LG flatron L1752TQ Service Manual
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LG flatron L1752TQ Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM57B
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
E-mail:http://www.LGEservice.com/techsup.html
L1752TQ (L1752TQ-BFQ.A**DQP, A**WQP)
L1952TQ (L1952TQ-BFQ.A**XQP, A**WQP)
Website:http://biz.LGservice.com
*To apply the MSTAR Chip.

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Summary of Contents for LG flatron L1752TQ

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM57B MODEL: L1752TQ (L1752TQ-BFQ.A**DQP, A**WQP) L1952TQ (L1952TQ-BFQ.A**XQP, A**WQP) ) **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 ............17 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......18 TIMING CHART ............7 WIRING DIAGRAM ..........24 DISASSEMBLY ............8 EXPLODED VIEW...........25 BLOCK DIAGRAM...........12 REPLACEMENT PARTS LIST .......27 DISCRIPTION OF BLOCK DIAGRAM ....14 ADJUSTMENT ............16 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

    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 Soft pad on the table. Monitor on the pad. # 4-1 Hold the head & stand base and then Pull up the stand part. Twist Stand until "Click". # 4-2 Separate head & stand - 8 -...
  • Page 9 1. Pull the front cover upward. Remove the screws. 2. Then, let the all latches are separated.(#3-1~3-2) 3. Put the front face down. Disassemble back cover. - 9 -...
  • Page 10 DISASSEMBLY-Stand * In case of Latch 4. # 1-1 # 1-2 Push the four latches on the bottom to the outside and Separate Stand Body & Base. (Reference the #1-2) After finished repair, necessarily push 4ea Latches to inside for restoration. - 10 -...
  • Page 11 DISASSEMBLY-Stand * In case of Latch 2. Hold the stand body. Confirm two latch of right and left. Push the latch to the inside. Push the base to the opposite direction. Confirm the condition of separation. - 11 -...

  • Page 12: Block Diagram

    BLOCK DIAGRAM - 12 -...
  • Page 13 BLOCK DIAGRAM-POWER - 13 -...

  • Page 14: 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 15: Lips Board Block Diagram

    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 16: 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 17: 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 18: 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 19 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 20 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 21 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 - 21 -...
  • Page 22 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 23 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 24: Wiring Diagram

    WIRING DIAGRAM 6631900109A 6631T20023J 6631900011H 6631T20010E-L1752TX 6631900125A-L1952TX - 24 -...

  • Page 25: Exploded View

    EXPLODED VIEW - 25 -...

  • Page 26: Exploded View Parts List

    LCD,Module-TFT, LM170E01-TLB1 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% - - - or EAJ32168701 LCD,Module-TFT, LM170E01-TLBN DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 700 VS 1 8MS, LVDS, NEC D-IC, P6 FACTORY LG PHILIPS LCD . or EAJ32168501 LCD,Module-TFT, LM170E01-TLBM DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 700:1 8MS, LVDS, NEC D-IC LG PHILIPS LCD .

  • Page 27: 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: 2006. 10. 04. DATE: 2006. 10. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 28 DATE: 2006. 10. 04. DATE: 2006. 10. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION U503 0ISG240860B M24C08-WMN6TP 8KBIT 1KX8BIT R719 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W U701 0IMMR00014A M24C02-RMN6TP 2KBIT 256X8BIT R720 0RJ0332D677 MCR03EZPJ330 33OHM 5% 1/10W...
  • Page 29 DATE: 2006. 10. 04. DATE: 2006. 10. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION TRANSISTRO & ICs C205 0CZZ9ST018A AL EL CAPACITOR 1000UF 16V 2 C206 0CZZ9ST021A AL EL CAPACITOR 1000UF 25V 2 Q101 0TF760000AD SSS7N60B FAIRCHILD ST TO220F...
  • Page 30 DATE: 2006. 10. 04. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R407 0RJ3600E472 360 OHM 1/8 W 1% 2012 R/TP R408 0RJ3600E472 360 OHM 1/8 W 1% 2012 R/TP R409 0RJ3600E472 360 OHM 1/8 W 1% 2012 R/TP TH101 6322A00035A 10D2-07 SEMITEC 10OHM 15% L1...

  • Page 31: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 31 -...
  • Page 32 2. POWER & WAFER - 32 -...
  • Page 33 3. INVERTER - 33 -...
  • Page 34 4. POWER - 34 -...
  • Page 35 Oct. 2006 P/NO : 38289S0041 Printed in Korea...

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Flatron l1952tq

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