LG FLATRON L1752S Service Manual
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LG FLATRON L1752S Service Manual

LG FLATRON L1752S Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM57A
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
L1752S (L1752S-SFQ.A**XQP,A**DQP)
L1752S (L1752S-WFQ.A**DQP)
L1952S (L1952S-SFQ.A**XQP,A**RQP)
*To apply the MSTAR Chip.

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  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM57A MODEL: L1752S (L1752S-SFQ.A**XQP,A**DQP) L1752S (L1752S-WFQ.A**DQP) L1952S (L1952S-SFQ.A**XQP,A**RQP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............15 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......16 TIMING CHART ............7 WIRING DIAGRAM ..........22 DISASSEMBLY ............8 EXPLODED VIEW...........23 BLOCK DIAGRAM...........10 REPLACEMENT PARTS LIST .......25 DISCRIPTION OF BLOCK DIAGRAM ....11 ADJUSTMENT ............14 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 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"...

  • Page 7: Timing Chart

    TIMING CHART VIDEO SYNC Total Video Sync Front Blanking Sync MODE H / V Frequency Duration Porch Time Period Active Resolution Polarity Clock ( D ) ( C ) ( B ) ( E ) Time ( A ) H(Pixels) 25.175 31.469 640 x 350...

  • Page 8: Disassembly

    DISASSEMBLY-Set Disassembly Like a picture. Remove the screws. # 3-1 # 3-2 1. Pull the front cover upward. 2. Then, let the all latches are separated.(#3-1~3-2) 3. Put the front face down. Disassemble back cover. - 8 -...
  • Page 9 DISASSEMBLY-Stand 1. In assembly state, Twist Stand Body to 2. Pull Stand and Separate Stand from Right side. Monitor set. # 3-1 # 3-2 3. Push the four latches on the bottom to the outside and Separate Stand Body & Base. (Reference the #3-2) - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: Discription Of Block Diagram

    BLOCK DIAGRAM-POWER - 11 -...
  • Page 12 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 13 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 14: 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 15: 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 16: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J403 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 3.3V LINE U301 PIN2 VOLTAGE (OPEN CHECK) (3.3V) ? NO PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE...
  • Page 17 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J403 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE CHECK MICOM INV J403 PIN9 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE.
  • Page 18 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U301 PIN 16, 75 3.3V? U201 1. CHECK C210, C211 SOLDERING CONDITION PIN96, 97 OSCILLATE AS 2. CHECK X201 14.31MHZ? 3. TROUBLE IN U201 U201 PIN27 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 19 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R442, R443 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 - 19 -...
  • Page 20 5. POWER NO POWER (POWER INDICATOR OFF) CHECK Trouble in Fuse (F101) Fuse F101 OK? CHECK C101 Voltage Check BD101 (AC110V->160Vdc (AC220V->304Vdc CHECK Check U101 Pin7 : 9~10V U101 Pin6 Waveform Check D102 (Square wave Come out?) Check Q101 Drain Trouble in Q101 Waveform Check D201, D202...
  • Page 21 6. Raster NO Raster (Lamp Off) CHECK Check Scaler Output P201 Pin9 (Main Board) 3.3V? Check U301 Pin3 Check Q301, Q302 Check the waveform of U301 Check U301 Pin2 OVP, Pin11, 12, 19, 20 Less than 1.8V Check the waveform of U301 Check U301 Pin10 CMP, Pin11, 12, 19, 20 Less than 2.75V...

  • Page 22: Wiring Diagram

    WIRING DIAGRAM 6631900109A 6631T20023J 6631900011H 6631T20010E - 22 -...

  • Page 23: Exploded View

    EXPLODED VIEW - 23 -...
  • Page 24 LCD,Module-TFT, LM190E03-TLB5 DRIVER 19.0INCH 1280X1024 300CD COLOR - - - - or 6304FLP355A LCD Panel, LM190E03-TLBC LG PHILIPS TFT COLOR DOT FREE OF LM190E03-TLB7,P4,645CH,300NITS,TN,8MS,LPL NJ,PB FREE,EGI,NEC S D-IC,SXGA,LVDS or 6304FLP337A LCD,Module-TFT, LM190E03-TLBB DRIVER 19.0INCH 1280X1024 300CD COLOR - - - - or 6304FLP336A LCD,Module-TFT, LM190E03-TLBA DRIVER 19.0INCH 1280X1024 300CD COLOR - - - -...

  • Page 25: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION: BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THE SAFETY PRECAUTIONS IN THIS MANUAL. MAIN BOARD AND POWER BOARD PARTS ARE DIFFERENT. * NOTE SAFETY Mark AL ALTERNATIVE PARTS DATE: 2006. 03. 27. DATE: 2006. 03. 27. *S *AL LOC.
  • Page 26 DATE: 2006. 03. 27. DATE: 2006. 03. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION D406 0DSDI00038A BAV99-(F) 1.25V 100V 300MA 2-LGENT R118 0RH2403D622 MCR10EZHJ244 240KOHM 5% 1/8W-LGENT D407 0DSDI00038A BAV99-(F) 1.25V 100V 300MA 2-LGENT R201...
  • Page 27 DATE: 2006. 03. 27. DATE: 2006. 03. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R414 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10 C205 0CZZ9ST018A AL EL CAPACITOR 1000UF 16V 2 R415 0RJ1200D677 MCR03EZPJ121 120OHM 5% 1/10W...
  • Page 28 DATE: 2006. 03. 27. DATE: 2006. 03. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION TRANSISTORs & ICs R407 0RJ3600E472 360 OHM 1/8 W 1% 2012 R/TP Q101 0TF760000AD SSS7N60B FAIRCHILD ST TO220F R408 0RJ3600E472...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 29 -...
  • Page 30 2. POWER & WAFER - 30 -...
  • Page 31 3. INVERTER - 31 -...
  • Page 32 4. POWER - 32 -...
  • Page 33 Mar. 2006 P/NO : 38289S0041 Printed in Korea...

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Flatron l1952s

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