Read LG 42LM3400 / 42LM340S / 42LM340T (CHASSIS:LD21C) Service Manual online
Normal
audio
Y
N
Move to No
video/No audio
video/No audio
No video
Normal audio
Normal audio
Check Back Light
On with naked eye
On with naked eye
On
Y
N
Check Power
Board
12v,3.5v etc.
Board
12v,3.5v etc.
Normal
voltage
Y
N
Replace T-con
Board or module
Board or module
Repair Power
Board or parts
Board or parts
Check Power Board 24v output
Normal
voltage
voltage
Y
Replace Inverter
or module
or module
N
Repair Power
Board or parts
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
Standard Repair Process
Revised date
1/14
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4
☞A1
☞A2
☞A6 & A3
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,,,)
2012. 01 .14
Click on the first or last page to see other 42LM3400 / 42LM340S / 42LM340T (CHASSIS:LD21C) service manuals if exist.