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LG Flatron L1750H Service Manual

Lg flatron color monitor service manual
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See also: User Manual
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-83
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
L1750H
(L1750H-SNN.AN**QP)
L1750H
(L1750H-GNN.AN**QP)
L1950H
(L1950H-SNN.AN**QP)
L1950H
(L1950H-GNN.AN**QP)
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron L1750H

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-83 MODEL: L1750H (L1750H-SNN.AN**QP) L1750H (L1750H-GNN.AN**QP) L1950H (L1950H-SNN.AN**QP) L1950H (L1950H-GNN.AN**QP) ) **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 ............4 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............8 WIRING DIAGRAM ..........19 DISASSEMBLY ............9 EXPLODED VIEW...........20 BLOCK DIAGRAM ..........10 REPLACEMENT PARTS LIST .......22 DESCRIPTION OF BLOCK DIAGRAM....11 ADJUSTMENT ............13 SCHEMATIC DIAGRAM .........

  • Page 3: Signal Connector Pin Assignment

    Signal Connector Pin Assignment • DVI-D Connector Signal (DVI-D) Signal (DVI-D) Hot Plug Detect T. M. D. S. Data2- T. M. D. S. Data2+ T. M. D. S. Data0- T. M. D. S. Data0+ T. M. D. S. Data2/4 Shield 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: 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 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 << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Duration Back Porch Sync Total Period Video Active Front Porch Mode Frequency Resolution Clock Sort Polarity Time (A) 31.469 25.175 640x350...

  • Page 9: Disassembly

    DISASSEMBLY Remove the screws. Disassembly Hinge Cover. Disassemble back cover 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Pell off Al-tape from panel. Remove the 6 screws from each up of metal frame. Remove Al-tape from control pcb fix.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 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 LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER ENERGY OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- COUPLER COMTROL CIRCUIT ISOLATI ON PRIMARY SECONDARY 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 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) 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 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J705 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 5VS LINE U501 PIN 8 VOLTAGE (OPEN CHECK) (5V) ? NO PROBLEM CHECK KEY CONTROL...
  • Page 16 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J705 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE CHECK MICOM INV J705 PIN9 ON/OFF PORT. 2.5V? 1.
  • Page 17 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U801 (17", 19") PIN 18, 90 CHECK U803 (15") 3.3V? 1. CHECK PIN122, 123 U201 SOLDERING CONDITION PIN96, 97 2. CHECK X501 OSCILLATE AS 3.
  • Page 18 4. TROUBLE IN DPM TROUBLE IN DPM CHECK CHECK PC R216, R217 PC IS NOT GOING R778, R781 INTO DPM OFF MODE CHECK U501 PIN 43.44 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U501 Waveforms 3 R217, R781 V-Sync R216, R778 H-Sync - 18 -...

  • Page 19: Wiring Diagram

    WIRING DIAGRAM Connector Ass’y P/N 6631T11012W or 6631T11020W Connector Ass’y P/N: 6631T20023A Connector Ass’y P/N: or 6631T20034M 6631T11017X-L1750H 6631T11017Y-L1950H - 19 -...

  • Page 20: Exploded View

    EXPLODED VIEW - 20 -...

  • Page 21: Exploded View Parts List

    LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5N5 LG PHILPS TFT COLOR PART NUMBER CHANGE FOR COST COMPENSATION or 6304FLP180B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K1 LG PHILPS TFT COLOR LPL NJ,PB FREE,EGI,TI S D-IC,SXGA,LVDS COST COMPENSATION or 6304FLP179B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6 LG PHILPS TFT COLOR LPL NJ,PB FREE,NEC S D-IC,EGI,250NITS,SXGA,LVDS COST COMPENSATION...

  • 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: 2005. 01. 26. DATE: 2005. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 23 DATE: 2005. 01. 26. DATE: 2005. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION U802 0TFVI80023A VISHAY SI3865DV R/TP TSOP-6-L1950H R752 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R753 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM 1. TSU56AL / TSU16AL - 24 -...
  • Page 25 2. MICOM - 25 -...
  • Page 26 3.POWER - 26 -...
  • Page 27 4. CONNECTOR & JACKS - 27 -...
  • Page 28 Jan. 2005 P/NO : 3828TSL096N Printed in Korea...

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Flatron l1950h

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