LG-Ericsson Flatron W1943C Service Manual
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LG-Ericsson Flatron W1943C Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : LM92C
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
W1943C (W1943C -**V)
Internal Use Only

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Summary of Contents for LG-Ericsson Flatron W1943C

  • Page 1: Specifications

    Internal Use Only Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM92C W1943C (W1943C -**V) MODEL: ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............13 PRECAUTIONS ............4 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............8 WIRING DIAGRAM ..........19 DISASSEMBLY ............9 EXPLODED VIEW...........20 BLOCK DIAGRAM ..........10 REPLACEMENT PARTS LIST .......22 DESCRIPTION OF BLOCK DIAGRAM....12 SCHEMATIC DIAGRAM ......... 26 SPECIFICATIONS 1.

  • Page 3: Precautions

    PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING • There are some special components used in LCD BE CAREFUL ELECTRIC SHOCK ! monitor that are important for safety. These parts are • If you want to replace with the new backlight (CCFL) or marked on the schematic diagram and the inverter circuit, must disconnect the AC adapter...

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in service manual and its supplements and addenda, read this service manual. and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication.
  • Page 5 General Soldering Guidelines Replacement 1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad and solder it.
  • Page 6 Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off"...

  • Page 7: Timing Chart

    TIMING CHART VIDEO SYNC Front Back Resol - Frequency Total Sync Display mode section polarity CLOCK Porch Porch ution [kHz]/[Hz] Period(E) [MHz] H(Pixels) 31.468 720X400 28.321 V(Lin es) 70.08 H(Pixels) 31.469 640x480 25.175 V(Lines) 59.94 H(Pixels) 37.5 640x480 31.5 V(Lines) H(Pixels) 37.879 1056...

  • Page 8: Disassembly

    DISASSEMBLY Change your lock on the product as it follows and turn Pull the cabinet upwards, Then separate all latches on each side. it in the arrow direction. Disassemble the back cover. Remove the control button from cabinet, Then disassemble the connector. Separate the lamp shield from rear shield.

  • Page 9: Block Diagram

    BLOCK DIAGRAM 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 1. Video Controller Part. This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the digital video signal using a pixel clock. The pixel clock for each mode is generated by the PLL. The range of the pixel clock is from 25MHz to 136MHz in W1943C case(28MHz to 146MHz In W1943C CASE).

  • Page 11: Description Of Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 67KHz ENERGY HVDC OUTPUT RECTIFIER INPUT RECTIFIER TRANSFER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- Collection- COUPLER CONTROL ISOLATION CIRCUIT PRIMARY SECONDARY Operation description_Power 1. EMI components. This part contains of EMI components to comply with global marketing EMI standards like FCC,VCCI CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.

  • Page 12: Adjustment

    ADJUSTMENT Windows EDID V1.0 User Manual 2. EDID Read & Write 1) Run WinEDID.exe Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Doesn’t need setup Windows 2000, XP => Need to Port Setup. This program is available for LCD Monitor only. 1.

  • Page 13: Service Osd

    SERVICE OSD 1) Turn off the power switch at the right side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch for 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) CLEAR ETI : To initialize using time.

  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK ADAPTER, AND FIND OUT A SHORT CHECK J300 VOLTAGE POINT AS OPENING PIN3 (12V)? EACH POWER LINE IS U901 PIN3(5V) CHECK U901(5V) LINE CHECK U901 PIN2 CHECK U901(3.3V) LINE (3.3V) CHECK U501 PIN127,128 CHECK CRYSTAL(X501)
  • Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – ADAPTER NO RASTER (OSD IS NOT DISPLAYED) CHECK ADAPTER, CHECK J300 AND FIND OUT A SHORT VOLTAGE PIN3 POINT AS OPENING (12V)? EACH POWER LINE CHECK U901 PIN3(5V)? CHECK U901(5V) LINE CHECK U201 BL_ON CHECK Q501 PINC(3.8V)? PORT 1.
  • Page 16 3. NO RASTER (OSD IS NOT DISPLAYED) - MAIN NO RASTER (OSD IS NOT DISPLAYED) CHECK U901 CHECK U901 PIN2(3.3V) PIN2(3.3V) 1. CHECK PIN 63,64 U201 SOLDERING CONDITION PIN 63,64 2. CHECK X501 14.318MHZ? 3. TROUBLE IN U201 CHECK U201 PIN14(H-SYNC) AND CHECK CONNECTION LINE PIN15(V-SYNC).
  • Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK R730 AND PC IS GOING R731, SYNC INTO DPM MODE APPEARED? CHECK U201 PIN14,15 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. - 17 - LGE Internal Use Only Only for training and service purposes...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM EAD57188304 ADAPTER MAIN BORAD 6631P00011K 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 AUG. 2009 P/NO : MFL61926822 Printed in China...

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