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LG Flatron L1932P Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM51A
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
L1932P (L1932P-DNN.AX**QS)

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  Summary of Contents for LG Flatron L1932P

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM51A MODEL: L1932P (L1932P-DNN.AX**QS) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............13 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........18 DISASSEMBLY ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM.............9 REPLACEMENT PARTS LIST .......21 DISCRIPTION OF BLOCK DIAGRAM ....10 ADJUSTMENT ............12 SCHEMATIC DIAGRAM .........
  • Page 3: Precautions

    PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING BE CAREFUL ELECTRIC SHOCK ! • There are some special components used in LCD 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 Period Active Duration Porch Time Resolution Clock Polarity ( E ) Time ( A ) ( D ) ( C ) ( B ) H(Pixels) 25.175 31.469 640 x 350...
  • Page 8: Disassembly

    DISASSEMBLY Remove the screws. Disassembly back door. Pull up the cabinet corner side. Disassemble back cover. - 8 -...
  • Page 9: Block Diagram

    BLOCK DIAGRAM - 9 -...
  • Page 10: 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 11: Lips Board Block Diagram

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

    SERVICE OSD 1) Turn off the power switch at the front side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch with 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) Auto Color : W/B balance and Automatically sets the gain and offset value.
  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J806 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 5VS LINE U502 PIN 8 VOLTAGE (OPEN CHECK) (5V) ? NO PROBLEM CHECK KEY CONTROL...
  • Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J806 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE J806 PIN9 CHECK MICOM INV ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE.
  • Page 16 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U801 (17", 19") PIN 106,1 CHECK U803 (15") 3.3V? 1. CHECK PIN122, 123 U201 SOLDERING CONDITION PIN55, 56 2. CHECK X501 OSCILLATE AS 3.
  • Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK CHECK PC R223, R823 PC IS NOT GOING R222, R825 INTO DPM OFF MODE CHECK U201 PIN 101, 103 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U501 Waveforms 3 R222, R825 V-Sync R223, R823 H-Sync - 17 -...
  • Page 18: Wiring Diagram

    WIRING DIAGRAM 6631T11012W or 6631T11020W 6631T20023A 6631T12006L - 18 -...
  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 20: Exploded View Parts List

    LCD,Module-TFT, LM190E03-TLB5 DRIVER 19.0INCH 1280X1024 300CD COLOR - - - - or 6304FLP355A LCD Panel, LM190E03-TLBC LG PHILIPS TFT COLOR DOT FREE OF LM190E03-TLB7,P4,645CH,300NITS,TN,8MS,LPL NJ,PB FREE,EGI,NEC S D-IC,SXGA,LVDS or 6304FLP337A LCD,Module-TFT, LM190E03-TLBB DRIVER 19.0INCH 1280X1024 300CD COLOR - - - - or 6304FLP336A LCD,Module-TFT, LM190E03-TLBA DRIVER 19.0INCH 1280X1024 300CD COLOR - - - -...
  • Page 21: 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. 04. 01. DATE: 2006. 04. 01. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 22 DATE: 2006. 04. 01. DATE: 2006. 04. 01. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION RESISTORs C902 0CK103CK51A 0603B103K500CT 10nF 10% 50V C903 0CC102CK41A C1608C0G1H102JT 1nF 5% 50V C Q502 0TRIH80001A RT1C3904-T112 NPN 6V 60V 40V...
  • Page 23 DATE: 2006. 04. 01. DATE: 2006. 04. 01. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R560 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10 R855 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W R561 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10 R856 0RJ4701D677...
  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 24 -...
  • Page 25 2. MICOM - 25 -...
  • Page 26 3.MEMORY - 26 -...
  • Page 27 4. JACK & WAFER - 27 -...
  • Page 28 5. POWER - 28 -...
  • Page 29 Apr. 2006 P/NO : 38289S0041 Printed in Korea...