A. Video Error - LG 55LW5700 Service Manual

Standard Repair Process
LCD TV
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,,,)
No video
Normal audio
Move to No
video/No audio
※Precaution
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright ⓒ 2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Error
symptom
☞A1
Y
Normal Check Back Light
audio On with naked eye
N
☞A2
Check Power Board 24v output
☞A7 & A3

A. Video error

No video/ Normal audio
☞A4
Y Check Power
On
Board
12v,3.5v etc.
N
Replace Inverter
Normal Y
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
1
Established
2010. 12 .14
date
Revised date
Y Replace T-con
Normal
Board or module
voltage
And Adjust VCOM
☞A28
N
Repair Power
Board or parts
End
Re-enter White Balance value
ⓒ LG Electronics. Inc.2009
1/13
LGE Internal Use Only