LG 47LA643V (CHASSIS:LD31B) Service Manual ▷ View online
A. Video error
Tuning fail, Picture broken/ Freezing
Y
N
☞ A5
Check RF Signal level
Normal
Signal?
Check
S/W Version
S/W Upgrade
SVC
Bulletin?
Normal
Picture?
Y
N
Y
Close
Check RF signal cable (DVB satellite signal or not)
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box, Different maker TV etc
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box, Different maker TV etc
Y
Change satellite setting
(match with installed ANT)
N
Normal
Picture?
Y
Close
N
☞ A6
Standard Repair Process
Established
date
Revised date
4/14
LCD TV
Error
symptom
Check satellite setting.
- Check LNB frequency.
- Check satellite
- Check Satellite connection
- Check LNB frequency.
- Check satellite
- Check Satellite connection
(DiSEqC, motor, etc…)
Normal
setting?
Contact with
signal distributor
or broadcaster
(Cable or Air)
Close
N
Check
Tuner soldering
Replace
Main B/D
2013. 01 .09
Color
error?
Y
N
※ Check and
replace Link
Cable
(LVDS) and
contact
condition
replace Link
Cable
(LVDS) and
contact
condition
Y
N
Replace Main B/D
Color
error?
Check error color
input mode
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
N
N
A. Video error
Color error
☞A7
N
Y
End
Replace module
Request repair
for external
device/cable
Color
error?
Check Test pattern
☞A10
☞ A8/ A9
Standard Repair Process
Established
date
Revised date
5/14
LCD TV
Error
symptom
2013. 01 .09
Screen
normal?
N
Y
Check external
device
connection
condition
device
connection
condition
Y
N
Check and
replace Link
Cable
replace Link
Cable
Normal?
Y
Screen
normal?
Replace
module
module
Check color condition by input
-External Input
-Component
-HDMI
-External Input
-Component
-HDMI
End
Vertical/Horizontal bar, residual image, light spot
Request repair
for external
device
for external
device
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
☞A10
External device screen error-Color error
External
Input
error
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top
Box etc.
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top
Box etc.
N
Y
Replace
Main B/D
Main B/D
Screen
normal?
Check screen
condition by input
-External Input
-Component
-HDMI/DVI
condition by input
-External Input
-Component
-HDMI/DVI
Request repair for
external device
external device
Component
error
HDMI
Connect other external
device and cable
device and cable
(Check normal operation of
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top Box
etc.
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top Box
etc.
Replace
Main B/D
Main B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Y
N
Replace Main B/D
Replace
Module
Module
Screen
normal?
End
Established
date
Revised date
6/14
LCD TV
Error
symptom
Standard Repair Process
☞A7
☞ A8/ A9
Check Test pattern
N
2013. 01 .09
B. Power error
No power
Power LED
On?
Y
N
DC Power on
by pressing Power Key
On Remote control
by pressing Power Key
On Remote control
Y
N
Normal
operation?
Check Power
On ‘”High”
On ‘”High”
Check Power cord
was inserted properly
was inserted properly
Check
Power LED
Power LED
Replace
Power
B/D
Power
B/D
Measure voltage of each output of Power B/D
N
Y
Normal
voltage?
Replace Main B/D
Y
OK?
Replace Main B/D
N
Y
Normal?
Check ST-BY 3.5V
Replace Power B/D
N
Y
Normal
voltage?
Replace Power
B/D
B/D
Y
☞A11
☞A12
☞A13
☞A4
Standard Repair Process
Established
date
Revised date
7/14
LCD TV
Error
symptom
. Stand-By: Red
※
Close
2013. 01 .09
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