LG 86UH5C Service Manual page 26

Standard Repair Process
Error symptom
Vertical/Horizontal bar, residual image, light spot
☞A4
Check color condition by input
-External Input
-Display Port
-DVI-D
-HDMI
☞A6
Check Test pattern
External device screen error-Color error
Check S/W Version
Check
version
S/W Upgrade
Normal
screen?
End
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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 external
Y
Screen device
normal? connection
condition
N
Replace
module
Check screen
condition by input
N
-External Input
-Diplay Port
-DVI-D
-HDMI/DVI
Y
N
Y
☞ A5
Check and
Y
Normal? replace Link
Cable
N
Request repair
for external
device
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
HDMI/
(Check normal operation of
DVI-D
External Input, Component,
Diplay Port RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
4
Established
date
Revised date
N
Screen
Replace Main B/D
normal? (adjust VCOM)
For LGD panel
Y
Replace Main B/D
End
For other panel
Screen
normal?
Request repair for
external device
Screen
normal?
4/11
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main B/D
Y
Y
N
Replace
Main B/D
LGE Internal Use Only