LG 37LV470S Service Manual page 42

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 ☞A7 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
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Only for training and service purposes
A. Video error
Error
symptom
No video/ Normal audio
☞A1
Y
Normal Check Back Light
audio On with naked eye
N
☞A2
Check Power Board 24v output
☞A4
Check Power
Y
On Board
12v,3.5v etc.
N
Normal Y Replace Inverter
voltage or module
N
Repair Power
Board or parts
Replace Main Board
Re-enter White Balance value
1
Established
2010. 12 .14
date
Revised date
Replace T-con
Y
Normal
Board or module
voltage
And Adjust VCOM
☞A28
N
Repair Power
Board or parts
End
1/14
LGE Internal Use Only