LG 70LA8600-SA (CHASSIS:LJ34D) Service Manual ▷ View online
Established
date
Standard Repair Process
Revised date
1/14
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
2012. 01 .14
☞
A4
☞
A1
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,,,)
Normal
audio
Y
N
Move to No
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power Board
12v,3.5v etc.
Normal
voltage
Y
N
Replace T-con Board
or module
R
i P
B
d
Ch k P
B
d 24
Move to No
video/No audio
Repair Power Board
or parts
Check Power Board 24v output
Normal
voltage
Y
Replace Inverter
or module
☞
A2
o tage
N
Repair Power
Board or parts
End
※Precaution
☞
A6 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
☞
A6 & A3
4 / 97
Standard Repair Process
A. Video error
No video/ No audio
Established
date
Revised date
2/14
LCD TV
Error
symptom
2012 . 01 .14
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
☞
A4
(
,
,
)
No audio
MAIN B/D
Replace Power
Board and repair
t
N
End
parts
5 / 97
A. Video error
Picture broken/ Freezing
Standard Repair Process
Established
date
Revised date
3/14
LCD TV
Error
symptom
2012. 01 .14
☞
A5
. By using Digital signal level meter
. By using Diagnostics menu on OSD
Check RF Signal level
y
g
g
( Menu→ Set up→ Support → Signal Test )
- Signal strength (Normal : over 50%)
- Signal Quality (Normal: over 50%)
Y
N
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`
A6
N
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Check
S/W Version
SVC
Bulletin?
Check
Tuner soldering
Y
Normal
Picture?
Y
Close
Normal
Picture?
Y
N
N
☞
A6
S/W Upgrade
Replace
Main B/D
Normal
Picture?
N
Contact with signal distributor
or broadcaster (Cable or Air)
Normal
Picture?
Y
N
Y
Close
Close
6 / 97
A. Video error
Tuning fail, Picture broken/ Freezing
Standard Repair Process
Established
date
Revised date
4/14
LCD TV
Error
symptom
2012. 01 .14
☞
A5
Check RF Signal level
Check RF signal cable
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box Different maker TV etc
Y
N
Normal
Si
l?
Check
S/W V
i
SVC
B ll i ?
→ Set Top Box, Different maker TV etc
☞
A6
Check
T
ld i
Replace
M i B/D
Signal?
S/W Version
S/W Upgrade
Bulletin?
Y
N
Tuner soldering
Main B/D
Normal
Picture?
N
Y
Contact with
signal distributor
or broadcaster
(Cable or Air)
Close
Close
7 / 97
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