LG OLED77ZXPTA Service Manual page 25

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
☞A6
Check color condition by input
-External Input
-HDMI
☞A19
Check Test pattern
External device screen error-Color error
Check
Check S/W Version
version
S/W Upgrade
Normal
screen?
End
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check
external
Y
Screen
device
normal?
connection
condition
N
Replace
module
Check screen
condition by input
N
-External Input
-Component
-HDMI/DVI
Y
N
Y
☞ A7
Check and
Y
replace Link
Normal?
Cable(Vx1)
N
Request repair
for external
device
Connect other external
External
device and cable
Input
error (Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
Component
connecting Jig, pattern
error
Generator ,Set-top Box etc.
Connect other external
device and cable
(Check normal operation of
HDMI/
External Input, Component,
DVI
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
5
Established
date
Revised date
N
Screen
Replace Main B/D
normal?
Y
End
Screen
normal?
Y
Request repair for
external device
Y
Screen
normal?
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5/18
Replace
Module
N
Screen
normal?
Y
End
N
Replace Main
B/D, Module
N
Replace Main
B/D, Module