LG Flatron L1753 Service Manual
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LG Flatron L1753 Service Manual

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CHASSIS NO. : LM57B
READ THE
L1753H(L1753H-*FS.A***QPN)
L1953H(L1953H-*FS.A***QPN)
L1753HR(L1753HR-*FS.A***QPN)
L1953HR(L1953HR-*FS.A***QPN)
IN THIS MANUAL.
*To apply the MSTAR Chip .

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Summary of Contents for LG Flatron L1753

  • Page 1 CHASSIS NO. : LM57B L1753H(L1753H-*FS.A***QPN) L1953H(L1953H-*FS.A***QPN) L1753HR(L1753HR-*FS.A***QPN) L1953HR(L1953HR-*FS.A***QPN) READ THE 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

    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 Hold the product as it follows and lift up the Stand Change your hold on the product as it follows and turn slightly. the Stand Base in the arrow direction until you hear a "click." Pull out the Stand to remove. Remove the screws.
  • Page 9 DISASSEMBLY-Stand Hold the body of the Stand as it follows. Press the two latches at the same time as it follows. Pushing Latch inside,Take the stand base from stand The body of the Stand and the Stand Base are body. successfully separated.

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 12 -...
  • Page 11 BLOCK DIAGRAM-POWER - 11 -...

  • Page 12: 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 13: 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 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 J905 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 3.3V LINE U901 PIN 2 VOLTAGE (OPEN CHECK) (3.3V) ? NO PROBLEM CHECK KEY CONTROL...
  • Page 17 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J905 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE CHECK MICOM INV J905 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) U501 PIN 58, 57 CHECK U901 3.3V? U501 1. CHECK C509, C510 PIN127, 128 SOLDERING CONDITION OSCILLATE AS 2. CHECK X501 14.31MHZ? 3. TROUBLE IN U501 U501 PIN32 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 19 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R718, R719 INTO DPM OFF MODE CHECK U501 PIN 32,33 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U101 Waveforms 3 R333 V-Sync R332 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 Pin2 Check Q301, Q302 Check the waveform of U301 Check U301 Pin6 VSEN, Pin1,15 Less than 1.8V Check the waveform of U301 Check U301 Pin12 SSTVMT Pin2, 3 CMP,Less than 2.75V If waveform is no problem...

  • Page 22: Wiring Diagram

    WIRING DIAGRAM 6631900109A 6631T20023J 6631900011H 6631T20010E-L1753HR 6631900125A-L1953HR - 22 -...

  • Page 23: Exploded View

    EXPLODED VIEW - 23 -...
  • Page 24 LOR 72% 4/3 800:1 P7, 5ms, 160/160, TLI T-con, Lusem/Toshiba(Source/Gate), lamp Heesung, Diffuser x2+P EAJ36379501 LCD,Module-TFT,LM170E03-TLL2 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 800:1 P6, 5ms, 160/160, TLI T-con, Lusem/Toshiba(Source/Gate), Diffuser x2+Prism x1, lamp wire 135mm LG PHILIPS LCD EAJ36378001 LCD,Module-TFT,LM170E03-TLL1 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 800:1 P5, 5ms, 160/160, TLI T-con, Lusem/Toshba(Source/Gate), Diffuser*2+Prism*1,lamp wire 135mm LG PHILIPS LCD...
  • Page 25 EXPLODED VIEW PARTS LIST L1953H * Note:Safety mark Ref. No. Part No. Description ABJ32229405 Cabinet Assembly,L1953 . 19" NEW PATTERN TEXTURE FOR 30919C0019E -SILVER W/W ABJ32229456 Cabinet Assembly,L1953 . 19" NEW PATTERN TEXTURE FOR ACQ30262708 -SILVER PC ABJ32229437 Cabinet Assembly,L1953 . 19" NEW PATTERN TEXTURE FOR 30919C0030N -SILVER CN ABJ32229406 Cabinet Assembly,L1953 .
  • Page 26 LCD,Module-TFT,HT170E01-300 ZBD DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 5/4 800:1 4MASK, 5ms, 160/160 BOE HYDIS TECHNOLOGY EAJ36379501 LCD,Module-TFT,LM170E03-TLL2 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 800:1 P6, 5ms, 160/160, TLI T-con, Lusem/Toshiba(Source/Gate), Diffuser x2+Prism x1, lamp wire 135mm LG PHILIPS LCD EAJ36378001 LCD,Module-TFT,LM170E03-TLL1 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 4/3 800:1 P5, 5ms, 160/160, TLI T-con, Lusem/Toshba(Source/Gate), Diffuser*2+Prism*1,lamp wire 135mm LG PHILIPS LCD...
  • Page 27 LCD,Modul e -TFT,LM190E08-TLL3 DRIVER 19.0INCH 1280X1024 300CD COLOR 72% 4/3 800:1 P4, 5ms, 160/160, TLI T-con, Magna/Toshi b a(Source/Gate), l a mp Heesung, Di f fuser x2+LC213 x1, l a mp wi r e 160mm, depth 15.5T LG PHILIPS LCD...

  • Page 28: 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: 2007. 01. 27. DATE: 2007. 01. 27. *S *AL LOC.
  • Page 29 DATE: 2007. 01. 27. DATE: 2007. 01. 27. *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 30 DATE: 2007. 01. 27. DATE: 2007. 01. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C104 0CH5271K416 270PF 2012 50V 5% NP0 R/TP D406 0DSDI00038A "BAV99-(F),LF DIODES R/TP SOT" C105 0CZZ9ST013A AL EL CAPACITOR 0.47UF 50V 2...
  • Page 31 DATE: 2007. 01. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R320 0RH1502D422 "15K , 1/10W 1% TP" R321 0RH1002D422 10K OHM 1/10 W 1% 2012 R/TP R401 0RJ1001G476 1K OHM 1/4 W 1% 3216 R/TP R402 0RJ1001G476 1K OHM 1/4 W 1% 3216 R/TP R403 0RJ1001G476...

  • Page 32: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 33 -...
  • Page 33 2. POWER & WAFER - 33 -...
  • Page 34 3. INVERTER - 33 -...
  • Page 35 4. POWER - 32 -...
  • Page 36 May. 2007 P/NO : MFL30290843 Printed in China...

This manual is also suitable for:

Flatron l1953Flatron l1753hrFlatron l1953hrFlatron l1753hmFlatron l1953hm

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