LG FLATRON L1780Q Service Manual
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LG FLATRON L1780Q Service Manual

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Service Guide Specification
Service Guide Specification
1.
Model Description
L1780QN
MODEL
L1980QN
SUFFIX
ANEUG
2.
Printing Specification
1. Trim Size (Format) :
2. Printing Colors
• Cover :
LG COLORS
• Inside :
Black
3. Stock (Paper)
• Cover :
Snow White 150 g/
• Inside :
Snow White 100 g/
4. Printing Method :
5. Bindery :
6. Language :
7. Number of pages :
3.
Special Instructions
(1) Origin Notification
* LGEDI : Printed in Indonesia
* LGESP : Printed in Brazil
* LGENT : Printed in China
4.
Changes
8
7
6
5
4
3
2
1
REV.
MM/DD/YY
NO.
BRAND
Product Name
215mm x 280 mm
Saddle stitch
English
32
( Including blank 3pags)
* LGEWA : Printed in U.K.
* LGEMX : Printed in Mexico
* LGEIL : Printed in India
CHANGE NO.
LG
FLATRON L1780Q
FLATRON L1980Q
CHANGE
Part No.
3828TSL096T
CONTENTS

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Summary of Contents for LG FLATRON L1780Q

  • Page 1 Service Guide Specification Service Guide Specification Model Description L1780QN MODEL BRAND L1980QN Part No. 3828TSL096T FLATRON L1780Q SUFFIX ANEUG Product Name FLATRON L1980Q Printing Specification 1. Trim Size (Format) : 215mm x 280 mm 2. Printing Colors • Cover : LG COLORS •...
  • Page 2 Pagination sheet Pagination sheet Front cover English English English English English Cover Inside …. ….. English English English English English Rear cover Rear Inside Cover …. blank blank blank...
  • Page 3 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-68 MODEL: L1780Q (L1780QN.AN**G) L1980Q (L1980QN.AN**G) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. ( - ) ( - ) ( + ) MENU MENU ENGINE...

  • Page 4: Table Of Contents

    CONTENTS SPECIFICATIONS ........... 2 ADJUSTMENT ............14 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......16 TIMING CHART ............7 WIRING DIAGRAM ..........19 DISASSEMBLLY ............. 8 EXPLODED VIEW...........20 BLOCK DIAGRAM ..........11 REPLACEMENT PARTS LIST .......22 DESCRIPTION OF BLOCK DIAGRAM....12 SCHEMATIC DIAGRAM ......... 25 SPECIFICATIONS 1.

  • Page 5: 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 6: 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 7 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 8 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 9: Timing Chart

    TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Total Front Back Display Sync. Section Mode Polarity Frequency Period Porch Porch Resolution Clock ( A ) ( C ) ( E ) ( D ) ( B )

  • Page 10: Disassemblly

    Disassembly # 2-1 2-1. Hinge Rear Cover 1. Cover Ring Loosen the catch of the right latch as shown. Disassemble the cover ring by turning it counterclockwise as shown. #2-2 #3-1 Loosen the catch of the left latch of the hinge rear 3-1.
  • Page 11 # 3-4 # 4-1 � � � � � � � � � � Sequence of disassembling the back cover. Disassemble the stand assembly by lifting it up and out. # 4-2 Lift up the back cover a little by inserting a tool into the hole while pressing the cabinet on the bottom right of the back cover with your left hand.
  • Page 12 # 4-4 � # 4-4 � Lift up the cover with your left hand in the sequence 1~4 and open up the back cover with your right hand from the bottom left. # 4-4 � � # 4-4 5. Remove the OSD/Power panel Remove the two screws and separate cabinet and middle cover.

  • Page 13: Block Diagram

    BLOCK DIAGRAM - 11 -...

  • Page 14: 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 from 25MHz to 135MHz.

  • Page 15: Lips Board Block Diagram

    LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER SWITCHING OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFORMER AND FILTER LINE 100 ~ 240V SIGNAL PHOTO- COLLENT- CONTROL COUPLER CIRCUIT ISOLATI ON PRIMARY SECONDARY INVERTER CIRCUI T High Volta ge Operation description_LIPS 1.

  • Page 16: 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 17: 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 18: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK CHECK POWER J609 1,2,3 PIN ADAPTER 12V? U801 PIN 3 CHECK U801 IC U401 PIN 3 CHECK U401 3.3V? NO PROBLEM U402 PIN-3 1.8V? CHECK DATA LINE CHECK U201 CONNECTION VCC,XTAL,RESET WAVE FORM...
  • Page 19 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK U201 J603 PIN-7 3V ? CHECK U201 PIN-68 HIGH CHECK POWER J603 PIN-1,2 12V ? ADAPTER 12V CHECK INVERTER CHECK INVERTER LAMP PULSE J201 PIN-1,2 3.5V ? U201 PIN-67 HIGH? CHECK U201 U403 IC CHECK...
  • Page 20 3. TROUBLE IN DPM TROUBLE DPM CHECK U201 CHECK U201 PIN 181,182 TROBLE IN SIGNAL J609 PIN 15,16 CABLE TROUBLE IN PC - 18 -...

  • Page 21: Wiring Diagram

    WIRING DIAGRAM Connector Ass’y P/N: 6631T11020Q Connector Ass’y P/N: 6631T12006F Connector Ass’y P/N: 6631T12006E - 19 -...
  • Page 22 - 20 -...

  • Page 23: Exploded View Parts List

    CABINET ASSEMBLY, L1980UN BRAND 3090TKL110A ULTRA SLIM 3091TKL133B CABINET ASSEMBLY, L1980UN BRAND 3090TKL110A A-C/SKD 6304FLP201A LCD(LIQUID CRYSTAL DISPLAY), LM170E02-TL01 LG PHILPS TFT COLOR 8MS,SUPER SLIM,12.8T,SXGA,LVDS 6304FLP198A LCD(LIQUID CRYSTAL DISPLAY), LM190E04-A4K2 LG PHILPS TFT COLOR 8MS,SUPER SLIM,15.5T,TN,SXGA,LVDS 3809TKL090B BACK COVER ASSEMBLY, L1780UN 3808TKL088A ULTRA SLIM...

  • Page 24: 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: 2005. 02. 07. DATE: 2005. 02. 07. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
  • Page 25 DATE: 2005. 02. 07. DATE: 2005. 02. 07. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C816 0CH8107F611 100UF 16V M 85STD(CYL) R/TP R204 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R205 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP...
  • Page 26 DATE: 2005. 02. 07. DATE: 2005. 02. 07. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R606 0RJ0752D677 75 OHM 1/10 W 5% 1608 R/TP 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 R607 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP...

  • Page 27: Schematic Diagram

    SCHEMATIC DIAGRAM 1. SCALER - 25 -...
  • Page 28 2.DC/DC POWER - 26 -...
  • Page 29 3. CONNECTOR - 27 -...
  • Page 30 4. KEY - 28 -...
  • Page 31 Blank Page1...
  • Page 32 Blank Page2...
  • Page 33 Blank Page3...
  • Page 34 Feb. 2005 P/NO : 3828TSL096T Printed in Korea...

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