LG 43UH67 Series Service Manual page 37

Standard Repair Process
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, VX1 Cable, Speaker Cable, IR B/D Cable,,,)
No video
Normal
Normal audio
audio
N
Move to No
video/No audio
※Precaution ☞A4 & A2
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
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
Panel Vcc (12V) output (IC1100)
☞A18
☞A18
Y Check Power
On
Board +13V
N
Replace Inverter
Y
Normal
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
1
Established
date
Revised date
Replace T-con/Main
Y
Normal
Board or module
voltage
And Adjust VCOM
N
Repair Power
Board or parts
End
Re-enter White Balance value
1/16
LGE Internal Use Only