Table of Contents
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Table of Contents
Related Manuals for LG L204WS
Summary of Contents for LG L204WS
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Page 1: Color Monitor
Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM72A MODEL: L204WS(L204WS-SFS.A***QF) L204WS(L204WS-BFS.A***QF) ) **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 ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........18 DISASSEMBLY ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM ..........9 REPLACEMENT PARTS LIST .......20 DESCRIPTION OF BLOCK DIAGRAM....10 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
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 H / V Frequency Period Active Duration Porch Time Resolution Polarity Clock ( E ) Time ( A ) ( D ) ( C ) ( B ) H(Pixels) 28.321 31.468 720 X 400 V(Lines) -
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
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 146MHz In L204WT/WTM/WTQ CASE). -
Page 11: Lips Board 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
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. -
Page 14: Troubleshooting Guide
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J603 VOLTAGE CHECK POWER BOARD LIPS PIN5, PIN6 (5V)? IS U902 PIN2(1.8V) CHECK U901/U902 U901 PIN2(3.3V) CHECK X501 PULSE CHECK CRYSTAL(X501) CHECK U501 Waveforms J603 #5,6 U902 #2 U901 #2 X501 #1,2 - 14 -... - Page 15 2. WHITE PANEL WHITE PANEL CHECK LVDS CONNECT LVDS JOIN ? CHECK U501#103 0.7V ? CHECK U501 CHECK C601 CHECK CIRCUIT Q601 Q602 ANODE 5V ? REPLACE LCD MODULE Waveforms P702-#5,6 P702-#10 LAMP CURRENT - 15 -...
- Page 16 3. LIGHTNESS LOWER (BLACK PANEL) LIGHTNESS LOWER (BLACK PANEL) CHECK LVDS CHECK U501 SIGNAL ? CHECK J603 #9 CHECK U501 HIGH-TENSION? CHECK POWER CHECK Invert EXPORT 12V/5V ? HIGH-TENSION? CHECK POWER BOARD SMPS Waveforms IC501-#108 - 16 -...
- Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK R705 AND PC IS GOING R706, SYNC INTO DPM MODE APPEARED? CHECK U501 PIN41,42 CHECK H/V SYNC LINE SYNC PULSE CHECK R709 REPLACE SINGAL LINE HIGH-TENSION? CHECK U501#108 CHECK LINE SF-DET HIGH-TENSION? CHECK U501 Waveforms...
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Page 18: Wiring Diagram
WIRING DIAGRAM 6631900109A(Gestesis) EAD35660901 EAD30368601 - 18 -... -
Page 19: Exploded View
EXPLODED VIEW - 19 -... -
Page 20: Replacement Parts List
LCD,Module-TFT , CLAA201WA04 ZBD WSXGA 20.1INCH 1680X1050 300CD COLOR 72% 16/10 1000:1 5ms,TN,170/160,4CCFL,6BIT+A-FRC,Non-Glare,ZBD CHUNGHWA PICTURE TUBES EAJ38028601 EAJ38176901 LCD,Module-TFT, LM201WE3-TLH2 WSXGA 20.1INCH 1680X1050 300CD COLOR 72% 16/10 1000:1 5ms,TN,160/160,4CCFL,16.7M(6BIT+Hi-FRC),Non-Glare,Source:Lusem, Gate:OKI LG PHILIPS LCD EAJ33945701 LCD,Module-TFT, M201EW02-V1 ZBD DRIVER 20.1INCH 1680X1050 300CD COLOR 72% 16/10 800:1 ZBD 160/160 5ms 4LAMPS AU OPTRONICS CORP 3809900217Q Cover Assembly,L204WT/WTQ ... -
Page 21: Schematic Diagram
SCHEMATIC DIAGRAM 1. SCALER - 21 -... - Page 22 2. POWER - 22 -...
- Page 23 3. WAFER - 23 -...
- Page 24 JUNE 2007 P/NO : MFL32179226 Printed in China...