LG FLATRON E1940T Service Manual

Color monitor

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Owner's manual (40 pages)

Guía del usuario (39 pages)

User manual (38 pages)

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COLOR MONITOR

SERVICE MANUAL

MODEL:

CMO L01 A**TAV for AUO V6 )

CAUTION

BEFORE SERVICING THE UNIT,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

*To apply the Novatek Chip.

Only for training and service purposes

E1940T

( E1940T-PNT.A**PAV for

**Sales Market

North/Latin America

Europe/Africa

Asia/Oceania

- 1 -

Internal Use Only

http://aic.lgservice.com

http://eic.lgservice.com

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Table of Contents

Summary of Contents for LG FLATRON E1940T

Page 2: Table Of Contents
Height: 37.35 cm (14.70 inches) 3) Input impedance: 75 Ω 8. WEIGHT (excl. packing) Weight: 2.4 kg (5.29 lbs) Copyright © 2010 LG Electronics. Inc. All right reserved. - 2 - LGE Internal Use Only Only for training and service purposes...
Page 7: Timing Chart
H(Pixels) 60.123 1312 1024 1024 x 78.75 V(Lines) 75.029 H(Pixels) 47.712 1792 1360 1360 x 85.5 V(Lines) 60.015 Copyright © 2010 LG Electronics. Inc. All right reserved. - 7 - LGE Internal Use Only Only for training and service purposes...
Page 8: Disassembly
Consequently, pull the base directly. The base. Use tool to open all latches. Put the front face down, disassembly back cover. Copyright © 2010 LG Electronics. Inc. All right reserved. - 8 - LGE Internal Use Only Only for training and service purposes...
Page 9 Unscrew the 4 screws on the main board. Remove the main board and the power board. The panel. Remove the bezel. Copyright © 2010 LG Electronics. Inc. All right reserved. - 9 - LGE Internal Use Only Only for training and service purposes...
Page 10 Disassemble the rear cover and the hinge ASS’Y. Disassemble the hinge and stand. Hinge top, hinge and stand. Copyright © 2010 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only Only for training and service purposes...
Page 11: Block Diagram
U401 CN102 Panel Power CN302 to Panel sequence control circuit Block Q302 Q301 3.3V U701 Power input CN702 Copyright © 2010 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only Only for training and service purposes...
Page 12 Boost Circuit OVP circuit ON/OFF Current balance ON/OFF circuit Feedback Control IC ta9690 Current circuit Feedback DIM circuit Copyright © 2010 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only Only for training and service purposes...
Page 13: Discription Of Block Diagram
The Micom distinguishes polarity and frequencies of the H/V sync are supplied from signal cable. The controlled data of each mode is stored in scalar. Copyright © 2010 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only...
Page 14 5. OVP circuit: set the maximum output voltage of OVP, through this voltage IC can neglect the OPEN’s string. 6. Current feedback: LED feedback current detection. Copyright © 2010 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only...
Page 15: Adjustment
4) Scan serial No. to DDC recorder by Bar Reader, then read again in the Verify SN. 5) According to the message of DDC program, when the picture as fig.1 appears, it show DDC record has finished. Fig.1 Copyright © 2010 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only...
Page 17: Service Mode
R/G/B-sRGB: Allows you to set the R/G/B- sRGB value manually. Connect to the PC Connect to the monitor Figure 1 Cable Connection for Micom uploading Copyright © 2010 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only Only for training and service purposes...
Page 18: Troubleshooting Guide
Check CN702 or replace U701 PIN2=3.3V U701 Check X401 oscillate Replace X401 waveforms are normal Replace U401 Copyright © 2010 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only Only for training and service purposes...
Page 19 Check C706,C707,C708,C709 PIN 2 =3.3V? Check BL ON/OFF pulse as Check CN702 contacting scope PIN 8 =5V? LIPS Copyright © 2010 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only Only for training and service purposes...
Page 20 D-SUB to Scaler pin 41 H Sync ? pin 42 V Sync? Trouble in cable or LCD module Copyright © 2010 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only Only for training and service purposes...
Page 21 41 H Sync? Check H/V sync line pin 42 V Sync? Trouble in cable or LCD module Copyright © 2010 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only Only for training and service purposes...
Page 22 Check FB701,C716 CN701=12V? Check Vout about Check L801,D801,Q801 35V? Check main board Check main board Replace panel Copyright © 2010 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only Only for training and service purposes...
Page 23 Check Interface section or Check ON/OFF main board signal Check DIM Check U401 Check PANEL_VCC Check Q301,Q302 Copyright © 2010 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only Only for training and service purposes...
Page 24: Wiring Diagram
095G801412X933 095G802210W506 095G8014 8X913(CMO) S95G176T10517 (AUO) 095G176J 12507 (CMO) 095G820H 6D522 S95G176T12508 (CMO) Copyright © 2010 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only Only for training and service purposes...
Page 25: Exploded View
EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Page 26: Schematic Diagram
I/O2 I/O3 4K7 1/16W 5% 4K7 1/16W 5% C118 C119 AZC199-04S DVI_SCL R121 100OHM1/16W DVI_SDA R122 100OHM1/16W DDC_WP M24C02-RMN6TP GND POWER DGND Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 27 LED_GRN/BLUE 5 KEY1 KEY2 LED_ORG POWER_KEY # LED_GRN/BLUE LED_ORG C431 C432 C433 C434 C435 CONN VCC3.3 FB402 LF_B LF_B C436 NC/100N 16V Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 28 100N 16V R704 on_BACKLIGHT_1 5 22K 1/16W 5% U702 LMBT3904LT1G NC/AP1117D33L-13 VCC3.3 R705 1K 1/16W 5% BKLT-VBRI adj_BACKLIGHT 5 R706 100OHM1/16W Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 29 PA3/PWM5 12MHz 1M 1/16W 5% R419 10K1/16W LED_C PA1/PWM3 R420 NC/10K 1/16W 5% LED_B OSCO PA2/PWM4 PA0/PWM2 PPWR_ON# C421 22pF NT68668FG Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 30 R839 0R05 1/4W DRIVER R840 R874 0R05 1/10W R867 R877 Q804 0R05 1/4W 2N7002K R876 Q803 10K 1/10W 2N7002K Q806 SST2907A Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 31 R803 ISEN1_4 R804 ISEN1_1 CN811 R805 ISEN1_3 R806 ISEN1_6 ISEN1_5 ISEN1_8 R807 ISEN1_4 Vout R808 ISEN1_1 ISEN2_7 R809 ISEN2_5 R810 ISEN2_4 Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 32 0R05 1/4W DRIVER R810 R874 R839 0R05 1/10W R840 R877 Q804 0R05 1/4W R867 2N7002K R876 Q803 10K 1/10W 2N7002K Q806 SST2907A Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
Page 33 R803 ISEN1_4 R804 ISEN1_1 CN811 R805 ISEN1_3 R806 ISEN1_6 ISEN1_5 ISEN1_8 R807 ISEN1_4 Vout R808 ISEN1_1 ISEN2_7 R809 ISEN2_5 R810 ISEN2_4 Copyright © 2010 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

LG FLATRON E1940T Service Manual

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