LG 55EA9800-SA (CHASSIS:EJ34D) Service Manual ▷ View online
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
No video/Normal audio
1
2
No video/No audio
2
A. Video error
3
Picture broken/ Freezing
3
4
Color error
4
Vertical/Horizontal bar residual image
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
Off
h
ff
hil
i
i
B. Power error
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
Remote control & Local switch checking
10
MR13
i
h
ki
11
D. Function error
MR13 operating checking
11
11
12
Wifi operating checking
12
13
Camera operating checking
13
13
Camera operating checking
13
14
External device recognition error
14
15
E. Noise
Circuit noise, mechanical noise
15
16
F. Exterior error
Exterior defect
16
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Established
date
Standard Repair Process
Revised date
1/16
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
2013.01.31
Revised date
1/16
No video/ Normal audio
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, EPI Cable,Speaker Cable,IR B/D Cable,,,)
Normal
audio
Y
No video
Normal audio
Normal audio
Check
OLED
Light
On with naked eye
On
Y
Check Power
Board
Board
24V
, 12V,3.5V etc.
Normal
voltage
Y
Replace T-con
Board or module
And Adjust VCOM
Board or module
And Adjust VCOM
☞
A18
☞
A1
N
Move to No
video/No audio
video/No audio
N
N
Repair Power
Board or parts
Board or parts
Check Power Board
24V
output
☞
A18
Normal
voltage
voltage
Y
Replace Inverter
or module
or module
N
End
Repair Power
Board or parts
Board or parts
Always check & record S/W Version and White
※
Precaution
☞
A4 & A2
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
1
Standard Repair Process
A. Video error
No video/ No audio
Established
date
Revised date
2/16
LCD TV
Error
symptom
2013.01.31
No video/ No audio
Revised date
2/16
Check various
Check and
Y
☞
A18
Normal
voltage?
Check various
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
No Video/
No audio
No audio
Check and
replace
MAIN B/D
replace
MAIN B/D
Y
N
End
Replace Power
Board and repair
parts
Board and repair
parts
2
A. Video error
Picture broken/ Freezing
Standard Repair Process
Established
date
Revised date
3/16
LCD TV
Error
symptom
2013.01.31
Picture broken/ Freezing
A3
By using Digital signal level meter
Revised date
3/16
☞
A3
Check RF Signal level
. By using Digital signal level meter
. By using Diagnostics menu on OSD
. By using Diagnostics menu on OSD
( Setting
→ Set up→ Manual Tuning → Check the Signal )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
- Signal Quality (Normal: over 50%)
Y
Normal
Signal?
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
N
N
Check RF Cable
Connection
Check
DVD Player ,Set Top Box, Different maker TV etc
SVC
Check
T
ld i
Y
Close
Normal
Y
☞
A4
1. Reconnection
2. Install Booster
S/W Version
S/W Upgrade
Bulletin?
Tuner soldering
Y
Close
Picture?
Contact with signal distributor
N
Normal
N
N
Replace
Main B/D
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
Normal
Picture?
Y
Y
Close
Close
3
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