LG Flatron L226WTQ Service Manual
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LG Flatron L226WTQ Service Manual

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COLOR MONITOR

SERVICE MANUAL

CHASSIS NO. : LM74B
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
L226WTQ(L226WTQ-BFS.A**MQP,A**QQP,A**VQP)
L226WTQ(L226WTQ-WFS.A**OAP,A**QAP,A**VAP)
Website:http://biz.LGservice.com

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Summary of Contents for LG Flatron L226WTQ

  • Page 1: Color Monitor

    Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM74B MODEL: L226WTQ(L226WTQ-BFS.A**MQP,A**QQP,A**VQP) L226WTQ(L226WTQ-WFS.A**OAP,A**QAP,A**VAP) ) **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 ......15 TIMING CHART ............8 EXPLODED VIEW...........19 DISASSEMBLY ............9 REPLACEMENT PARTS LIST .......21 BLOCK DIAGRAM ..........10 DESCRIPTION OF BLOCK DIAGRAM....11 SCHEMATIC DIAGRAM ......... 24 SPECIFICATIONS 1.
  • Page 3 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. Data0- T. M. D. S. Data2+ T. M. D. S. Data2/4 Shield T. M. D. S. Data0+ 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: 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 6 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 7 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 8: Timing Chart

    TIMING CHART VIDEO SYNC Total Video Sync Front Blanking Sync MODE H / V Frequency Duration Porch Time Resolution Period Active Polarity Clock ( E ) Time ( A ) ( D ) ( C ) ( B ) H(Pixels) 28.321 31.468 720 X 400...

  • Page 9: Disassembly

    DISASSEMBLY Remove the screws. Remove the screws. 1. Pull the front cover upward. 2. Then, let the all latches are separated with jig. (#3~4) 1.Disassemble PCB. Disassemble PCB. 2. Put the front face down. Disassemble back cover - 9 -...

  • Page 10: Block Diagram

    BLOCK DIAGRAM - 10 -...

  • Page 11: 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 146MHz In L226WTQ/WTG.

  • Page 12: Lips Board Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 67KHz HVDC ENERGY INPUT RECTIFIER OUTPUT RECTIFIER TRANSFER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- CONTROL COUPLER CIRCUIT ISOLATION PRIMARY SECONDARY Operation description_Power 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 13: 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 => Doesn’t need setup Windows 2000, XP => Need to Port Setup. This program is available for LCD Monitor only. 1.

  • Page 14: Service Osd

    SERVICE OSD 1) Turn off the power switch at the right side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch for 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) CLEAR ETI : To initialize using time.

  • Page 15: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, AND FIND OUT A SHORT CHECK J905 VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK U901(3.3V) IS U901 PIN2(3.3V) U902(1.8V) LINE U902 PIN2(1.8V) CHECK X501 PIN127 CHECK CRYSTAL(X501) PULSE CHECK U501...
  • Page 16 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK J905 CHECK POWER BOARD VOLTAGE PIN5,6 (LIPS) (5V)? CHECK U501 INVERTER J905 PIN9 3.3V? ON/OFF PORT 1. CONFIRM BRIGHTNESS OSD CONTRL STATUS CHECK J905 2.
  • Page 17 3. NO RASTER (OSD IS NOT DISPLAYED) - MAIN NO RASTER (OSD IS NOT DISPLAYED) CHECK U501 CHECK U901(3.3V), PIN114(3.3V) U902(1.8V) PIN21(1.8V) 1. CHECK PIN 127,128 U501 SOLDERING CONDITION PIN 127,128 2. CHECK X501 14.3MHZ? 3. TROUBLE IN U501 CHECK U501 PIN32(H-SYNC) AND CHECK CONNECTION LINE PIN33(V-SYNC).
  • Page 18 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK R718 AND PC IS GOING R719, SYNC INTO DPM MODE APPEARED? CHECK U501 PIN 32,33 CHECK H/V SYNC LINE SYNC PULSE TROUBLE IN U501 Waveforms 1 H-SYNC 2 V-SYNC - 18 -...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...

  • Page 20: Exploded View Parts List

    Part No. Description EAJ33945801 LCD,Module-TFT, LM220WE1-TLA1 DRIVER 22.0INCH 1680X1050 300CD COLOR 72% 16/10 800:1 160/160 5ms 4LAMPS LG PHILIPS LCD EAJ33527501 LCD,Module-TFT, M220Z1-L01 ZBD DRIVER 22.0INCH 1680X1050 300CD COLOR 72% 16/10 700:1 4CCFL, 2CH-LVDS, 5MS, 170/160 CHI MEI OPTOELECTRONICS CORP or EAJ33527502 LCD,Module-TFT, M220Z1-L01 NON-ZBD DRIVER 22.0INCH 1680X1050 300CD COLOR 72% 16/10 700:1 4CCFL, 2CH-LVDS, 5MS, 170/160 CHI MEI OPTOELECTRONICS CORP...

  • Page 21: Replacement Parts List

    REPLACEMENT PARTS LIST DATE: 2007. 05. 15. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C532 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K1" SAB30926101 "S/W PackageKR015457 L196WTG/Q, L" C533 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K1" SAB30926103 S/W PackageSAB30926103 L196WTG/Q C534 0CK104CF56A "Capacitor,Ceramic,Chip0603B104K1" SAB30571102 S/W PackageL226WT-SFQ CD ASSY US C535...
  • Page 22 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION DIODEs RESISTORs D701 0DS226009AA "Diode,SwitchingKDS226 1.2V 85V 3" 0RJ7501D677 "Resistor,ChipMCR03EZPJ752 7.5KOH" D702 0DS226009AA "Diode,SwitchingKDS226 1.2V 85V 3" 0RJ7501D677 "Resistor,ChipMCR03EZPJ752 7.5KOH" D703 0DS226009AA "Diode,SwitchingKDS226 1.2V 85V 3" 0RJ1201D677 "Resistor,ChipMCR03EZPJ122 1.2KOH"...
  • Page 23 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R724 0RJ4701D677 "Resistor,ChipMCR03EZPJ472 4.7KOH" 0DLGP0128AA "LED,ChipGPTD1210YBC BLUE/YELLOW" R725 0RJ4701D677 "Resistor,ChipMCR03EZPJ472 4.7KOH" 3918TKK038S Packing(1030*820) FOR LG130AL G R726 0RJ4701D677 "Resistor,ChipMCR03EZPJ472 4.7KOH" MFZ33027201 PackingMOLD EPS L225WA EPS EPS F R727 0RJ4701D677 "Resistor,ChipMCR03EZPJ472 4.7KOH"...
  • Page 24 PRINTED CIRCUIT BOARD MAIN (TOP) MAIN (BOTTOM) - 24 -...
  • Page 25 CONTROL - 25 -...

  • Page 26: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 26 -...
  • Page 27 2. POWER & WAFER - 27 -...
  • Page 28 3. CONTROL - 28 -...
  • Page 29 May. 2007 P/NO : MFL38456741 Printed in Korea...

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