LG 55X6500-TD Service Manual page 71

Standard Repair Process
LCD TV
symptom
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
N
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
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
☞A2
Check Power Board 20V /12V or 24v output
☞A4
Y
Check Power
On
Board
12v,5v etc.
N
Replace Inverter
Y
Normal
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
1
Established
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
1/13
LGE Internal Use Only