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LG FLATRON L172WT Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : CL-56
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
L172WT
(L172WAL-AL**T)

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  Summary of Contents for LG FLATRON L172WT

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-56 MODEL: L172WT (L172WAL-AL**T) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............13 PRECAUTIONS ............4 TROUBLESHOOTING GUIDE ......16 TIMING CHART ............5 WIRING DIAGRAM ..........23 OPERATING INSTRUCTIONS ........ 6 EXPLODED VIEW...........24 DISASSEMBLY ............. 10 REPLACEMENT PARTS LIST .......26 BLOCK DIAGRAM ..........11 PIN CONFIGURATION..........33 DESCRIPTION OF BLOCK DIAGRAM....12 SCHEMATIC DIAGRAM .........
  • Page 3: Signal Connector Pin Assignment

    Signal Connector Pin Assignment • DVI-D Connector (Digital) Signal (DVI-D) Signal (DVI-D) T. M. D. S. Data2- Hot Plug Detect T. M. D. S. Data2+ T. M. D. S. Data0- T. M. D. S. Data0+ T. M. D. S. Data2/4 Shield T.
  • Page 4: 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 5: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Total Period Video Active Time Front Porch Sync Duration Back Porch Sync Mode Resolution Frequency Clock Sort Polarity 31.469 640x350 25.175 70Hz...
  • Page 6: Operating Instructions

    OPERATING INSTRUCTIONS FRONT VIEW REAR VIEW AV(CVBS) Input Terminal(Audio) AV(CVBS) Input Terminal(Video) S-Video S-Video Input Terminal Headphone/Earphone Connection Terminal MIC.In Microphone Connection Front Control Panel(P6) Terminal REAR VIEW CONNECTOR PANEL Back Audio Audio In MIC.Out DVI-I S-Video MIC.In 1. DVI Digital Signal Connector (DVI-D or DVI-A) 2.
  • Page 7: Front Control Panel

    OPERATING INSTRUCTIONS Front Control Panel • This Indicator lights up green when the display operates normally. If the display is in DPM Power LED (Energy Saving) mode, this indicator color changes to amber. Power Button • Press the button to turn on the power. Press the button again to turn it off. MENU Button •...
  • Page 8: Remote Controller Buttons

    TV: Automatic TV channel setup Button PC: Automatic adjustment function Operational at the TV mode only (Operational for the analog signal only) Sound Mode Select Select the sound mode : MONO/STEREO/SAP CAPTION Button Video Operation Button Applicable for LG products only - 8 -...
  • Page 9 • Input Select Button • TV/AV Button If you press the button once, This button will be enabled only the following Input Signal when you selected the TV/AV Window will appear. Select signal. The signal type will be the signal type you want changed with the following order.
  • Page 10: Disassembly

    DISASSEMBLY 1.BACK CAP REMOVAL 1)Remove the Back cap. 2. TV TUNER REMOVAL 1)Remove the screw(a). 2)Remove the Tuner. CAUTION To prevent scratches on the back cover, make sure to detach the tuner before detaching the back cover. - 10 -...
  • Page 11: Block Diagram

    BLOCK DIAGRAM - 11 -...
  • Page 12: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Input Signal Part 6. Audio decoder part. It is composed of four parts. This block is composed of MSP3420G (U503) and -PC signal input part:24pin DVI-I and PC Audio input peripheral devices. jack. This IC analyzes Audio input signal through A/V Jack -AV Video input part: RCA Jack (CVBS signal), S-Video and PC audio.
  • Page 13: Adjustment

    ADJUSTMENT Windows EDID V1.0 User Manual 2. EDID Read & Write Operating System: MS Windows 98, 2000, XP 1) Run WinEDID.exe Port Setup: Windows 98 => Don’t need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. [Analog EDID] At first select "DVI-Analog"...
  • Page 14: Service Osd

    SERVICE OSD SETUP SETUP MODEL L172WA L MODEL L172WA L NVRAM INITIAL NVRAM INITIAL ELAPSED TIME 21 H ELAPSED TIME 21 H MICOM VERSION Ver. 49 MICOM VERSION Ver. 49 VCHIP TEST VCHIP TEST UP / DOWN SELECT UP / DOWN SELECT 1.
  • Page 15 SETUP SETUP MODEL L172WAL MODEL L172WAL NVRAM INITIA NVRAM INITIA ELAPSED TIME 21 H ELAPSED TIME 21 H MICOM VERSION Ver. 49 MICOM VERSION Ver. 49 VCHIP TEST VCHIP TEST UP / DOWN SELECT UP / DOWN SELECT 7. Use this menu to adjust white balance. 8.
  • Page 16: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J601 CHECK LIPS POWER VOLTAGE BOARD (33V, 12V, 5V)? CHECK X401 CHECK X401 (14.318MHz) ? CHECK DATA LINE of CHECK MICOM(U402) U403 ? CHECK KEY CONTROL BOARD - 16 -...
  • Page 17 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 IC U402 (J401)? CHECK BOTTOM OF LIPS CHECK (Q201~Q204) LIPS POWER CHECK INVERTER CABLE - 17 -...
  • Page 18 3. NO RASTER ON VIDEO SIGNAL INPUT NO RASTER ON VIDEO SIGNAL CHECK CABLE OF VIDEO/COMPONENT CHECK THE PERIPHERAL IC CHECK VPC3230(U203) I/O SIGNAL OF VPC3230(U203) CHECK THE PERIPHERAL IC CHECK GM1501(U402) OF GM1501(U402) - 18 -...
  • Page 19 4. NO RASTER ON TV SIGNAL INPUT NO RASTER ON TV SIGNAL POWER CHECK OF TUNER(TU701) : L701(33V), L702(5V) POWER CHECK OF VPC3230(U203) :L205(5V), L213(3.3V) POWER CHECK OF GM1501(U402) CHECK CONNECTION OF TV TUNER AND ANTENNA CHECK TV CH SELECT AUTO CH OF OSD CHECK THE PERIPHERAL IC CHECK VPC3230(U203) I/O OF VPC3230(U203)
  • Page 20 5. SOUND TROBLE SHOOTING NO SOUND OUTPUT POWER CHECK OF MSP3420G(U503) : L514(8V), L509(5V) POWER CHECK OF TPA3004(U505) : C550(12V) CHECK SOUND OF VCR, HDTV,PC (TV)CHECK CONNECTION OF TUNER AND ANTENNA CHECK SOUND INPUT =>PC SOUND(J505) =>VIDEO, HDTV SOUND CHECK THE PERIPHERAL IC OF CHECK MSP3420G(U503) I/O SIGNAL MSP3420G(U503) INPUT: CHECK THE PERIPHERAL IC...
  • Page 21 6. NO RASTER STATE ON ANALOG SIGNAL NO RASTER ON ANALOG SIGNAL POWER CHECK OF BA7657(U103) : L102(5V) POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J401 CONNECTOR(J102) CHECK CHECK I/O SYNC OF BA7657(U103) CHECK ADC INPUT SIGNAL IN CHECK THE PERIPHERAL IC GN1501(U402) OF DVI-A(J102)
  • Page 22 7. NO RASTER STATE ON DIGITAL SIGNAL NO RASTER STATE ON DIGITAL SIGNAL POWER CHECK OF GM1501(U402) POWER CHECK OF LVDS OUTPUT: J401 CONNECTOR(J102) CHECK CHECK THE PERIPHERAL IC CHECK GM1501(U402) I/O SIGNAL OF GM1501(U402) CHECK THE PERIPHERAL IC CHECK LVDS I/O SIGNAL OF GM1501(U402) - 22 -...
  • Page 23: Wiring Diagram

    WIRING DIAGRAM J501 Connector Ass’y P/N: J503 J601 6631T11016C J201 J401 Connector Ass’y P/N: Connector Ass’y P/N: 6631T20029A 6631T20029F J402 Connector Ass’y P/N: 6631T20010B Connector Ass’y P/N: 6631T20010C Connector Ass’y P/N: 6631T20029E - 23 -...
  • Page 24 - 24 -...
  • Page 25: Exploded View Parts List

    EXPLODED VIEW PARTS LIST Description Ref. No. Part No. CABINET ASSEMBLY, L172WAL BRAND L084 US PC+ABS 3091TKL093B LCD(LIQUID CRYSTAL DISPLAY), LC171W03-A4K3 LG PHILPS TFT COLOR 17.1" WIDE 6304FLP061B BACK COVER ASSEMBLY, L172WAL L067 US PC+ABS 3809TKL064B TILT SWIVEL ASSEMBLY, L172WA K428 BRAND 3043TKK143A...
  • Page 26: 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: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 27 DATE: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C262 0CK105CF94A 1UF 1608 16V 80%,-20% R/TP F( C477 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP C266 0CK472CK51A 4700PF 1608 50V 10% R/TP B(Y5...
  • Page 28 DATE: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C561 0CC3R3CK01A 3.3PF 1608 50V 0.25 PF R/TP N C653 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C562 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R...
  • Page 29 DATE: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD508 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 2 L201 0LC2000005D F1-B2012-332KJT,3.3 UH CERATE ZD509 0DZ560009DA UDZ S 5.6B TP ROHM-K SOD323 2...
  • Page 30 DATE: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q401 0TR162309CA KSC1623 TP SAMSUNG SOT23 NPN R157 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP Q403 0TR162309CA KSC1623 TP SAMSUNG SOT23 NPN...
  • Page 31 DATE: 2003. 12. 15. DATE: 2003. 12. 15. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R259 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP R470 0RH0000D622 0 1/10W P-TYPE TAPPING R260 0RJ0222D677 22 OHM 1/10 W 5% 1608 R/TP...
  • Page 32 6612F00006E KJA-PH-3-0032 KSD 3.5PHI 14P R583 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP TU701 6700NF0004B TAFH-H001P LG INOTEK NTSC FS R585 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP R586 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP VIDEO BOARD...
  • Page 33: Pin Configuration

    PIN CONFIGURATION BA7657 Multimedia ICs BLOCK DIAGRAM Red 1 input HD 1 input HD Sync Signal detector HD 2 input Green 1 input HD output Ground Red output DET. Blue 1 input Ground Green output Composite video input Red 2 input (Sync on Green) Syncsepa Ground...
  • Page 34: Block Diagram

    GM1501 GENESIS 406P Parallal 2-wlre JTAG IF/extermal Serial I/F GPIO micro Pulse wldth X186 External Bandwidth Infra-red Rx Modulator Interface Micro- ROM I/F controller 14,318 MHz Internal Internal Grystal Clock Reference Generation TTL/ Panel Data LVDS /Control DVI-Compliant Input Ultra-Reliable Display DDC2Bi DVI Rx...
  • Page 35: Schematic Diagram

    SCHEMATIC DIAGRAM 1. TUNER/AV/PC INPUT - 35 -...
  • Page 36 2. VIDEO - 36 -...
  • Page 37 3. SCALER - 37 -...
  • Page 38 4.AUDIO CTL/AMP/RS232 - 38 -...
  • Page 39 5.POWER/CONNECTOR - 39 -...
  • Page 40 6. TUNER - 40 -...
  • Page 41 Blank Page1...
  • Page 42 Blank Page2...
  • Page 43 Blank Page3...
  • Page 44 Dec. 2003 P/NO : 3828TSL093E Printed in Korea...

This manual is also suitable for:

L172wal-al series