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LG E2042T-BN manual

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Table of contents for the manual

  • Page 1

    COLOR MONIT OR SER VICE MANUAL W ebsite:http://biz.LGservice.com E-mail:http://www .LGEservice.com/techsup.html CAUTION BEFORE SERVICING THE UNIT , READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CHASSIS NO. : LM12A MODEL: ( ) **Same model for Service Internal Use Only E 20 42 T (E2042T-**A)[...]

  • Page 2

    - 2 - CONTENTS SPECIFICA TIONS ................................................... 2 PRECAUTIONS ....................................................... 4 TIMING CHART ....................................................... 8 DISASSEMBL Y ....................................................... 9 BLOCK DIAGRAM .......................................[...]

  • Page 3

    - 3 - WARNING FOR THE SAFETY-RELATED COMPONENT. • 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, fir[...]

  • Page 4

    - 4 - SER VICING 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 publi[...]

  • Page 5

    - 5 - 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. [...]

  • Page 6

    - 6 - 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 Connect[...]

  • Page 7

    TIMING CHART - 7 - Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. A B C D E F Video Sync MODE CLASSIF ICA TION Polar ity DOT CLOCK [MHz] Frequency [kHz]/ [Hz] T ot al Period (E) Display (A) Front Porch (D) Sync. (C) Back Porch (B) Resolut ion H(Pixels) - 31.468 900 720 18 108 54 [...]

  • Page 8

    # 1 # 4 # 2 # 3 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Disassemble back cover. DISASSEMBL Y -Set P lac e th e moni to r fa ce Do wn o n t h e cushio n or so ft clo th . Remov e th e stand body and atand base f rom t he produ ct. Copyright -  2010 LG Electronics. Inc. All right rese[...]

  • Page 9

    - 9 - BLOCK DIAGRAM Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. LED Panel 20’’Inch m a r g a i D k c o l B E2042T[...]

  • Page 10

    - 10 - DESCRIPTION OF BLOCK DIAGRAM Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. 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 pix[...]

  • Page 11

    - 11 - ADJUSTMENT Windows EDID V1.0 User Manual 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:WINNTsystem32drivers” folder b) Run Userport.exe c) Remove a[...]

  • Page 12

    - 12 - 220 IBM Compatible PC PARALLEL PORT Power inlet (required) Power LED ST Switch Power Select Switch (110V/220V) Control Line Not used RS232C PARALLEL V-SYNC POWER ST VGS MONITOR E E V-Sync On/Off Switch (Switch must be ON.) F F A A B B C C 15 10 5 5 6 9 1 1 1 14 13 25 6 5V 5V 5V 4.7K 4.7K 4.7K 74LS06 74LS06 OFF ON OFF ON 11 Video Signal Gener[...]

  • Page 13

    - 13 - TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK IC103 NO NO NO CHECK CRYSTAL(X 1 00) YES YES 1 2 1 3 1 4 Waveforms 1 2 3 4 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. 1.2V YES CHECK IC102 PIN3(5V) IS IC103 PIN25(3.3V) PIN27(1.2V) CHECK IC103 PIN 4[...]

  • Page 14

    - 14 - 2 . NO RASTER (OSD IS NOT DISPLA YED) - MAIN NO NO CHECK CONNECTION LINE FROM D-SUB TO IC103 TROUBLE IN CABLE OR LCD MODULE YES NO RASTER (OSD IS NOT DISPLAYED) YES 1 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. CHECK I C103 PIN25(3.3V) PIN27(1.2V) NO YES I C103 PIN42,43[...]

  • Page 15

    - 15 - 3 . TROUBLE IN DPM TROUBLE IN DPM TROUBLE IN IC103 CHECK PC PC IS GOING INTO DPM MODE NO CHECK H/V SYNC LINE NO YES YES 1 H-SYNC 2 V-SYNC Waveforms 1 2 Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. CHECK P300 PIN13 (HSYNC) PIN14(VSYNC) CHECK I C103 PIN35,36 SYNC PULSE[...]

  • Page 16

    WIRING DIAGRAM - 16 - Copyright Only for training and service purposes LGE Internal Use Only 2010 LG Electronics. Inc. All right reserved. EAD38438703 6631900011S EAD 61426311 LGD:EAD61905269 MAIN BOARD[...]

  • Page 17

    2010 300 500 510 520 530 400 900 200 540 410 or[...]

  • Page 18

    PD F c reated w i th pdf F a c tor y P ro tr i a l v er s i on www.pdffactory.com[...]

  • Page 19

    PD F c reated w i th pdf F a c tor y P ro tr i a l v er s i on www.pdffactory.com[...]

  • Page 20

    FEBRUARY.2012 P/NO : Printed in China MFL67122143[...]