LG 19LS350S Service Manual page 21

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
Normal audio audio
Move to No
video/No audio
※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
Error
symptom
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
N
☞A2
Check Power Board 24v output
A. Video error
☞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
Established
2012. 01 .14
date
Revised date
Y Replace T-con
Normal
Board or module
voltage
N
Repair Power
Board or parts
End
Re-enter White Balance value
1/14
LGE Internal Use Only