LG 42LV3710-TB / 42LV371Y-TB / 42LV3730-TD (CHASSIS:LB12B) Service Manual ▷ View online
Normal
audio
Y
N
Move to No
video/No audio
video/No audio
No video
Normal audio
Normal audio
Check Back Light
On with naked eye
On with naked eye
On
Y
N
Check Power
Board
12v,5v etc.
Board
12v,5v etc.
Normal
voltage
Y
N
Replace Main Board
Replace T-con
Board or module
Board or module
OR
Repair Power
Board or parts
Board or parts
Check Power Board 24v output
Normal
voltage
voltage
N
Repair Power
Board or parts
Board or parts
End
Always check/record S/W Version and White
Balance value before replacing the Main
/Digital Board
Balance value before replacing the Main
/Digital Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
date
Standard Repair Process
Revised date
P-1
LCD TV
Error
symptom
symptom
A. Video error
No video/Normal audio
☞A-1-3
☞A-1-1
☞A-1-2
☞A-1-4
Normal
voltage?
Check various
voltages of Power
Board
( 5V,12V,24V…)
voltages of Power
Board
( 5V,12V,24V…)
No Video/
No audio
No audio
Check and
replace
MAIN B/D
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
Board and repair
parts
N
End
Established
date
Standard Repair Process
Revised date
LCD TV
A. Video error
No video/No audio
☞A-1-5
Error
symptom
symptom
P-2
Normal
signal?
Y
N
Case 1)
Case 2)
Check S/W
Version
Version
Y
N
Version
exists?
Check and fix
cable
signal/connect
or
cable
signal/connect
or
※ Check antenna
signal
- Check Signal
Strength and Quality
signal
- Check Signal
Strength and Quality
S/W Upgrade
※ Digital signal
measuring device or
digital ANT
※ Check expert mode
with user remote
controller
measuring device or
digital ANT
※ Check expert mode
with user remote
controller
* Check point
1) Digital signal disconnected?
2) Analog video signal weak?
2) Analog video signal weak?
Y
N
Normal
screen?
End
Replace Main
B/D
B/D
Connect external device RF signal
N
Y
Normal
screen?
Check and
fix ANT
signal
(Request to
cable/antenn
a provider)
fix ANT
signal
(Request to
cable/antenn
a provider)
End
☞A-2-2
Established
date
Standard Repair Process
Revised date
LCD TV
A. Video error
Video error, video lag/stop
Error
symptom
symptom
P-3
☞A-2-1
Color
error?
Y
N
※ Check
and replace
Link Cable
(LVDS) and
contact
condition
and replace
Link Cable
(LVDS) and
contact
condition
Y
N
Color
error?
Check error
color input
mode
color input
mode
Check color by input
-External Input
-COMPONENT
-RGB
-HDMI/DVI
-External Input
-COMPONENT
-RGB
-HDMI/DVI
Y
External
Device /Cable
normal
External Input/
Component
error
Check
external
device and
cable
external
device and
cable
Y
External
Device /Cable
normal
RGB/
HDMI/DVI
error
Check external
device and
cable
device and
cable
Replace Main B/D
Replace Main B/D
Use Picture Test
N
N
Established
date
date
Standard Repair Process
Revised date
LCD TV
A. Video error
Color error
☞A-4-1
☞A-3-1
N
Y
Color
error?
End
Replace module
Error
symptom
symptom
Request repair
for external
device/cable
for external
device/cable
Color
error?
N
Y
Replace Main B/D
Color
error?
Y
End
P-4
Replace Main B/D
Replace Main B/D
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