LG 75SM9900PTA Service Manual page 27

Chassis ub91l
Table of Contents

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Contents of Standard Repair Process
No.
Error symptom (High category)
1
2
3
A. Video error
4
5
6
7
B. Power error
8
9
C. Audio error
10
11
12
D. Function error
13
14
15
E. Noise
16
F. Exterior error
First of all, Check whether there is SVC Bulletin in GSCS System for these model.
Error symptom (Mid category)
No video/Normal audio
No video/No audio
Picture broken/ Freezing
Color error
Vertical/Horizontal bar, residual image, light spot,
external device color error
No power
Off when on, off while viewing, power auto on/off
Off when on, off while viewing, power auto on/off
No audio/Normal video
Wrecked audio/discontinuation/noise
Remote control & Local switch checking
Magic Remote control operating checking
WiFi operating checking
External device recognition error
Circuit noise, mechanical noise
Exterior defect
Page
Remarks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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Only for training and service purposes

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