LG FLATRON L1719S Service Manual
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LG FLATRON L1719S Service Manual

LG FLATRON L1719S Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-82
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
L1719S (L1719S-*FQ.A***EP)
L1919S (L1919S-*FQ.A***EP)
*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. : CL-82 MODEL: L1719S (L1719S-*FQ.A***EP) L1919S (L1919S-*FQ.A***EP) ) **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

    SERVICING PRECAUTIONS 9. Use with this receiver only the test fixtures specified in CAUTION: Before servicing receivers covered by this 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 ( E ) Time ( A ) ( D ) ( C ) ( B ) H(Pixels) 25.175 31.469 640 x 350...

  • Page 9: Disassembly

    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: Block Diagram-Power

    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 - 22 -...

  • Page 23: Exploded View

    EXPLODED VIEW - 23 -...
  • Page 24 EXPLODED VIEW PARTS LIST(L1719S) * Note: Safety mark Ref.No. Part No. Decription 30919C0021A Cover Assembly,L1719 BRAND 30909C0009 CABINET ASSY ANALOG SILVER 30919C0021B Cover Assembly,L1719 BRAND 30909C0009 CABINET ASSY ANALOG (BK) 30919C0021E Cover Assembly,L1719 . 17" L1719 BRAND 30909C0009 CABINET ASSY ANALOG (GLASS- SILVER) 30919C0021H Cover Assembly,L1719 .
  • Page 25 EXPLODED VIEW PARTS LIST(L1919S) * Note: Safety mark Ref.No. Part No. Decription 30919C0022A Cover Assembly,L1919 BRAND 30909C0010 CABINET ASSY ANALOG-BLACK (OTHERS) FOR CIS 30919C0022B Cover Assembly,L1919 BRAND 30909C0010 CABINET ASSY ANALOG-BLACK (HSD-ME12) FOR CIS 30919C0022C Cover Assembly,L1919 BRAND 30909C0010 CABINET ASSY ANALOG-SILVER (OTHERS) FOR CIS 30919C0022D Cover Assembly,L1919S .

  • Page 26: Replacement Parts List

    REPLACEMENT PARTS LIST CAUTION : BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THESAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark ! ALTERNATIVE PARTS DATE: 2006-4-18 DATE: 2006-4-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION MAIN BOARD C230...
  • Page 27 DATE: 2006-4-18 DATE: 2006-4-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION R224 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W ZD415 0DZ560009GB BZT52C5V6S-(F) 5.6V 5.2TO6V 1608 R/TP 40OHM 200MW SOD323 R/TP 2P 1 R225 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1/10W 1608 R/TP...
  • Page 28 DATE: 2006-4-18 DATE: 2006-4-18 2006-4-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs 25V 1.4A -40TO+105C GP 2000HR 10X20MM 5MM STRAIGHT TP U302 0TFVI80067A SI3865BDV(E3) N-CHANNEL C203 0CZZ9ST020A EGF687M1EG20TCSA 680uF 20% MOSFET 8V +-8V 2.9A 0.06OHM 25V 1.4A -40TO+105C GP 2000HR 830MW TSOP6 R/TP 6P...
  • Page 29 DATE: 2006-4-18 DATE: 2006-4-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION D404 0DSDI00038A BAV99-(F) 1.25V 100V 300MA 2A C403 0CZZ9ST028A ECO3J100J09BS1 10pF 5% 6KV S2L 4NSEC 350MW SOT23 R/TP 3P 2 -25TO+85C 9X5MM 10MM TP D404 0DSDI00038A...
  • Page 30 DATE: 2006-4-18 DATE: 2006-4-18 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION R318 0RJ1503E472 MCR10EZHF1503 150KOHM 1% R102 0RJ6801E472 RC98TRF6K80 6.8KOHM 1% 1/8W 1/8W 2012 R/TP 2012 R/TP R319 0RH1303D622 MCR10EZHJ134 130KOHM 5% 1/8W R103 0RH1004D622 MCR10EZHJ105 1MOHM 5% 1/8W...

  • Page 31: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 30 -...
  • Page 32 2. POWER & WAFER - 31 -...
  • Page 33 3. INVERTER - 32 -...
  • Page 34 4. POWER - 33 -...
  • Page 35 Jan. 2006 P/NO : 38289S0002M Printed in Korea...

This manual is also suitable for:

Flatron l1919sFlatron l1719s- fq.a ep seriesFlatron l1919s- fq.a ep seriesCl-82

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