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LG L1752T-SFQ.AX**QP Service Manual
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LG L1752T-SFQ.AX**QP 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.
Website:http://biz.LGservice.com
E-mail:http://www.LGEservice.com/techsup.html
L1752T (L1752T-SFQ.AX**QP)
L1752T (L1752T-BFQ.AX**QP)
L1952T (L1952T-SFQ.AX**QP)
L1952T (L1952T-BFQ.AX**QP)
*To apply the MSTAR Chip.

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Summary of Contents for LG L1752T-SFQ.AX**QP

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM57B MODEL: L1752T (L1752T-SFQ.AX**QP) L1752T (L1752T-BFQ.AX**QP) L1952T (L1952T-SFQ.AX**QP) L1952T (L1952T-BFQ.AX**QP) ) **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, And Find Out a Short Point Check J403 Voltage 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 - 24 -...

  • Page 25: Exploded View

    EXPLODED VIEW - 25 -...

  • Page 26: Exploded View Parts List

    LCD(LIQUID CRYSTAL DISPLAY), LM190E03-TLB7 LG PHILPS TFT COLOR P4,645CH,300NITS,TN,8MS,LPL KUMI,PB FREE,EGI,NEC S D-IC,SXGA,LVDS or 6304FLP337A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-TLBB LG PHILPS TFT COLOR DOT FREE OF LM190E03-TLB7,P4,645CH,300NITS,TN,8MS,LPL KUMI,PB FREE 6304FLP310A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-TLB5 LG PHILPS TFT COLOR P4,645CH,300NITS,TN,8MS,LPL KUMI,PB FREE,EGI,OKI S D-IC,SXGA,LVDS...

  • Page 27: 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. 01. 26. DATE: 2006. 01. 26. *S *AL LOC.
  • Page 28 DATE: 2006. 01. 26. DATE: 2006. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs Q301 0TR144009AI DTA144EK CHIP TP ROHM - - BD101 0DRTW00121A D2SB60-1121 TIWAN SEMI ST GB Q302 0TR144009AH DTC144EK CHIP TP ROHM - -...
  • Page 29 DATE: 2006. 01. 26. DATE: 2006. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R227 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP R444 0RJ0332D677 33 OHM 1/10 W 5% 1608 R/TP R228 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP...
  • Page 30 DATE: 2006. 01. 26. DATE: 2006. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION RESISTORs C315 0CH3103K516 10000PF 50V 10% B(Y5P) 2012 C317 0CH5221K416 220PF 50V 5% NP0 2012 R/TP R101 0RJ4703G676 470K OHM 1/4 W 5% 3216 R/TP...
  • Page 31 DATE: 2006. 01. 26. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 4920900022A PLATE 7*60 16 LX52 4920900032A PLATE 20.5 *10.5 *12.0 L202 61409B0009A HL-1520S JEONGSAN 7.0UH 25% 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,"...

  • Page 32: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 32 -...
  • Page 33 2. POWER & WAFER - 33 -...
  • Page 34 3. INVERTER - 34 -...
  • Page 35 4. POWER - 35 -...
  • Page 36 Jan. 2006 P/NO : 38289S0041W Printed in Korea...

This manual is also suitable for:

L1952t-sfq.ax**qpL1752t-bfq.ax**qpL1952t-bfq.ax**qp

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