LG 32LB520B Service Manual page 30

Standard Repair Process
Error
LED 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
Move to
No video/No
audio
☞A6 & A3
※Precaution
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
☞A1
Y
Check Back Light
On with naked eye
N
☞A2
Check Backlight driver voltage and +24V input to driver board
Repair power
board or driver board
☞A4
Y
Check power board
and main board
On
voltage: LVDS, PANEL_12V
N
Y
Normal Replace Inverter
Voltage or module
N
Replace Main Board
Established
2014.07.07
date
Revised date
Y
Replace T-con
Normal
Board or module
Voltage
N
Repair LVDS power
ciucuit or change
main chip
End
Re-enter White Balance value
1/14
LGE Internal Use Only