Date; Revised Date - LG 47LA790V Service Manual

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
Move to No
video/No audio
※Precaution ☞A4 & A7
Always check & record S/W Version and White
Balance value before replacing the Main Board
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
A. Video error
Error
No video/ Normal audio
☞A1
Y
Check Back Light
On with naked eye
N
Check Power Board 24v output
☞A5
☞A5
Y Check Power Board
On
12v,3.5v etc.
N
Replace Inverter
Y
Normal
or module
voltage
N
Repair Power
Board or parts
Replace Main Board
37 / 90
Established
2012. 12 .06

date

Revised date

Replace T-con Board
Y
Normal
or module
voltage
And Adjust VCOM
N
☞A28
Repair Power Board
or parts
End
Re-enter White Balance value
LGE Internal Use Only