control To Power Block SCALAR NT68168AFG LVDS output Panel Power sequence CN405 to Panel control circuit Block Q405 Copyright © 2011 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
  • Page 12 MOSFET Transformer Connector (Q801) (ZD801) (CN803) 16V transfer to PWM Control 5V for IC801 Feedback Circuit TA9690GN (IC801) Copyright © 2011 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
  • Page 13: Only For Training And Service Purposes

    Boost Circuit OVP circuit Current balance ON/OFF Control IC ON/OFF circuit Feedback OZ9998BGN Current circuit Feedback DIM circuit Copyright © 2011 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only Only for training and service purposes...
  • Page 14: 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 © 2011 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only...
  • Page 15: Only For Training And Service Purposes

    5. OVP circuit: set the maximum output voltage of OVP, through this voltage IC can neglect the OPEN’s string. 6. Current feedback: LED feedback current detection. Copyright © 2011 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only...
  • Page 16: 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 © 2011 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only...
  • Page 17     Fig.2 Copyright © 2011 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
  • Page 18: Service Mode

    R/G/B-sRGB: Allows you to set the R/G/B- sRGB value manually. Connect to the PC Connect to the monitor   Figure 1 Cable Connection for Micom uploading Copyright © 2011 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
  • Page 19: Troubleshooting Guide

    Check CN404 or replace =3.3V U701   Check X401 oscillate Replace X401 waveforms are normal   Replace U401   Copyright © 2011 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
  • Page 20 Check C701,C702,C703 PIN 2 =3.3V? Check BL ON/OFF pulse as Check CN404 contacting scope PIN 6 =5V? LIPS Copyright © 2011 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
  • Page 21 D-SUB to Scalar pin 14 H Sync ? pin 15 V Sync? Trouble in cable or LCD module Copyright © 2011 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
  • Page 22 14 H Sync? Check H/V sync line pin 15 V Sync? Trouble in cable or LCD module Copyright © 2011 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
  • Page 23 Vcc is 30V?   Check U901 PIN5 Check D907, Q901   output is PWM?   Check U901,T901,D901,D906,ZD901,Q904,U902,U903   Copyright © 2011 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
  • Page 24 Check R814,R832   volt?   Check CN803 Pin 5, Check Q801   6=51.2V   Check Panel connecter   Copyright © 2011 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
  • Page 25 Check U801   volt?   Check CN804 Pin 3, Check Q801   4=5V   Check Panel connecter   Copyright © 2011 LG Electronics. Inc. All right reserved. - 25 - LGE Internal Use Only Only for training and service purposes...
  • Page 26: Wiring Diagram

      WIRING DIAGRAM 095G176W 10V08   095G 825 9WE04   S95G80183H92   095G8014 7W621   Copyright © 2011 LG Electronics. Inc. All right reserved. - 26 - LGE Internal Use Only Only for training and service purposes...
  • Page 28: Schematic Diagram

    TPV MODEL 絬 隔 瓜 絪 腹 Key Component 1.0.COVER PCB NAME G3225-1-2 称爹 Tuesday , Nov ember 23, 2010 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 29 TPV MODEL 絬 隔 瓜 絪 腹 2.INPUT PCB NAME G3225-1-2 Key Component 称爹 Tuesday , Nov ember 23, 2010 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 3.SCALER PCB NAME G3225-1-2 称爹 Date Tuesday , Nov ember 23, 2010 Sheet Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 絬 隔 瓜 絪 腹 Key Component 4.PANEL INTERFACE PCB NAME G3225-1-2 称爹 Wednesday , Nov ember 24, 2010 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 TPV MODEL 絬 隔 瓜 絪 腹 Key Component 5.POWER PCB NAME G3225-1-2 称爹 Wednesday , Nov ember 24, 2010 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 絬 隔 瓜 絪 腹 ADPCA1503QX5 715G4497-P0C-001-0010 Key Component 01.POWER PCB NAME ODM MODEL 称爹 Monday , January 10, 2011 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 絬 隔 瓜 絪 腹 LNPCA8561LQBX Key Component 1.CONVERTER PCB NAME 715G4220 ODM MODEL 称爹 Saturday , February 12, 2011 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 絬 隔 瓜 絪 腹 PLPCAB531AAAU 715G4497-P0C-001-0010 Key Component 01.POWER PCB NAME ODM MODEL 称爹 Saturday , February 12, 2011 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 絬 隔 瓜 絪 腹 Key Component 02.INVERTER PCB NAME 715G4497-P0C-001-0010 ODM MODEL 称爹 Saturday , February 12, 2011 Sheet Date Copyright © 2011 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37   Feb.2011 P/NO: Printed in China Copyright © 2011 LG Electronics. Inc. All right reserved. - 38 - LGE Internal Use Only Only for training and service purposes...