LG FLATRON L3700A Service Manual
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LG FLATRON L3700A Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-70
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
L3700A
(L3700AC.AL**A)
L3700A
(L3700AKC.AL**A)
L3700A
(L3700AFC.AL**A)

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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-70 MODEL: L3700A (L3700AC.AL**A) L3700A (L3700AKC.AL**A) L3700A (L3700AFC.AL**A) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............13 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........21 BLOCK DIAGRAM ............9 EXPLODED VIEW...........22 DESCRIPTION OF BLOCK DIAGRAM....10 REPLACEMENT PARTS LIST .......24 ADJUSTMENT ............11 SCHEMATIC DIAGRAM ......... 34 SPECIFICATIONS 1.

  • Page 3: Precautions

    PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING BE CAREFUL ELECTRIC SHOCK ! • There are some special components used in LCD 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 << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> 1) PC Mode Total Video Front Sync Back Sync Period Active Porch Duration Porch MODE H / V Frequency Resolution Polarity Clock...
  • Page 8 2) Component Video Mode(Y/Pb/Pr) Total Video Front Back Sync Sync Period Active Porch Duration Porch MODE H / V Frequency Resolution Polarity Clock ( E ) Time ( A ) ( C ) ( D ) ( F ) H(Pixels) 25.175 31.469 SDTV...

  • Page 9: Block Diagram

    BLOCK DIAGRAM(uPD64011+gm1501H) - 9 -...

  • Page 10: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Input Selection Circuit 6. De-interlacer 1) PC Input Selection This block is composed of MDIN150(U901) and This block is composed of GM1501(U402) and peripheral devices. peripheral devices. GM1501 (U402) controls this IC through IIC Line. And this IC converts 16 Bit Interlaced Y/UV signal to 2) Video Input Selection De-interlaced signal.

  • Page 11: Adjustment

    ADJUSTMENT All adjustment are thoroughly checked and corrected 2. DDC Data Write Procedure-Digital when the monitor leaves the factory, but sometimes 1) Use this procedure only when there is some several minor adjustment may be required. problem on Digital EDID data. Adjustment should be following procedure and after 2) Run alignment program for L3200TC on the IBM warming up for a minimum of 30 minutes.
  • Page 12 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 13: Service Osd

    SERVICE OSD SEREVICE MENU ■ Service Menu - Model : Model or Micom Version Model : L3200T V1.0 - Elapsed time : Time used for panel Elapsed Time : - Nvram Initial : EEPROM reset and use Default Data NVram Inatial - WB Adjust : Adjusts the white balance WB Adjust - Aging Mode : Sets the aging mode (User : OFF)

  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J601 VOLTAGE CHECK POWER BOARD (18V, 12V, 5V)? CHECK J602 VOLTAGE CHECK POWER BOARD (24V, 33V) ? CHECK X401 CHECK X401 (14.318MHz) ? CHECK CHECK MICOM(U402) J601 SUB POWER PORT(R634) (SUB POWER) ? CHECK KEY CONTROL BOARD...
  • Page 15 Waveforms J602-24V J602-33V X401-14.318MHz J601 - 15 -...
  • Page 16 2. NO RASTER(OSD IS NOT DISPLAYED) NO RASTER (OSD IS NOT DISPLAYED) CHECK THE PERIPHERAL CHECK U402? IC U402 CHECK CHECK THE PERIPHERAL LVDS OUTPUT J802 (J802)? CHECK CHECK U607 AND THE INVERTER POWER PERIPHERAL IC U607 (J606, J607) ? CHECK INVERTER - 16 -...
  • Page 17 3. NO RASTER ON VIDEO SIGNAL INPUT NO RASTER ON VIDEO SIGNAL POWER CHECK OF CXA2040(U201) : U204(9V) POWER CHECK OF UPD64011(U904) : U905(3.3V), U906(1.5V) POWER CHECK OF MDIN150(U901) : U907(3.3V), U908(2.5V) POWER CHECK OF GM1501(U402) CHECK CABLE OF VIDEO/COMPONENT NO INPUT SIGNAL CHECK THE PERIPHERAL CHECK UPD64011(U904)I/O SIGNAL...
  • Page 18 4. SOUND TROBLE SHOOTING NO SOUND OUTPUT POWER CHECK OF MSP3420G(U501) : U522(8V), L501(5V), L505(5V) POWER CHECK OF TPA3004(U502) : C564(18V) CHECK SOUND OF VCR,DVD,PC CHECK OF CONNECTION OF TUNER AND ANTENNA CHECK SOUND INPUT =>PC SOUND(J707) =>VIDEO, DVD, DTV SOUND NO INPUT SIGNAL (RED, WHITE OF J701, J702) CHECK THE PERIPHERAL IC OF...
  • Page 19 5. NO RASTER STATE ON ANALOG SIGNAL NO RASTER ON ANALOG SIGNAL POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J802 CONNECTOR(J101) CHECK NO INPUT SIGNAL CHECK THE PERIPHERAL IC OF D-SUB(J101) CHECK ADC I/O SIGNAL IN GM1501(U402) NO OUTPUT SIGNAL CHECK THE PERIPHERAL IC OF GM1501(U402) NO INPUT SIGNAL...
  • Page 20 6. NO RASTER STATE ON DIGITAL SIGNAL NO RASTER STATEON DIGITAL SIGNAL POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J802 CONNECTOR(J102) CHECK NO INPUT SIGNAL CHECK GM1501(U402) I/O SIGNAL CHECK THE PERIPHERAL IC NO OUTPUT SIGNAL OF GM1501(U402) NO INPUT SIGNAL CHECK THE PERIPHERAL IC CHECK LVDS I/O SIGNAL...

  • Page 21: Wiring Diagram

    Connector Ass’y P/N: 6631T25024D Connector Ass’y P/N: 6631T25019G Connector Ass’y P/N: 6631T11012Q Connector Ass’y P/N: Connector Ass’y P/N: 6631T20032H 6631T20032H Connector Ass’y P/N: 6631T20029C Connector Ass’y P/N: 6631T20029G - 21 -...
  • Page 22 - 22 -...

  • Page 23: Exploded View

    REMOTE CONTROLLER RECEIVER, TSOP4838SO1 VISHAY 38.0KHZ LF,HOLDERLESS 6852TAZ006V CORD,A/V, RCA TO STEREO CABLE KCA-ET-0-0043 UL2863AWG25 TWI 1870MM WHITE WH/RED-WH 6852TAZ006D CORD,A/V, DIN CABLE UL 2990-9C(5.5) 1560MM BLACK(9930) DH-150DIN LM295B 6852TAZ006J CORD,A/V, A/V KHC-LG-3-0010 UL 2851 #28-2C 1500MM BLACK(9930) KSD WITH CORE LM295B - 23 -...

  • Page 24: 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: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 25 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C403 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y C5015 0CH8106F691 10UF 16V 20% 105STD (CYL) R/ C404 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y...
  • Page 26 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C567 0CK474CH94A "0.47UF 1608 25V 80%,-20% R/T" C667 0CH8226F691 22UF 16V 20% 105STD (CYL) R/ C568 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y...
  • Page 27 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C916 0CH8226F691 22UF 16V 20% 105STD (CYL) R/ C982 0CE337WF6DC 330UF MVK 16V 20% R/TP(SMD) C917 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP...
  • Page 28 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD602 0DZ330009DF MTZJ33B TP ROHM-K DO34 0.5W L512 6140TBZ007E "SLF12575T-330M3R2,TDK SMD CH" ZD701 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 L513 6140TBZ007E...
  • Page 29 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L603 6210TCE001G HH-1M3216-501 CERATEC 3216MM U601 0TFVI80023A VISHAY SI3865DV R/TP TSOP-6 L604 6210TCE001G HH-1M3216-501 CERATEC 3216MM U602 0TFVI80023A VISHAY SI3865DV R/TP TSOP-6...
  • Page 30 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R118 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP R273 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R119 0RJ0472D677 47 OHM 1/10 W 5% 1608 R/TP...
  • Page 31 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R437 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP R511 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP R438 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP...
  • Page 32 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R625 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R920 0RJ4700D677 470 OHM 1/10 W 5% 1608 R/TP R627 0RJ0222D677 22 OHM 1/10 W 5% 1608 R/TP...
  • Page 33 DATE: 2005. 05. 03. DATE: 2005. 05. 03. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION RA906 0RHZTCZ001D RCA SMART 22OHM 1/16 W 5% 32 R814 0RH5100D622 510 OHM 1 / 10 W 2012 5.00% RA907 0RHZTCZ001D RCA SMART 22OHM 1/16 W 5% 32...

  • Page 34: Schematic Diagram

    SCHEMATIC DIAGRAM 1. D-SUB/DVI-D INPUT - 34 -...
  • Page 35 2. VIDEO SWITCH (CXA2040) / TUNER (TV OPTION) - 35 -...
  • Page 36 3. MST9883 - 36 -...
  • Page 37 4. SCALER(GM1501H) - 37 -...
  • Page 38 5. AUDIO PROCESSOR / AMP / RS232 - 38 -...
  • Page 39 6. POWER/CONNECTOR - 39 -...
  • Page 40 6. POWER/CONNECTOR - 40 -...
  • Page 41 7. A/V IN/OUT JACK - 41 -...
  • Page 42 8. MDIN150/UPD64011A/MEMORY - 42 -...
  • Page 43 9. EX256/V-CHIP(M37272M6) - 43 -...
  • Page 44 May. 2005 P/NO : 38289S0001C Printed in Korea...

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