LG 55EM970V-ZA (CHASSIS:ED23E) Service Manual ▷ View online
Contents of OLED 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
Picture broken/ Freezing
3
4
Color error
4
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5
6
B. Power error
No power
6
7
Off when on, off while viewing, power
auto on/off
auto on/off
7
8
C. Audio error
No audio/Normal video
8
9
Wrecked audio/discontinuation/noise
9
10
D. Function error
Remote control & Local switch checking
10
M4 operating checking
11
11
12
Wifi operating checking
12
13
External device recognition error
13
14
E. Noise
Circuit noise, mechanical noise
14
15
F. Exterior error
Exterior defect
15
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Normal
audio
Y
N
No video
Normal audio
Replace
Optical Cable
Check
Video
N
Always check & record S/W Version before
replacing the Main Board
Replace Main Board
※
Precaution
Established
date
Standard Repair Process
Revised date
1/15
OLED TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4
☞A1
☞A7 & 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,,,)
1
Always check & record White Balance value
before replacing the FRC Board
Replace FRC Board
Re-enter White Balance value
Move to No
video/No audio
End
Y
Check Power
Board
20V, 12V,3.5V etc.
Normal
voltage
Y
N
Replace T-con
Board or module
Repair Power
Board or parts
Check Various
voltage on a main
board.
Normal
voltage
Repair Main board
Y
Replace FRC board
N
2013. 01 .26
Normal
voltage?
Check various voltages
of Power Board
( 3.5V,12V or 20V…)
No Video/
No audio
Check and
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date
2/15
OLED TV
Error
symptom
2
Replace
Optical Cable
Check
Video
Y
End
N
2013. 01 .26
A. Video error
Picture broken/ Freezing
Y
N
☞ A6
N
Check RF Signal level
Normal
Signal?
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Check
S/W Version
S/W Upgrade
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
SVC
Bulletin?
Replace
Main B/D
Check
Tuner soldering
Normal
Picture?
Y
N
Y
Close
Y
Close
. By using Digital signal level meter
. By using Diagnostics menu on OSD
( Setting→ Set up→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Normal
Picture?
Y
Contact with signal distributor
or broadcaster (Cable or Air)
N
Normal
Picture?
Y
Close
N
☞ A7
Standard Repair Process
Established
date
Revised date
3/15
OLED TV
Error
symptom
3
N
2013. 01 .26
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