LG 50UL3G, Service Manual

Page: 19 / 54

Screen
normal?
N
Y
Check
external
device
connection
condition
Y
N
Check and
replace Link
Cable
Normal?
Y
N
Screen
normal?
Replace Main/T-con
B/D
Replace
module
Check color condition by input
-External Input
- 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
☞
A8
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/T-con
B/D
Screen
normal?
Check screen
condition by
input
-External Input
-Component
- HDMI/DVI
Request repair for
external device
Component
error
HDMI/
DVI
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 /T-con
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
4/13
Error
symptom
Standard Repair Process
☞
A6
☞
A7
Check Test pattern
4
For other panel
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2020 LG Electronics Inc. All rights reserved.
Only training and service purposes.