Internal Use Only Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM12A E2042T (E2042T-**A) MODEL: ( ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS SPECIFICATIONS ................................................... 2 ADJUSTMENT ...................................................... 14 PRECAUTIONS ....................................................... 4 TROUBLESHOOTING GUIDE .............................. 16 TIMING CHART ....................................................... 8 WIRING DIAGRAM ............................................... 19 DISASSEMBLY ....................................................... 9 EXPLODED VIEW............
PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING • There are some special components used in LCD monitor that are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturer’s specified parts to prevent electric shock, fire or other hazard.
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1.
General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500 F to 600 F. 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead. 3. Keep the soldering iron tip clean and well tinned. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-bristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners. 5.
Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board.
TIMING CHART Video B C Sync D E F A MODE 1 2 3 4 5 6 7 8 9 CLASSIF Polar ICATION ity H(Pixels) - V(Lines) + H(Pixels) - V(Lines) - H(Pixels) - V(Lines) - H(Pixels) + V(Lines) + H(Pixels) + V(Lines) + H(Pixels) - V(Lines) - H(Pixels) + V(Lines) + H(Pixels) + V(Lines) + H(Pixels) + V(Lines) + DOT Frequency Total CLOCK [kHz]/ Period [MHz] 28.321 25.175 31.5 40.0 49.5 65.0 78.75 108.0 108.0 [Hz] (E) Display (A) Front Porch (D) Sync.
DISASSEMBLY-Set #1 Place the monitor face Down on the cushion or soft cloth. #2 Remove the stand body and atand base from the product. #3 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. #4 Disassemble back cover. 2010 LG Electronics. Inc. All right reserved.
E2042T Block Diagram LED Panel 20’’Inch BLOCK DIAGRAM Copyright 2010 LG Electronics. Inc. All right reserved.
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 28MHz to 108M in E2042T case(28MHz to 108M In E2042T CASE). This part consists of the Scaler, ADC convertor, TMDS receiver and LVDS transmitter.
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. Port Setup a) Copy “UserPort.sys” file to “c:\WINNT\system32\drivers” folder b) Run Userport.
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. c) Auto Color : W/B balance and Automatically sets the gain and offset value. (press key for over 3 sec) d) AGING : Select Aging mode(on/off). b) Module : To select applied module. d) NVRAM INIT : EEPROM initialize.
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK 1 NO CHECK ADAPTER(19V) IC102 PIN3(5V) YES 2 NO IS IC103 PIN25(3.3V) 3 1 CHECK IC102 PIN3 (5V) PIN27(1.2V) YES 4 1 NO CHECK IC103 PIN 42,43 PULSE CHECK CRYSTAL(X100) YES CHECK IC103 Waveforms 1 IC102 PIN3 (5V) 2 IC103 PIN27 (1.2V) 3 IC103 PIN 25 (3.3V) 4 IC103 PIN42,43 1.2V 2010 LG Electronics. Inc. All right reserved.
2. NO RASTER (OSD IS NOT DISPLAYED) - MAIN NO RASTER (OSD IS NOT DISPLAYED) CHECK IC103 PIN25(3.3V) PIN27(1.2V) NO CHECK IC102 PIN3(5V) IC504(1.2V) YES 1 IC103 PIN42,43 NO 1. CHECK PIN 42,43 SOLDERING CONDITION 2. CHECK X100 3. TROUBLE IN IC103 YES CHECK IC103 PIN36(V-SYNC) NO CHECK CONNECTION LINE FROM D-SUB TO IC103 And PIN35(H-SYNC) YES TROUBLE IN CABLE OR LCD MODULE 2010 LG Electronics. Inc. All right reserved.
3. TROUBLE IN DPM TROUBLE IN DPM CHECK P300 PIN13 (HSYNC) PIN14(VSYNC) NO CHECK PC PC IS GOING INTO DPM MODE YES 1 2 CHECK IC103 PIN35,36 SYNC PULSE NO CHECK H/V SYNC LINE YES TROUBLE IN IC103 Waveforms 1 H-SYNC 2 V-SYNC 2010 LG Electronics. Inc. All right reserved.
WIRING DIAGRAM LGD:EAD61905269 EAD61426311 MAIN BOARD 6631900011S EAD38438703 Copyright 2010 LG Electronics. Inc. All right reserved.
2010 530 300 200 540 520 or 510 500 400 410 900
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P/NO : MFL67122143 FEBRUARY.
