LG FLATRON L1719S Service Manual
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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-*FS.A***EP)
L1919S (L1919S-*FS.A***EP)
*To apply the MSTAR Chip.

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Summary of Contents for LG FLATRON L1719S

  • 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-*FS.A***EP) L1919S (L1919S-*FS.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 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 [TYPE A] 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 DISASSEMBLY-Stand [TYPE B] 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 11: Block Diagram

    BLOCK DIAGRAM - 10 -...
  • Page 12 BLOCK DIAGRAM-POWER - 11 -...

  • Page 13: 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 14: 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 15: 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 16: 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 17: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J703 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK CHECK 3.3V LINE U601 PIN2 VOLTAGE (OPEN CHECK) (3.3V) ? NO PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE...
  • Page 18 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J703 AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH POWER LINE CHECK MICOM INV J703 PIN9 ON/OFF PORT. 1. CONFIRM BRIGHTNESS OSD CONTRL STATE.
  • Page 19 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U601 PIN 16, 75 3.3V? U201 1. CHECK C509, C510 SOLDERING CONDITION PIN96, 97 OSCILLATE AS 2. CHECK X501 14.31MHZ? 3. TROUBLE IN U201 U201 PIN27 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 20 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R730, R731 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 21 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 22 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, Less than 3V Pin1, 15 Check the waveform of U301 Check U301 Pin12 SSTCMT, Pin2, 3 Less than 1V...

  • Page 23: Wiring Diagram

    WIRING DIAGRAM EAD37414501 17" EAD37413101 19" 6631T20023J 6631900011H 6631T20010E - 22 -...

  • Page 24: Exploded View

    EXPLODED VIEW - 23 -...
  • Page 25 EBR37001401 CONTROL T.T LM72A BAIKAL II 17-INCH GREEN RD 19 SERIAL EBR36269401 POWER T.T LM-57C BAIKAL II - - baikal 2 FREE L1952/L1752 LCD LG INNOTEK, LIEN CHANG Baikal 2 lips ,4 lamp LG EAY36304901 INNOTEK CO., LTD(Oversea) EBU36999401 BAIKAL II MSTAR ANALOG BRAND LM72B 49509S0034A PRESS H-GI 0.8MM REAR HGI SHIELD LX52/ LX19 SERIES...
  • Page 26 EBR37001702 CONTROL T.T LM72A BAIKAL II 19-INCH GREEN RD 19 SERIAL (Oversea) EBR36269401 POWER T.T LM-57C BAIKAL II - - baikal 2 FREE L1952/L1752 LCD LG INNOTEK, LIEN CHANG Baikal 2 lips ,4 lamp LG EAY36304901 INNOTEK CO., LTD(Oversea) EBU36999405...

  • Page 27: Specifications

    REPLACEMENT PARTS LIST CAUTION : BEFORE REPLACING ANY OF THESE COMPONENTS, READ CAREFULLY THESAFETY PRECAUTIONS IN THIS MANUAL. * NOTE SAFETY Mark ! ALTERNATIVE PARTS L1*19S-BFS.K***EPN DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION Main Board 主...
  • Page 28 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION U503 0IMMR00203A FM24C08 8KBIT 1KX8BIT PILKOR ELECTRONICS 2.7VTO5.5V 100NSEC SOIC R/TP 8P C703 0CK103CK51A 0603B103K500CT 10nF 10% 50V FAIRCHILD SEMICONDUCTOR Y5P -30TO+85C 1608 TP PILKOR CORP...
  • Page 29 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION R709 0RJ2001D677 MCR03EZPJ202 2KOHM 5% 1/10W 1608 R/TP ROHM 1608 R/TP ROHM R514 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W R710 0RJ4701D677 MCR03EZPJ472 4.7KOHM 5% 1608 R/TP ROHM 1/10W 1608 R/TP ROHM...
  • Page 30 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION 10X20MM 5MM STRAIGHT TP 0RD1201Q609 RDM94T1J1K20 1.2KOHM 5% 1/4W C205 0CZZ9ST018A 0CZZ9ST018A(LGE) 1000uF 3.2X1.8MM 26.0MM AXIAL TA52 16V 1.4A -40TO+105C GP 2000HR SW1 6600R000133 JTP1280A6 1C1P...
  • Page 31 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION CY102 0CZZ9ST024A DCF101K26Y5PG63L0E0 100pF C319 0CH2102K566 C2012X7R1H102KT 1nF 10% 50V 10% 250V Y5P -25TO+85C 6.5X5MM X7R -55TO+125C 2012 TP TDK 10MM TP C320 0CK473DK56A C2012X7R1H473KT 47nF 10% 50V...
  • Page 32 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION 9.0X3.0MM NONE AXIAL TA52 4NSEC 350MW SOT23 R/TP 3P 2 SMART ELECTRONICS D405 0DSGD00048A MM4148 1V 75V 150MA 500MA R110 0RX1003K607 RSD02T3J100K 100KOHM 5% 2W 4NSEC 500MW LL34 R/TP 2P 1 12.0X4.0MM - AXIAL TA62...
  • Page 33 DATE: 2007-4-2 DATE: 2007-4-2 *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.NO. PART NO. DESCRIPTION / SPECIFICATION 2012 R/TP - ROHM R309 0RH1002D422 MCR10EZHF103 10KOHM 1% 1/8W R410 0RH1802D422 MCR10EZHF183 18KOHM 1% 1/8W 2012 R/TP ROHM 2012 R/TP - ROHM R309 0RN1502F409 RN-96T1F15K0 15KOHM 1% 1/6W R412 0RH1802D422...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 30 -...
  • Page 35 2. POWER & WAFER - 31 -...
  • Page 36 3. INVERTER - 32 -...
  • Page 37 4. POWER - 33 -...
  • Page 38 Mar. 2007 P/NO : MFL37893408 Printed in China...

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