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Summary of Contents for LG L194WS-BFS.A Q F Series
- Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM57G MODEL: L194WS(L194WS-SFS.A**Q*F) L194WS(L194WS-BFS.A**Q*F) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Table Of Contents
CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............12 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........18 DISASSEMBLY ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM ..........9 SCHEMATIC DIAGRAM ........20 DESCRIPTION OF BLOCK DIAGRAM....11 SCHEMATIC DIAGRAM ......... 21 SPECIFICATIONS 1. -
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 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"...
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Page 7: Timing Chart
TIMING CHART VIDEO SYNC Total Video Sync 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 8: Disassembly
DISASSEMBLY 1. Pull the front cover upward. Remove the screws. 2. Then, let the all latches are separated. 1. Open the Cabinet latch with Jig. Disassemble back cover. Disassemble Cabinet. 3. Put the front face down. Disassemble Connector. - 8 -... -
Page 9: Block Diagram
BLOCK DIAGRAM - 9 -... - Page 10 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 in L194WT/WTM/WTQ case.
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Page 11: Description Of Block Diagram
LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC ENERGY OUTPUT RECTIFIER INPUT RECTIFIER COMPONENTS TRANSFER AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- Collection COUPLER CONTROL ISOLATION CIRCUIT Feedback PRIMARY SECONDARY Operation description_Power 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 => Doesn’t need setup Windows 2000, XP => Need to Port Setup. This program is available for LCD Monitor only. 1. - Page 13 SERVICE OSD 1) Turn off the power switch at the right side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch for 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) CLEAR ETI : To initialize using time.
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Page 14: Troubleshooting Guide
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, AND FIND OUT A SHORT CHECK P702 VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK IC601(1.8V) IS IC601 PIN2(1.8V) IC602(3.3V) LINE IC602 PIN2(3.3V) CHECK IC501 PIN108 CHECK CRYSTAL(X501) PULSE CHECK IC501... - Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK P702 CHECK POWER BOARD VOLTAGE PIN5,6 (LIPS) (5V)? CHECK IC501 INVERTER P702 PIN9 5V? ON/OFF PORT 1. CONFIRM BRIGHTNESS OSD CONTRL STATUS CHECK P702 2.
- Page 16 3. NO RASTER (OSD IS NOT DISPLAYED) - MAIN NO RASTER (OSD IS NOT DISPLAYED) CHECK IC501 CHECK IC601(1.8V), PIN2(3.3V) IC602(3.3V) PIN17(1.8V) 1. CHECK PIN 108,109 U501 SOLDERING CONDITION PIN 108,109 2. CHECK X501 14.3MHZ? 3. TROUBLE IN IC501 CHECK IC501 PIN89(H-SYNC) AND CHECK CONNECTION LINE PIN90(V-SYNC).
- Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK R720 AND PC IS GOING R726, SYNC INTO DPM MODE APPEARED? CHECK IC501 PIN89,90 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN IC501 Waveforms 1 H-SYNC 2 V-SYNC - 17 -...
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Page 18: Wiring Diagram
WIRING DIAGRAM 6631900109A 6631T20023J EAD30368601 - 18 -... -
Page 19: Exploded View
EXPLODED VIEW - 19 -... -
Page 20: Schematic Diagram
Main Total Assembly, L194CW-BFQ BRAND LM57G (F)GENESIS EAY36304902 Power Supply Assembly,Baikal2 for 19"Wide FREE L19xW LCD LG INNOTEK, LIEN CHANG Baikal 2 lips ,4 lamp, for 19"Wide LG INNOTEK CO., LTD EBR36269402 PCB Assembly,Power,POWER T.T LM-57C BAIKAL II - -... - Page 23 2N3906...
- Page 24 JUNE 2007 P/NO : MFL32179224 Printed in China...
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