LG FLATRON M1721A Service Manual
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LG FLATRON M1721A Service Manual

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See also: Service Manual , User Manual
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : CL-81
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
M1721A (M1721A-BMF.A**NLF)
M1921A (M1921A-BMF.A**NLF)

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Summary of Contents for LG FLATRON M1721A

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-81 MODEL: M1721A (M1721A-BMF.A**NLF) M1921A (M1921A-BMF.A**NLF) ) **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 ......16 SERVICE PRECAUTIONS ........4 WIRING DIAGRAM ..........20 TIMING CHART ............7 EXPLODED VIEW...........21 DISASSEMBLY ............8 REPLACEMENT PARTS LIST .......23 BLOCK DIAGRAM ........... 9 DESCRIPTION OF BLOCK DIAGRAM ....10 SCHEMATIC DIAGRAM .........

  • Page 3: 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 350...

  • Page 4: 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 5: Block Diagram

    BLOCK DIAGRAM - 9 -...

  • Page 6: Description Of Block Diagram

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

  • Page 7: Lips Board 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 8: Adjustment

    EDID 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 9 AUDIO ANTENNA IN (RGB) IN RGB(PC/DTV) IN VIDEO AUDIO (Mono) S-VIDEO AV IN 2 Video Signal Compatible PC Generator PARALLEL PORT Power inlet (required) 4.7K Power Select Switch 4.7K (110V/220V) 74LS06 Power LED 4.7K 74LS06 ST Switch V-Sync On/Off Switch (Switch must be ON.) Figure 1.
  • Page 10 ADC ADJUSTMENT 1. DCXO setting in Video (AV2) ■ Convert to AV2 in Input-source ■ Signal equipment display Output Voltage : 700 mVp-p Impress Resolution : NTSC J (Model No.207 at MSPG925L) Pattern : Color Bar (Pattern No.33 ant MSPG925L) 1) IN-START selection of Service Remote Controller 2) OPTION4 Selection 3) Right button selection in DCXO-AUTO(AV2).

  • Page 11: Service Osd

    3. RGB-PC input ADC ■ Signal equipment display Output Voltage : 730 mVp-p Impress Resolution : SXGA (Model No.45 at MSPG925L) Pattern : Gray pattern that left & right is black and center is white signal (Pattern No.28 ant MSPG925L) 1) If Source change from AV2 to RGB-PC, Monitor executes auto intelligent.

  • Page 12: 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 Q402 Q402 Fail Pass Check Output of Change U406 U406 Fail Pass Change LED Assy Check LED Assy...
  • Page 13 :[B]Process No Raster Check LED Status Repeat A PROCESS on display unit Fail Pass Check Change U402, U403, U402, U403, U406 U406 Fail Pass Check the input/ Change U301 Output of U301 Fail Pass Check inverter Change inverter Connector or inverter connector or inverter Fail Pass...
  • Page 14 No Raster on AV Signal No Raster on TV(RF) signal (CVBS, S-VHS) TN200 (TUNER PACK ASSY) Check 5V, 33V of TU701 Repeat Check the output of Re-soldering or [A] Process Fail Fail TU701 Change the defect part Pass Pass Check the signal of Change L109, L110, L112 L109, L110, L112 R194, R198, R184...
  • Page 15 No Sound Check the Change source input input source Fail Pass Re-soldering or Check the input/output Change the defect part of U301 Fail Check X301 Pass Re-soldering or Check the input/output Change the defect part of U201 Fail Pass Check the speaker Change speaker Fail Pass...

  • Page 16: Exploded View Parts List

    EXPLODED VIEW PARTS LIST * Note: Safety mark Ref. No. Part No. Description EAB32761501 Speaker,Fullrange, L07030A-027 ND35 3W 16OHM 85DB 300HZ 30 X 70 X 22 SOLDER SUNLINK COMPANY 6410TMW004A Power Cord, UC,LP-45 & H05VV-F 0.75_3C, LS-60_1.87M_BLK LP-45 LS-60 1.87M - 250V 10A H05VV-F 3X0.75MM2 BLACK INMETRO N LONGWELL COMPANY EAJ32188801 LCD,Module-TFT, LM170E03-TLB3 DRIVER 17.0INCH 1280X1024 300CD COLOR 72% 5/4 800 VS 1 5MS, 160/160, 4LAMP, 2CH-LVDS EAJ32189001...

  • Page 17: 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: 2006. 10. 27. DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 18 DATE: 2006. 10. 27. DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C3046 0CE475WJ6DC MVK4.0TP35VC4.7M 4.7uF 20% 3 C347 0CH3104K566 0805B104K500CT 100nF 10% 50V C3047 0CK474CH94A 0603F474Z250CT 470nF -20TO+8 C348 0CH3104K566...
  • Page 19 DATE: 2006. 10. 27. DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C425 0CH3105H946 C2012Y5V1E105ZT 1uF -20TO+80 U409 0ISS780500H KA78M05RTM 7TO20V 5V - DPAK C704 0CH3104K566 0805B104K500CT 100nF 10% 50V U704 0ISS780500H...
  • Page 20 DATE: 2006. 10. 27. DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION Q302 0TR127009AA KTA1270-Y(KTA562TM) PNP -5V R135 0RJ1102D677 MCR03EZPJ113 11KOHM 5% 1/10W Q303 0TR390409AE KST3904 NPN 6V 60V 40V 200MA R136 0RH4701D622 MCR10EZHJ472 4.7KOHM 5% 1/8W...
  • Page 21 DATE: 2006. 10. 27. DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R254 0RJ1001D677 MCR03EZPJ102 1KOHM 5% 1/10W R352 0RH1000D622 MCR10EZHJ101 100OHM 5% 1/8W R260 0RH3302D622 MCR10EZHJ333 33KOHM 5% 1/8W R355 0RJ1000D677...
  • Page 22 DATE: 2006. 10. 27. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs Q203 0TFRH80001A RK7002T116 N-CHANNEL MOSFET U303 6620F00017A CCSD-32T-SM 32P 1.27MM SMD T U405 0TFVI80067A SI3865BDV(E3) N-CHANNEL MOSF U406 0TF492509AA SI4925DY P-CHANNEL -30V +-20 X301 6202TST003G HC-49/SM5H 24.576MHZ 30PPM 2 CONTROL BOARD C6000 0CN1040K949...

  • Page 23: Schematic Diagram

    SCHEMATIC DIAGRAM 1. CONNECTOR & JACK - 29 -...
  • Page 24 2. AUDIO AMP - 30 -...
  • Page 25 3. SCALER & MEMORY - 31 -...
  • Page 26 4. POWER - 32 -...
  • Page 27 5. TUNER / LVDS - 33 -...
  • Page 28 6. TN200 TUNER PACK - 34 -...
  • Page 29 7. LIPS-1 - 35 -...
  • Page 30 7. LIPS-2 - 36 -...
  • Page 31 8. CONTROL PCB - 37 -...
  • Page 32 9. LED-IR - 38 -...

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