Download LG Electronics 42LM340S Flat Panel Television User Manual

Standard Repair Process
Error
symptom
LCD TV
A. Video error
Established
date
No video/ Normal audio
Revised date
2012. 01 .14
1/14
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
☞A1
No video
Normal audio
Normal
audio
Y
☞A4
Check Back Light
On with naked eye
N
Move to No
video/No audio
Y
On
Check Power
Board
12v,3.5v etc.
N
☞A2
Y
Replace T-con
Board or module
N
Repair Power
Board or parts
Check Power Board 24v output
Normal
voltage
Normal
voltage
Y
Replace Inverter
or module
N
End
Repair Power
Board or parts
※Precaution
☞A6 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Replace Main Board
Re-enter White Balance value
LGE Internal Use Only