LG L1752TX Service Manual
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LG L1752TX 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
L1752TX (L1752TX-SFQ.AX**QP, AW**QP)
L1752TX (L1752TX-BFQ.AX**QP, AW**QP)
L1952TX (L1952TX-SFQ.AX**QP, AW**QP)
L1952TX (L1952TX-BFQ.AX**QP, AW**QP)
Website:http://biz.LGservice.com
*To apply the MSTAR Chip.
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Summary of Contents for LG L1752TX

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM57B MODEL: L1752TX (L1752TX-SFQ.AX**QP, AW**QP) L1752TX (L1752TX-BFQ.AX**QP, AW**QP) L1952TX (L1952TX-SFQ.AX**QP, AW**QP) L1952TX (L1952TX-BFQ.AX**QP, AW**QP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    Color Depth : 8bits, 16.2M colors less than 33 W - L1752TX BLUE Size : 358.5 (H) x 296.5 (V) x 17.0(D) - L1752TX POWER ON (NORMAL) ACTIVE ON/ON : 396 (H) x 324 (V) x 17.5(D) - L1952TX L1952TX...

  • 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) # 3-3 After finished repair, necessarily push 4ea...

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...
  • Page 11 BLOCK DIAGRAM-POWER - 11 -...

  • Page 12: Discription 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 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-L1752TX 6631900125A-L1952TX - 22 -...

  • Page 23: Exploded View

    EXPLODED VIEW - 23 -...
  • Page 24 CABINET ASSEMBLY, L1952T BRAND 30909C0007 CABINET ASSY-SILVER -DUAL+PC ABS 30919C0019K CABINET ASSEMBLY, L1952T BRAND 30909C0007 CABINET ASSY-BLACK -DUAL+PC ABS 6304FLP278A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-TLB1 LG PHILPS TFT COLOR P5,645CH,300NITS,8MS,700/1,LPL NJ/KUMI,PB FREE,EGI,OKI S D-IC,EGI, 6304FAU012F LCD(LIQUID CRYSTAL DISPLAY), M170EG01-V9(V3) AUO TFT COLOR SXGA 400NITS 8MS GLARE PSWG 6304FLP310A...

  • Page 25: 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. 02. 08. DATE: 2006. 02. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 26 DATE: 2006. 02. 08. DATE: 2006. 02. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs Q304 0TR390609DC 2N3906S-RTK KEC REEL TAPING BD101 0DRTW00121A D2SB60-1121 TIWAN SEMI ST GB Q305 0TFDI80001A 2N7002 DIODES R/TP SOT23 60V...
  • Page 27 DATE: 2006. 02. 08. DATE: 2006. 02. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R235 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R448 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP R301 0RD1001Q609 1K OHM 1/4 W(3.4) 5.00% TA52...
  • Page 28 DATE: 2006. 02. 08. DATE: 2006. 02. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C403 0CZZ9ST028A CERAMIC DISK 10PF 6KV 5% TR R103 0RH1004D622 1M OHM 1 / 10 W 2012 5.00% D C404 0CH2153K516 15000PF 50V 10% B(Y5P) 2012...
  • Page 29 DATE: 2006. 02. 08. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LF101 6200J000154 13.0*710*23680 SAMWAH BULK L P201 6602T20008K SMW200-11 YEONHO 11P 2.0MM L P401 6630V90218A "35001WR YEONHO 2P 3.5MM DIP," P402 6630V90218A "35001WR YEONHO 2P 3.5MM DIP," P403 6630V90218A "35001WR YEONHO 2P 3.5MM DIP,"...

  • Page 30: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 30 -...
  • Page 31 2. POWER & WAFER - 31 -...
  • Page 32 3. INVERTER - 32 -...
  • Page 33 4. POWER - 33 -...
  • Page 34 Feb. 2006 P/NO : 38289S0041 Printed in Korea...

This manual is also suitable for:

Sfq.ax**qpAw**qpBfq.ax**qpL1952txL1952tx-bfq.ax**qp

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