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LG Flatron L177WSB Service Manual
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LG Flatron L177WSB Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : LM76D
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
L177WSB (L177WSB-*FS.K***AP*)
Website:http://biz.LGservice.com

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Summary of Contents for LG Flatron L177WSB

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM76D MODEL: L177WSB (L177WSB-*FS.K***AP*) ) **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 ............14 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............7 WIRING DIAGRAM ..........21 DISASSEMBLY ............8 EXPLODED VIEW...........22 BLOCK DIAGRAM...........10 REPLACEMENT PARTS LIST .......24 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 9. Use with this receiver only the test fixtures specified in CAUTION: Before servicing receivers covered by this 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 Front Syn c Back Resol - Freque n cy Total Display mode section polarity CL O CK Porch Porch ution [kHz] /[Hz] Period (E ) [MHz] (C ) H(P ixels) 31.469 25.175 V( Lines) 70.09 H(P ixels ) 31.468 28.321 V( Lines)

  • Page 8: Disassembly

    DISASSEMBLY Put a cushion or soft cloth on a flat Place the monitor face down on surface. the cushion or soft cloth. Slide the Cable Deco Cover out from the stand body. Nip Latch inside, Take off the stand base from stand body. Please pull the stand body lightly Remove the screws.
  • Page 9 BLOCK DIAGRAM - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM-POWER - 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 136MHz.

  • Page 12: Lips Board Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC SWITCHING INPUT RECTIFIER OUTPUT RECTIFIER TRANSFORMER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PWM CONTROL COLLENT- PHOTO-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 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 - MAIN NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J703 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 3.3V LINE U601 PIN2 VOLTAGE (OPEN CHECK) (3.3V) ? NO PROBLEM CHECK KEY CONTROL...
  • Page 16 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J703 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE CHECK MICOM INV J703 PIN9 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE.
  • Page 17 3. NO RASTER (OSD IS NOT DISPLAYED) – MAIN NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U601 PIN 16, 75 3.3V? U201 1. CHECK C509, C510 SOLDERING CONDITION PIN96, 97 OSCILLATE AS 2. CHECK X501 14.31MHZ? 3. TROUBLE IN U201 U201 PIN27 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 18 4. TROUBLE IN DPM - MAIN TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R730, R731 INTO DPM OFF MODE CHECK U201 PIN 27,28 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U201 Waveforms 3 R443 V-Sync R442 H-Sync - 18 -...
  • Page 19 5. POWER - LIPS NO POWER (POWER INDICATOR OFF) CHECK Troub e n Fuse (F101) Fuse F101 OK? CHECK C101 Voltage Check BD101 (AC110V->160Vdc (AC220V->304Vdc Check IC101 Troub e n IC101 PIN5 Voltage Check D201, D202 Troub e n D201, D202 Voltage CHECK 5V, 12V L ne - 19 -...
  • Page 20 6. Raster - LIPS NO Raster (Lamp Off) CHECK Check Scaler Output P201 Pin9 (Main Board) 3.3V? Check IC301 Pin2 Check Q301, Q302 Check the waveform of U301 Check U301 Pin6 VSEN, Less than 3V Pin1, 15 Check the waveform of U301 Check U301 Pin12 SSTCMT, Pin2, 3 Less than 1V...

  • Page 21: Wiring Diagram

    WIRING DIAGRAM EAD37413101 6631T20023J 6631900030F 6631V12031H - 21 -...

  • Page 22: Exploded View

    EXPLODED VIEW - 22 -...

  • Page 23: Exploded View Parts List

    Ref. No. LCD,Module-TFT,LM171WX3-TLA1 WXGA 17.1INCH 1280X720 250CD COLOR 60% 16/10 EAJ38936201 800:1 LPL 17"W response time :8ms,P4,Color Depth:16.7M. Viewing Angle:160/160 LG PHILIPS LCD LCD,Module-TFT,HSD170MGW1-B00 WXGA 17.0INCH 1440X900 250CD COLOR 63% 16/10 600:1 Hannstar EAJ39167201 17"W ZBD, 2CCFL(Edge type),16.2M, Viewing Angle 80/80/80/80. Non-Glare. HANNSTAR DISPLAY CORPORATION LCD,Module-TFT,HSD170MGW1- B00 WXGA 17.0INCH 1440X900 250CD COLOR 63% 16/10 600:1 Hannstar...

  • Page 24: Replacement Parts List

    REPLACEMENT PARTS LIST DATE:2007.07.20 LOC NO. PART NO. DESCRIPTION/SPECIFICATION LOC NO. PART NO. DESCRIPTION/SPECIFICATON CAPACITORs TRANSISTORs C502 0CK473CK56A “Capacitor,Ceramic,Chip,C1608X7R1H473KT 47nF” Q501 0TRKE80046A “TR,Bipolar,2N3904S NPN 6V 60V 4” C503 0CK473CK56A “Capacitor,Ceramic,Chip,C1608X7R1H473KT 47nF” Q601 0TRKE80046A “TR,Bipolar,2N3904S NPN 6V 60V 4” C504 0CK473CK56A “Capacitor,Ceramic,Chip,C1608X7R1H473KT 47nF”...
  • Page 25 LOC NO. PART NO. DESCRIPTION/SPECIFICATON LOC NO. PART NO. DESCRIPTION/SPECIFICATON R736 0RJ0752D677 “Resistor,Chip,MCR03EZPJ750 75OHM 5” CONNECTORs 6602T12005E “Connector,Wafer,12505WR 06A00 6P 1.2” 6602T12005C “Connector,Wafer,12505WR 04A00 4P 1.2” J404 6630V90220E “Connector,Wafer,TJC2004 6A 6P 2.0MM” J701 6630G100316 “Connector,DSUB,DZ11AA1 HVG PF D SUB” J703 6630V90220K “Connector,Wafer,TJC2004 11A 11P 2.0M”...

  • Page 26: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 26 -...
  • Page 27 2. POWER & WAFER - 27 -...
  • Page 28 3. INVERTER - 28 -...
  • Page 29 4. POWER - 29 -...
  • Page 30 JULY. 2007 P/NO : MFL30290846 Printed in China...

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