LG Flatron M1721A Service Manual
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LG Flatron M1721A Service Manual

Color monitor
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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LP68A
MODEL:
*(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website:http://biz.LGservice.com
M1721A (M1721A-BZH.A**OPP)
M1921A (M1921A-BZH.A**OPP)

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Summary of Contents for LG Flatron M1721A

  • Page 1 Website:http://biz.LGservice.com COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LP68A MODEL: M1721A (M1721A-BZH.A**OPP) M1921A (M1921A-BZH.A**OPP) ) **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 ............12 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 SERVICE PRECAUTIONS ........4 WIRING DIAGRAM ..........18 TIMING CHART ............7 EXPLODED VIEW...........19 DISASSEMBLY ............8 REPLACEMENT PARTS LIST .......21 BLOCK DIAGRAM ........... 9 SCHEMATIC DIAGRAM ......... 27 DESCRIPTION OF BLOCK DIAGRAM ....

  • 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: Service 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 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 Period Active Duration Porch Time Resolution Polarity Clock ( E ) Time ( A ) ( D ) ( C ) ( B ) H(Pixels) 25.175 31.469 640 x 400...

  • Page 8: Disassembly

    DISASSEMBLY Separate body & stand base. Hold the stand body & stand base. Remove the screws. 1. Let the all latches are separated 2. Disassemble back cover. Disassemble Connector. - 8 -...

  • Page 9: Block Diagram

    BLOCK DIAGRAM RS-232C (Option) - 9 -...
  • Page 10 DESCRIPTION OF BLOCK DIAGRAM 1. Power Supply Block (LIPS) This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240 V, 50/60 Hz, 1.0A) Also it has the inverter function that converts input voltage to AC Rms value for the LCD lamp. 2.

  • Page 11: Description Of Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC ENERGY INPUT RECTIFIER OUTPUT RECTIFIER TRANSFER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- COMTROL COUPLER CIRCUIT ISOLATI ON PRIMARY SECONDARY 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 12: 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 13: Service Osd

    SERVICE OSD BLUEBIRD3 - LP68A Description of operation - Tool Option : Adjust Tool Option Version 2.04 070129 - Area Option : Adjust Area Option M1721A SXGA LPL-17 - Option 1 : Adjust Tuner Service Option - Option 2 : Adjust Sound Service Option - Option 3 : Adjust Local key Tool Option 8065...

  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE No power :[A]Process (LED indicator off) Check short of main B/D Check 15V or 5V or Change Lips of Lips Fail Pass Pass Check Output of Change Q904 Q904 Fail Pass Check Output of Change IC903 IC903 Fail Pass Change LED Assy Check LED Assy...
  • Page 15 :[B]Process No Raster Check LED Status Repeat A PROCESS on display unit Fail Pass Check Change IC900, IC901, IC900, IC901, IC906, IC908, IC906, IC908, IC909, Fail IC909, IC910 IC910 Pass Check the input/ Change IC100 Output of IC 100 Fail Pass Check inverter Change inverter...
  • Page 16 No Raster on AV Signal No Raster on TV(RF) signal (Component, CVBS, S-VHS) Check 5V of TU500. Repeat Check the output Re-solder or change the [A] Process of TU500 Fail Fail defect part Pass Pass Change R104, R106, Check the signal of R108, R131, L822, L800, R104, R106, R108, R131 Fail...
  • Page 17 No Sound Check the Change source input input source Fail Pass Re-soldering or Check the input/output Change the defect part Fail of IC100 Check X301 Pass Re-soldering or Check the input/output Change the defect part of IC400 Fail Pass Check the speaker Change speaker Fail Pass...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM 6631900024D 6631T900055A 6631900042B 6631T20038G EAB32761501 - 18 -...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 20 Main Total Assembly, M1721A-BZH BRAND LP68A EBU36609101 Main Total Assembly, M1921A-BZH BRAND LP68A 6871TPT318G PCB Assembly,Power, PLLM-M602B POWER T.T CMO L225W 22"Wide Scaler Dimming FREQENCY CHANGE LG INNOTEK CO., LTD ACQ31008501 Cover Assembly, M1721/M1921 CL-81 ETC HINGE COVER ASSY, RAVEN BLACK MCK32045601...

  • Page 21: 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: 2007. 01. 30. DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 22 DATE: 2007. 01. 30. DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C404 0CK224DH56A 0805B224K250CT 220nF 10% 25V C745 0CE106WFKDC MVK4.0TP16VC10M 10uF 20% 16V C405 0CK105CF94A 0603F105Z160CT 1uF -20TO+80% C746 0CC561CK41A...
  • Page 23 DATE: 2007. 01. 30. DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD706 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60 L271 6210TCE001A HB-1S2012-080JT 8OHM 2X1.25X ZD707 0DZ560009DA UDZS5.6B 5.6V 5.49TO5.73V 60 L400 6210TCE001G HH-1M3216-501JT 500OHM 3.2X1...
  • Page 24 DATE: 2007. 01. 30. DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1053 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W R169 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W R1054 0RJ0222D677 MCR03EZPJ220 22OHM 5% 1/10W R171 0RJ1000D677...
  • Page 25 DATE: 2007. 01. 30. DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R509 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W R827 0RJ1002D677 MCR03EZPJ103 10KOHM 5% 1/10W R512 0RJ1500D677 MCR03EZPJ151 150OHM 5% 1/10W R834 0RJ9101D677...
  • Page 26 DATE: 2007. 01. 30. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION SW4000 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW4001 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW4002 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW4003 140-058B EVQPB205K 1C1P 15VDC 0.02A V SW4004 140-058B EVQPB205K 1C1P 15VDC 0.02A V...

  • Page 27: Schematic Diagram

    SCHEMATIC DIAGRAM 1. MSTAR - 27 -...
  • Page 28 2. PANEL & CONNECTOR - 28 -...
  • Page 29 3. SDRAM - 29 -...
  • Page 30 4. AMP - 30 -...
  • Page 31 5. TUNER - 31 -...
  • Page 32 6. DVI & VGA - 32 -...
  • Page 33 7. SCART & COMPONENT - 33 -...
  • Page 34 - 34 -...
  • Page 35 9. POWER - 35 -...
  • Page 36 10. CONTROL - 36 -...
  • Page 37 11. IR & LED - 37 -...
  • Page 38 Jan. 2007 P/NO : MFL36713661 Printed in Korea...

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