LG FLATRON L1770HQ Service Manual
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LG FLATRON L1770HQ Service Manual

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COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM51C
MODEL:
(
) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
E-mail:http://www.LGEservice.com/techsup.html
L1770HQ (L1770HQ-BFQ.AX**QP, AG**QP)
L1970HR (L1970HR-BFQ.AR**QP)
Website:http://biz.LGservice.com
*To apply the MSTAR Chip.

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Summary of Contents for LG FLATRON L1770HQ

  • Page 1 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : LM51C MODEL: L1770HQ (L1770HQ-BFQ.AX**QP, AG**QP) L1970HR (L1970HR-BFQ.AR**QP) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the MSTAR Chip.

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............14 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......15 TIMING CHART ............7 WIRING DIAGRAM ..........19 DISASSEMBLY ............8 EXPLODED VIEW...........20 BLOCK DIAGRAM...........10 REPLACEMENT PARTS LIST .......21 DISCRIPTION OF BLOCK DIAGRAM ....11 ADJUSTMENT ............13 SCHEMATIC DIAGRAM .........

  • Page 3: Precautions

    PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING • There are some special components used in LCD BE CAREFUL ELECTRIC SHOCK ! 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 Total Video Sync Front Blanking Sync MODE H / V Frequency Duration Porch Time Resolution Period Active Polarity Clock ( D ) ( C ) ( B ) ( E ) Time ( A ) H(Pixels) 25.175 31.469 640 x 350...

  • Page 8: Disassembly

    DISASSEMBLY Remove the screws. Disassembly Hinge Cover. Pull out the cable. Remove the screws. 1. Pull the front cover upward. 1.Disassemble Control PCB. 2. Then, let the all latches are separated. 2. Put the front face down. Disassemble back cover - 8 -...

  • Page 9: Block Diagram

    BLOCK DIAGRAM - 9 -...

  • Page 10: Discription 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 from 25MHz to 135MHz.
  • Page 11 LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC SWITCHING INPUT RECTIFIER OUTPUT RECTIFIER TRANSFORMER COMPONENTS AND FILTER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- CONTROL COUPLER CIRCUIT ISOLATION PRIMARY SECONDARY High Voltage INVERTER CIRCUIT 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 1) Turn off the power switch at the front side of the display. 2) Wait for about 5 seconds and press MENU, POWER switch with 1 second interval. 3) The SVC OSD menu contains additional menus that the User OSD menu as described below. a) Auto Color : W/B balance and Automatically sets the gain and offset value.

  • Page 14: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, CHECK J202 AND FIND OUT A SHORT VOLTAGE POINT AS OPENING PIN1 (5V)? EACH POWER LINE CHECK CHECK 3.3V LINE U202 PIN 3 VOLTAGE (OPEN CHECK) (3.3V) ? NO PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE...
  • Page 15 2. NO RASTER (OSD IS NOT DISPLAYED) – INVERTER NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER LINE, J305 AND FIND OUT A SHORT PIN1, PIN2 POINT AS OPENING 12V? EACH POWER LINE CHECK MICOM INV J305 PIN7 ON/OFF PORT. 1.
  • Page 16 3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U101 PIN 16, 75 CHECK U202 3.3V? U101 1. CHECK C108, C109 SOLDERING CONDITION PIN96, 97 OSCILLATE AS 2. CHECK X101 14.31MHZ? 3. TROUBLE IN U101 U101 PIN27 IS 48KHz H-SYNC? CHECK CONNECTION...
  • Page 17 4. TROUBLE IN DPM TROUBLE IN DPM CHECK PC CHECK PC IS NOT GOING R332, R333 INTO DPM OFF MODE CHECK U101 PIN 27,28 CHECK H/V SYNC LINE SYNC PULSE ? TROUBLE IN U101 Waveforms 3 R333 V-Sync R332 H-Sync - 17 -...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM 6631900080A 6631T12006F 6631T12006L - 18 -...

  • Page 19: Exploded View

    EXPLODED VIEW - 19 -...
  • Page 20 LCD(LIQUID CRYSTAL DISPLAY), LM170E02-TLA2 LG PHILPS TFT COLOR DOT FREE OF LM170E02-TLA1,SUPER SLIM(12.8T),P5,645CH,300NITS,8MS,P 6304FHS014B LCD(LIQUID CRYSTAL DISPLAY), HSD190ME13-D10 HANNSTAR TFT COLOR 2/3/5 DOTS,300NITS 5MS 700VS1 TCO-03 or 6304FLP337A LCD(LIQUID CRYSTAL DISPLAY), LM190E03-TLBB LG PHILPS TFT COLOR DOT FREE OF LM190E03-TLB7,P4,645CH,300NITS,TN,8MS,LPL KUMI,PB FREE 3809900137F BACK COVER ASSEMBLY, L1770 NON C-CKD(BK,PC-ABS) 3809900138F...

  • 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: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 22 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C418 0CK104CK56A 0.1UF 1608 50V 10% R/TP X7R C419 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y U101 0IPRP00705A FE2031-LF(TSUM56AWL) MSTAR 1...
  • Page 23 DATE: 2006. 02. 06. DATE: 2006. 02. 06. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R133 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R409 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R134 0RJ1002D677 10K OHM 1/10 W 5% 1608 R/TP...

  • Page 24: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 24 -...
  • Page 25 2. POWER - 25 -...
  • Page 26 3. INPUT & WAFER - 26 -...
  • Page 27 4. VTIO 3601 - 27 -...
  • Page 28 Feb. 2006 P/NO : 38289S0041 Printed in Korea...

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Flatron l1970hr

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