LG 55SK9000PUA Service Manual page 35

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
☞A6
Check color condition by input
-External Input
-HDMI
☞A15
Check Test pattern
External device screen error-Color error
Check S/W Version
Check
version
S/W Upgrade
Normal
screen?
End
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check external
Y
device
Screen
connection
normal?
condition
N
Replace
module
Check screen
condition by input
-External Input
N
-AV
-HDMI/DVI
Y
N
Y
☞ A7
Check and
Y
replace Link
Normal?
Cable
N
Request repair
for external
device
Connect other external
device and cable
External
(Check normal operation of
Input
External Input, HDMI/DVI
error
by connecting Jig, pattern
Generator ,Set-top Box etc.
HDMI/
DVI
5
Established
date
Revised date
N
Screen
Replace Main B'D
normal?
for LGD Panel
Y
Replace Main B'D
End
Screen
normal?
Request repair for
external device
Connect other external
device and cable
Screen
(Check normal operation of
External Input, Component, normal?
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
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5/16
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main B/D /
Module
Y
Y
N
Replace
Main B/D /
Module