LG Flatron L1751S-SN Service Manual

Lg color monitor service manual

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Service Guide Specification

Model Description

L1751S-S/BNN

MODEL

L1951S-S/BNN

SUFFIX

ANUSQF

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 :

Special Instructions

(1) Origin Notification

* LGEDI : Printed in Indonesia

* LGESP : Printed in Brazil

* LGENT : Printed in China

Changes

REV.

MM/DD/YY

NO.

BRAND

Product Name

215mm x 280 mm

Saddle stitch

English

28 (Including blank 1page)

* LGEWA : Printed in U.K.

* LGEMX : Printed in Mexico

* LGEIL : Printed in India

CHANGE NO.

FLATRON L1751S-SN/BN

FLATRON L1951S-SN/BN

CHANGE

Part No.

3828TSL082S

CONTENTS

Table of Contents

Summary of Contents for LG Flatron L1751S-SN

Page 1 Service Guide Specification Service Guide Specification Model Description L1751S-S/BNN MODEL BRAND L1951S-S/BNN Part No. 3828TSL082S FLATRON L1751S-SN/BN SUFFIX ANUSQF Product Name FLATRON L1951S-SN/BN 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 blank …. ….. English English English English English Rear cover Rear Inside Cover ….
Page 3 Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR SERVICE MANUAL CHASSIS NO. : CL-82 MODEL: L1751S-SN (L1751S-SNN.AN**QF) L1751S-BN (L1751S-BNN.AN**EF) L1951S-SN (L1951S-SNN.AN**QF) L1951S-BN (L1951S-BNN.AN**EF) ) **Same model for Service CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. *To apply the Genesis ZAN3SL Chip.
Page 4 Blank Page1...
Page 5: Table Of Contents
CONTENTS SPECIFICATIONS ........... 2 SERVICE OSD ............13 PRECAUTIONS ............3 TROUBLESHOOTING GUIDE ......14 TIMING CHART ............7 WIRING DIAGRAM ..........18 DISASSEMBLY ............8 EXPLODED VIEW...........19 BLOCK DIAGRAM ........... 9 REPLACEMENT PARTS LIST .......21 DESCRIPTION OF BLOCK DIAGRAM....10 ADJUSTMENT ............
Page 6: 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 7: 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 8 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 9 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 10: Timing Chart
TIMING CHART VIDEO SYNC << Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Total Front Back Sync. Display Mode Section Polarity Frequency Resolution Period Porch Porch Clock ( C ) ( A ) ( E ) ( D ) ( B )
Page 11: Disassembly
DISASSEMBLY Disassembly Hinge Cover. Remove the screws. Disassemble back cover. 1. Pull the front cover upward. 2. Then, let the all latches are separated. 3. Put the front face down. Pell off Al-tape from panel. Remove the 6 screws from each up of metal frame. Remove Al-tape from control pcb fix.
Page 12: Block Diagram
BLOCK DIAGRAM - 9 -...
Page 13: 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 14: Lips Board Block Diagram
LIPS Board Block Diagram 50 ~ 60Hz 100KHz HVDC INPUT RECTIFIER ENERGY OUTPUT RECTIFIER COMPONENTS AND FILTER TRANSFER AND FILTER LINE 100 ~ 240V SIGNAL PWM CONTROL PHOTO -COUPLER COLLECT- CIRCUIT ISOLATION PRIMARY SECONDARY High Voltage output INVERTER CIRCUIT Operation description_LIPS 1.
Page 15: 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 16: 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 17: Troubleshooting Guide
TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK POWER BOARD, AND FIND OUT A SHORT CHECK J705 VOLTAGE POINT AS OPENING PIN5, PIN6 (5V)? EACH POWER LINE CHECK U801 PIN 1& U803 PIN CHECK U801. 3 VOLTAGE (5V) ? CHECK CHECK 5VR LINE...
Page 18 2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) J705 PIN5, PIN 6 CHECK LIPS CHECK MICOM INV ON/OFF J705 PIN9 PORT. 2.5V? (U501 PIN9) 1. CONFIRM BRIGHTNESS OSD CONTRL STATE. J705 PIN10 2. CHECK MICOM DIM-ADJ PORT(U501 PIN41) CHECK PULSE AS...
Page 19 3. NO RASTER (OSD IS NOT DISPLAYED) – gmZAN3SL NO RASTER (OSD IS NOT DISPLAYED) U201 CHECK U803, U801 POWER PINS 3.3V? U201 1. CHECK PIN88 PIN88 SOLDERINGCONDITION OSCILLATE AS 2. CHECK X501 12MHZ? 3. TROUBLE IN U201 U501 PIN43 IS 64KHz H-SYNC? CHECK CONNECTION LINE PIN44 IS 60Hz V-SYNC? FROM U201 TO U501...
Page 20 4. NO RASTER (OSD IS DISPLAYED) – gmZAN3SL NO RASTER (OSD IS DISPLAYED) U201 POWER PIN99(1.8V) CHECK U803, U801 PIN33(3.3V)? CHECK 1. CHECK PC R,G,B INPUT? 2. CHECK SIGNAL CABLE & U201 PIN 70,74,77 D-SUB CONNECTOR LINE CHECK CHECK H-SYNC LINE H-SYNC INPUT →...
Page 21: Wiring Diagram
WIRING DIAGRAM Connector Ass’y P/N 6631T11012W or 6631T11020W Connector Ass’y P/N: Connector Ass’y P/N: 6631T20023A 6631T11017X-L1751S or 6631T20034M 6631T11017Y-L1951S - 18 -...
Page 22 - 19 -...
Page 23: Exploded View Parts List
CABINET ASSEMBLY, L1951S BRAND L137 PC+ABS 9930 BLACK TCO99 US-VER P-CKD 6304FLP110B LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A5N5 LG PHILPS TFT COLOR PART NUMBER CHANGE FOR COST COMPENSATION or 6304FLP199A LCD(LIQUID CRYSTAL DISPLAY), LM170E01-A6K3 LG PHILPS TFT COLOR 8MS,LPL NJ/KUMI,PB FREE,EGI,SS S D-IC,EGI,250NITS,SXGA,LVDS...
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. 04. 12. DATE: 2005. 04. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC.
Page 25 DATE: 2005. 04. 12. DATE: 2005. 04. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION OTHERs R523 0RJ4701D677 4.7K OHM 1/10 W 5% 1608 R/TP R534 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP X501 6212AA2004A HC-49U TXC 12.0MHZ +/- 30 PP...
Page 26: Schematic Diagram
SCHEMATIC DIAGRAM 1. SCALER - 23 -...
Page 27 2. MICOM - 24 -...
Page 28 3. POWER - 25 -...
Page 29 4. CONNECTOR & JACKS - 26 -...
Page 30 Apr. 2005 P/NO : 3828TSL082S Printed in Korea...

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LG Flatron L1751S-SN Service Manual

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