LG 42LN5700 - Standard Repair Process

3/ 97
Normal
audio
Y
N
Move to No
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power Board
12V,3.5V etc.
Normal
voltage
Y
N
Replace T-con Board
or module
And Adjust VCOM
Repair Power Board
or parts
Check Power Board 24V output
Normal
voltage
Y
Replace Inverter
or module
N
Repair Power
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
Revised date
1/13
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4☞A1
☞A2
☞A28
☞A7 & A3
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, ETC…)
2012. 12 .21
Standard Repair Process
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