Video Error; No Video/ Normal Audio - LG 49LF6400-DA Service Manual

Standard Repair Process
Error
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔Power B/D, LVDS/EPI Cable,Speaker Cable,IR/Wi-Fi combo cable↔Main B/D,,,)
No video
Normal
Normal audio
audio
N
Move to
No video/No audio
※Precaution ☞A4
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

No video/ Normal audio

Y
Check Back Light
On with naked eye
☞A5
Check Power Board DRV_ON output
Repair Power
Board or parts
☞A5
Y Check Power Board
On
D13V
N
Replace Inverter
Normal Y
or module
voltage
N
Replace Main Board
Established
date
Revised date
Replace T-con Board
Y
Normal
or module
voltage
N
Repair Power Board
or parts
End
Re-enter White Balance value
1/13
LGE Internal Use Only