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)
Replace
module
Check color condition by input
-External Input
-Display Port
-DVI-D
-HDMI
End
Vertical/Horizontal bar, residual image, light spot
Request repair
for external
device
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
☞
A6
External device screen error-Color error
External
Input
error
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Y
Replace
Main B/D
Screen
normal?
Check screen
condition by input
-External Input
-Diplay Port
-DVI-D
-HDMI/DVI
Request repair for
external device
Component
error
HDMI/
DVI-D
Diplay Port
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
Replace
Main B/D
Screen
normal?
N
Y
Check S/W Version
Y
N
Check
version
S/W Upgrade
Y
N
Normal
screen?
End
Y
N
Replace Main B/D
For LGD panel
Replace
Module
Screen
normal?
End
Established
date
Revised date
4/11
Standard Repair Process
☞
A4
☞
A5
Check Test pattern
4
For other panel
Error symptom
Copyright
ⓒ
2020 LG Electronics Inc. All rights reserved.
Only training and service purposes.
Summary of Contents for 75UH5F
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