Read LG 42LM3400 / 42LM340S / 42LM340T (CHASSIS:LD21C) Service Manual online
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio
1
2
No video/No audio
2
3
Tuning fail, Picture broken/ Freezing
3, 4
4
Color error
5
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
6
6
B. Power error
No power
7
7
Off when on, off while viewing, power
auto on/off
auto on/off
8
8
C. Audio error
No audio/Normal video
9
9
Wrecked audio/discontinuation/noise
10
10
D. Function error
Remote control & Local switch checking
11
11
External device recognition error
12
12
E. Noise
Circuit noise, mechanical noise
13
13
F. Exterior error
Exterior defect
14
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
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