LG 32SE3B-BE Service Manual page 39

Standard Repair Process
Error
Signage Monitor
symptom
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, Power Cable, FFC LVDS Cable, Key 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
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
☞A2
Check Power Board LED B+ Voltage
(LED B+ voltage depends on Power BD Spec)
☞A4
Y Check Power Board
On
13.2 V (Pin No. 7/8)
N
Replace Inverter
Normal Y
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
10
Established
2014.06.10
date
Revised date
Replace T-con Board
Y
Normal
or module
voltage
And Adjust VCOM
N
Repair Power Board
or parts
End
Re-enter White Balance value
1/13
LGE Internal Use Only