LG 86UH9500 Service Manual page 106

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
☞A8
Check Test pattern
External device screen error-Color error
Check S/W Version Check
version
S/W Upgrade
Normal
screen?
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Only for training and service purposes
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check the
N
Screen
lock Signal of
normal?
Vx1 or EPI
Y
Replace
Main B/D
Check screen
condition by
N
input
-External Input
-Component
-HDMI/DVI
Y
N
Y
End
☞ A7
Check and
N
Normal? replace Link
Cable
Y
Replace module or
T-con B/D(Vx1)
External
Connect other external
Input
device and cable
error
(Check normal operation of
External Input, Component,
Component
RGB and HDMI/DVI by
error
connecting Jig, pattern
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.
- HDMI ULTRA HD Deep
Color menu off
※ All Settings  General  HDMI ULTRA HD Deep Color  On/Off
5
Established
date
Revised date
N
Screen
Replace Main/T-con B/D
normal?
(adjust VCOM, If need)
Y
End
Screen
normal?
Request repair for
external device
Screen
normal?
5/15
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main/T-con
B/D
Y
Y
N
Replace
Main /T-con
B/D
LGE Internal Use Only