LG 65LA970V-ZA / 65LA970W-ZA / 65LA9709-ZA (CHASSIS:LD34N) Service Manual ▷ View 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
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
MR13 operating checking
11
11
12
Wifi operating checking
12
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.
Normal
audio
Y
N
Move to No
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power
Board
24V, 12V,3.5V etc.
Normal
voltage
Y
N
Replace T-con/FRC
Board or module
And Adjust VCOM
Repair Power
Board or parts
Check Power Board 24V output
Normal
voltage
Y
Replace Inverter
or module
N
Repair Power
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※
Precaution
Established
date
Standard Repair Process
Revised date
1/16
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A18
☞A1
☞A18
☞A4 & A2
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
2013.01.31
Normal
voltage?
Check various
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
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
☞A18
Established
date
Revised date
2/16
LCD TV
Error
symptom
2
2013.01.31
A. Video error
Picture broken/ Freezing
Y
N
☞ A3
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
☞ A4
Standard Repair Process
Established
date
Revised date
3/16
LCD TV
Error
symptom
3
N
2013.01.31
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