LG FLATRON L1922P Service Manual
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LG FLATRON L1922P Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-64
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
L1922P
(L1922PFM.AF**EF)

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Summary of Contents for LG FLATRON L1922P

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-64 MODEL: L1922P (L1922PFM.AF**EF) ) **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 ............12 PRECAUTIONS ............4 TROUBLESHOOTING GUIDE ......14 SERVICE PRECAUTIONS ........5 WIRING DIAGRAM ..........18 TIMING CHART ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM ............9 REPLACEMENT PARTS LIST .......21 DESCRIPTION OF BLOCK DIAGRAM ....10 SCHEMATIC DIAGRAM .........
  • Page 3 Signal Connector Pin Assignment • DVI-D Connector Signal (DVI-D) Signal (DVI-D) T. M. D. S. Data2- Hot Plug Detect T. M. D. S. Data2+ T. M. D. S. Data0- T. M. D. S. Data2/4 Shield T. M. D. S. Data0+ T.

  • Page 4: 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 5: Service 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 6 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 7 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 8: Timing Chart

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

  • 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 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER ENERGY OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 ~ 240V SIGNAL PWM CONTROL PHOTO -COUPLER COLLECT- CIRCUIT ISOLATION PRIMARY SECONDARY High Voltage output INVERTER CIRCUIT Operation description_LIPS 1.

  • 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 1)Turn off the power switch at the front side of display. 2)Wait for about 5 seconds and press MENU,POWER key. 3)Shows the service OSD menu. 4)The service 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 POWER BOARD, CHECK J603 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 5VS LINE U202 PIN 32 (OPEN CHECK) VOLTAGE (5V) ? NO PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE...
  • Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) J603 CHECK LIPS PIN5, PIN6 CHECK MICOM INV J603 PIN9 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. J603 PIN10 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS CONTACTING SCOPE...
  • Page 16 3. NO RASTER (OSD IS NOT DISPLAYED) – GM5221 NO RASTER (OSD IS NOT DISPLAYED) U201 POWER PIN11, 50 CHECK U401 (3.3V)? U201 1. CHECK PIN169, 170 PIN169, 170 SOLDERING CONDITION OSCILLATE AS 2. CHECK X201 14.318MHZ? 3. TROUBLE IN U201 U201 PIN181 IS 64KHz H-SYNC? CHECK CONNECTION LINE...
  • Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R629, R630 (SYNC) ? INTO DPM OFF MODE CHECK TROUBLE IN SIGNAL U201 PIN 81 CABLE (0V) ? TROUBLE IN PC Waveforms 7 R630 V-SYNC R629 H-SYNC - 17 -...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM Connector Ass’y P/N: 6631T11012W or 6631T11020W Connector Ass’y P/N: 6631T20023A Connector Ass’y P/N: 6631T20024C Connector Ass’y P/N: 6631T20008G - 18 -...
  • Page 19 - 19 -...

  • Page 20: Exploded View

    EXPLODED VIEW PARTS LIST Part No. Description Ref. No. 3091TKL095S CABINET ASSEMBLY, L1922PF BRAND L083 F-ENG USA CIRCUIT CITY 6304FFT002D LCD(LIQUID CRYSTAL DISPLAY), FLC48SXC8V-11AA FUJITSU TFT COLOR CMO G5 300NT 700CR 25MS 3809TKL066F BACK COVER ASSEMBLY, L1920 L066 "D" CKD 3043TKK118D TILT SWIVEL ASSEMBLY, L1920P K691 WING "C"...

  • 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: 2005. 04. 26. DATE: 2005. 04. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 22 DATE: 2005. 04. 26. DATE: 2005. 04. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D605 0DS226009AA KDS226 TP KEC - 80V - - 4NSE R226 0RJ0472D677 47 OHM 1/10 W 5% 1608 R/TP D606 0DS226009AA KDS226 TP KEC - 80V - - 4NSE...
  • Page 23 DATE: 2005. 04. 26. DATE: 2005. 04. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R664 0RJ1801D677 1.8K OHM 1/10 W 5% 1608 R/TP D505 0DS226009AA KDS226 TP KEC - 80V - - 4NSE R665 0RJ3301D677 3.3K OHM 1/10 W 5% 1608 R/TP...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 24 -...
  • Page 25 2. POWER - 25 -...
  • Page 26 3. CONNECTOR - 26 -...
  • Page 27 Apr. 2005 P/NO : 3828TSL082Y Printed in Korea...

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