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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-82
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
L1750E (L1750E-SFN.AN**EP)
L1750E (L1750E-BFN.AN**EP)
L1950E (L1950E-SFN.AN**EP)
L1950E (L1950E-BFN.AN**EP)
*To apply the MSTAR Chip.
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Table of Contents
Related Manuals for LG Flatron L1750E
Summary of Contents for LG Flatron L1750E
- Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-82 MODEL: L1750E (L1750E-SFN.AN**EP) L1750E (L1750E-BFN.AN**EP) L1950E (L1950E-SFN.AN**EP) L1950E (L1950E-BFN.AN**EP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.
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Page 2: Table Of Contents
CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............13 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........18 DISASSEMBLY ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM ........... 9 REPLACEMENT PARTS LIST .......21 DESCRIPTION OF BLOCK DIAGRAM....10 SCHEMATIC DIAGRAM ......... -
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 << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Total Period Video Active Front Porch Sync Duration Back Porch Mode Frequency Resolution Sort Polarity Clock Time (A) 25.175 31.469 640 x 350... -
Page 8: Disassembly
DISASSEMBLY Disassembly Hinge Cover. Remove the screws. Disassemble back cover 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Remove the 6 screws from each up of metal frame. Pell off Al-tape from panel. -
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
LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC ENERGY INPUT RECTIFIER OUTPUT RECTIFIER TRANSFER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- COMTROL COUPLER 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 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
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 14: 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 15 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 J705 PIN9 CHECK MICOM INV 2.5V? ON/OFF PORT. 1.
- Page 16 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? U201 1. CHECK PIN122, 123 PIN96, 97 SOLDERING CONDITION OSCILLATE AS 2. CHECK X501 12MHZ? 3.
- Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R216, R217 INTO DPM OFF MODE R778, R781 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 - 17 -...
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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: or 6631T20034M 6631T11017X-L1750E 6631T11017Y-L1950E - 18 -... -
Page 19: Exploded View
EXPLODED VIEW - 19 -... -
Page 20: Exploded View Parts List
LCD(LIQUID CRYSTAL DISPLAY), LM170E01-TLAL LG PHILPS TFT COLOR P6,645CH,250NITS,8MS,JJ TECH,LPL NJ/KUMI,PB FREE,EGI,MAGNA,S D-IC, or 6304FLP301A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-TLAD LG PHILPS TFT COLOR DOT FREE OF LM170E01-TLA4 LG PHILPS TFT COLOR P6,645CH,250NITS,8MS or 6304FLP300A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-TLAC LG PHILPS TFT COLOR DOT FREE OF LM170E01-TLA3 LG PHILPS TFT COLOR P5,645CH,250NITS,8MS... -
Page 21: Replacement Parts List
SCHEMATIC DIAGRAM 1. TSU56AL / TSU16AL - 23 -... - Page 22 2. MICOM - 24 -...
- Page 23 3.POWER - 25 -...
- Page 24 4. CONNECTOR & JACKS - 26 -...