LG Flatron L1900J Service Manual
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LG Flatron L1900J Service Manual

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See also: User Manual
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM62A
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
L1900J (L1900J-BFQ.A**TNP)
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron L1900J

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM62A MODEL: L1900J (L1900J-BFQ.A**TNP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............14 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............7 WIRING DIAGRAM ..........19 DISASSEMBLY ............8 EXPLODED VIEW...........20 BLOCK DIAGRAM...........10 REPLACEMENT PARTS LIST .......22 DISCRIPTION OF BLOCK DIAGRAM ....11 ADJUSTMENT ............13 SCHEMATIC DIAGRAM .........

  • 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 Total Video Sync Front Blanking Sync MODE H / V Frequency Duration Porch Time Resolution Period Active Polarity Clock ( D ) ( C ) ( B ) ( E ) Time ( A ) H(Pixels) 25.175 31.469 640 x 350...

  • Page 8: Disassembly

    DISASSEMBLY Disassembly Stand Top Cover with Jig 1. Disassembly Rubber and Remove the screws. (jig P/No : 3911900036A) 2. Disassembly Stand Cover. Remove the tape and screws. Remove the screw. Remove the screw. let the all latches are separated.(#6-1~#6-4) - 8 -...
  • Page 9 # 6-2 # 6-1 # 6-4 # 6-3 1. Put the front face down. 2. Let the all latches are separated. Disassemble back cover. - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM Analog DVI-D - 10 -...

  • Page 11: Description Of Block Diagram

    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 135MHz.
  • Page 12 Adapter Board Block Diagram 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER SWITCHING OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFORMER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- CONTROL COUPLER CIRCUIT ISOLATION PRIMARY SECONDARY INVERTER CIRCUIT High Voltage Operation description 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 13: 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 => Don’t need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. 1.

  • Page 14: Service Osd

    SERVICE OSD 1. Install the 'DLPortIO.exe' and connection the monitor and PC by JIG. 2. Start the 'EDID.exe'. 1. LPT port Seting Select the Computer LPT Port. 2. Jig to use Select Using the JIG. 3. ABUS Commander Enter the Adjust and Select the 'Send CMD'. (Reference the adjust table) SERVICE OSD FB Auto Color...

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK ADAPTER, AND CHECK P303 FIND OUT A SHORT POINT VOLTAGE AS OPENING PIN1 (12V)? EACH POWER LINE CHECK CHECK 3.3V LINE IC102 PIN 8 (OPEN CHECK) VOLTAGE(3.3V) ? NO PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE IS IC101...
  • Page 16 2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER LINE, P304 AND FIND OUT A SHORT PIN1, PIN2 POINT AS OPENING 12V? EACH POWER LINE CHECK MICOM INV P304 PIN7 ON/OFF PORT. 1.
  • Page 17 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) IC101 PIN 7, 8 CHECK IC102 3.3V? IC101 1. CHECK C109, C110 PIN127, 128 SOLDERING CONDITION OSCILLATE AS 2. CHECK X101 14.31MHZ? 3. TROUBLE IN IC101 IC101 PIN32 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 18 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R307, R308 INTO DPM OFF MODE CHECK IC101 PIN 32,33 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U101 Waveforms 3 R308 V-Sync R307 H-Sync - 18 -...

  • Page 19: Wiring Diagram

    WIRING DIAGRAM 6631900080A 6631T12006F 6631900017F 6631T12006E - 19 -...

  • Page 20: Exploded View

    EXPLODED VIEW - 20 -...

  • Page 21: Exploded View Parts List

    Cover Assembly, L1900 . 19" CABINET ASSY ACQ30055804 Cover Assembly, L1900 . 19" CABINET ASSY R/J TYPE C/SKD 6304FLP372A LCD,Panel-TFT, LM190E06-TLA2 19INCH 1280X1024 300CD COLOR 72% - LG PHILIPS LCD ACQ30055905 Cover Assembly, L1900 LM62A 19" BACK COVER ASSY_JAR_BK ACQ30055911 Cover Assembly, L1900 .

  • Page 22: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark AL ALTERNATIVE PARTS DATE: 2006. 08. 25. DATE: 2006. 08. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 23 DATE: 2006. 08. 25. DATE: 2006. 08. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D309 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS R203 0RJ4702D477 MCR03EZPF473 47KOHM 1% 1/10W D310 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NS...
  • Page 24 DATE: 2006. 08. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D601 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2 D602 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2 D603 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2 D604 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2 D605 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2 D606 EAV30299301 BL-HUB33A-AV-TRB SUPER RED 2...

  • Page 25: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 25 -...
  • Page 26 2. POWER - 26 -...
  • Page 27 3. CONNECTOR - 27 -...
  • Page 28 4. J-Type LED - 28 -...
  • Page 29 5. POWER - 29 -...
  • Page 30 6. LED Bright control - 30 -...
  • Page 31 Aug. 2006 P/NO : MFL30105548 Printed in Korea...

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