LG 49UB850T - Picture Broken; Freezing

Established
date
Standard Repair Process
Revised date
1/16
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
2013.01.31
Revised
date
1/16
No
video/
Normal
audio
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,,,)
Normal
audio
Y
No video
Normal audio
Check Back Light
On with naked eye
On
Y
Check Power
Board
24V, 12V,3.5V etc.
Normal
voltage
Y
Replace T-con/Main
Board or module
And Adjust VCOM
☞A18☞A1
N
Move to No
video/No audio
N
N
Repair Power
Board or parts
Check Power Board 24V output
☞A18
Normal
voltage
Y
Replace Inverter
or module
N
End
Repair Power
Board or parts
Always check & record S/W Version and White
※Precaution
☞A4 & A2
Always
check
&
record
S/W
Version
and
White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
1
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