LG Flatron L1750SQ-SN Service Manual
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LG Flatron L1750SQ-SN Service Manual

Color monitor
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See also: User Manual
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.
龙泉现代YDW资料收藏
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
L1750SQ-SN
(L1750SQ-SNN.AN**QP)
L1750SQ-BN
(L1750SQ-BNN.AN**QP)
L1750SQ-WN
(L1750SQ-WNN.AN**QP)
*To apply the MSTAR Chip.

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Summary of Contents for LG Flatron L1750SQ-SN

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-82 MODEL: L1750SQ-SN (L1750SQ-SNN.AN**QP) L1750SQ-BN (L1750SQ-BNN.AN**QP) L1750SQ-WN (L1750SQ-WNN.AN**QP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip. 龙泉现代YDW资料收藏...
  • Page 2 Blank Page1 龙泉现代YDW资料收藏...

  • Page 3: 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 ADJUSTMENT ............

  • 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) >> Total Front Back Display Sync. MODE Section Polarity Frequency Resolution Period Porch Porch Clock ( A ) ( C ) ( E ) ( D ) ( B )

  • Page 9: 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. Pell off Al-tape from panel. Remove the 6 screws from each up of metal frame. Remove the 4 screws from each side of metal Remove Al-tape from control pcb fix.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 9 - 龙泉现代YDW资料收藏...

  • 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

    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? U201 1. CHECK PIN122, 123 PIN96, 97 SOLDERING CONDITION OSCILLATE AS 2. CHECK X501 12MHZ? 3.
  • Page 18 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 - 龙泉现代YDW资料收藏...

  • Page 19: Wiring Diagram

    WIRING DIAGRAM Connector Ass’y P/N: 6631T11012W or 6631T11020W Connector Ass’y P/N: 6631T20034M or 6631T20023A Connector Ass’y P/N: 6631T11017X - 18 - 龙泉现代YDW资料收藏...

  • Page 20: Exploded View

    EXPLODED VIEW - 19 - 龙泉现代YDW资料收藏...
  • Page 21 3091TKL168X CABINET ASSEMBLY, L1750SQ BRAND L122 WHITE ABS TCO03 8MS JP-VER 6304FLP200A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K4 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,TI S D-IC,SXGA,LVDS or 6304FLP199A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K3 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,SS S D-IC,EGI,250NITS,SXGA,LVDS...

  • 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. 03. 15. DATE: 2005. 03. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 23 DATE: 2005. 03. 15. DATE: 2005. 03. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R543 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP 6600TR1002A SKQGACE010 J-ALPS NON 12V 50 R544 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM 1. TSU56AL / TSU16AL - 23 - 龙泉现代YDW资料收藏...
  • Page 25 2. MICOM - 24 - 龙泉现代YDW资料收藏...
  • Page 26 3.POWER - 25 - 龙泉现代YDW资料收藏...
  • Page 27 4. CONNECTOR & JACKS - 26 - 龙泉现代YDW资料收藏...
  • Page 28 Mar. 2005 P/NO : 3828TSL094K Printed in Korea 龙泉现代YDW资料收藏...

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Flatron l1750sq-bnFlatron l1750sq-wn

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