LG 37LV370S-ZB / 37LV375G-ZC / 37LV375S-ZC / 37LV375W-ZC (CHASSIS:LD12B) Service Manual ▷ View online
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
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
A. Video error
No video/No audio
2/13
☞148
Error
symptom
symptom
Normal
signal?
Y
N
Case 1)
Case 2)
Check S/W
Version
Version
Y
N
Version
exists?
Check and fix
cable
signal/connector
cable
signal/connector
※ 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/antenna
provider)
ANT signal
(Request to
cable/antenna
provider)
End
☞150
Established
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
A. Video error
Video error, video lag/stop
3/13
Error
symptom
symptom
Color
error?
Y
N
※ Check
and replace
Link Cable
(LVDS) and
contact
condition
and replace
Link Cable
(LVDS) and
contact
condition
Y
N
Replace Main B/D
Color
error?
Check error
color input
mode
color input
mode
Check color by input
-External Input
-COMPONENT
-External Input
-COMPONENT
-
RGB
-
HDMI/DVI
Y
External device
/Cable
normal
External Input/
Component
error
Check
external
device and
cable
external
device and
cable
Main B/D
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
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
A. Video error
Color error
4/13
☞154
☞152
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
Screen
normal?
N
Y
Check external
device
connection
condition
device
connection
condition
Y
N
Check and
replace Link
Cable
replace Link
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
Replace
module
module
Check color condition by input
-External Input
-Component
-External Input
-Component
-
RGB
-
HDMI/DVI
Check Test mode
RGB screen
RGB screen
End
Vertical/Horizontal bar, residual image, light spot
Request
repair for
external
device
repair for
external
device
Established
date
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 2 . 1
LCD TV
A. Video error
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5/13
☞154
Error
symptom
symptom
Use Picture Test
Color
error?
N
N
Replace Main B/D
Color
error?
Y
End
Y
Replace
module
module
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