A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Established
date
Revised date
5/13
LCD TV
Error
symptom
Standard Repair Process
2013. 11 .30
2014. 02 .04
Vertical/Horizontal bar, residual image, light spot
light spot, external device color error
Replace
Module
☞
A8
Screen
normal?
N
Y
Check external
device
connection
condition
Y
N
Check and
replace Link
Cable
Normal?
Y
N
Screen
normal?
Replace Main B/D
(adjust VCOM)
Check color condition by input
-External Input
-Component
-HDMI/DVI
Y
N
For LGD panel
Screen
normal?
A8
☞
A28
N
Y
Replace
module
End
Request repair
for external
device
☞
A12
Replace Main B/D
End
Check Test pattern
For other panel
External device screen error-Color error
External
Connect other external
Check screen
condition by input
Check S/W Version
N
Check
Input
error
device and cable
(Check normal operation of
External Input, Component
and HDMI/DVI by connecting
Jig, pattern Generator ,Set-
top Box etc.
N
Y
Replace
Main B/D
Screen
normal?
y
-External Input
-Component
-HDMI/DVI
Component
error
Check S/W Version
Y
N
Check
version
S/W Upgrade
Request repair for
external device
HDMI/
Connect other external
device and cable
(Check normal operation of
External Input, Component
Replace
Screen
N
Y
Y
N
Normal
screen?
DVI
p ,
p
and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
p
Main B/D
normal?
Y
End
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Summary of Contents for 42LB700T
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