LG 50UL3G Service Manual page 19

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
☞A6
Check color condition by input
-External Input
-HDMI
☞A8
Check Test pattern
External device screen error-Color error
Check S/W Version
Check
version
Y
S/W Upgrade
Normal
screen?
Y
End
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check
Y
Screen external
normal?
device
connection
condition
N
Replace
module
Check screen
condition by
N
input
-External Input
-Component
-HDMI/DVI
N
Revised date
☞ A7
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
error
HDMI/DVI by connecting
Jig, pattern
Generator ,Set-top Box
etc.
Connect other external
HDMI/
device and cable
DVI
(Check normal operation
of External Input,
Component, RGB and
HDMI/DVI by connecting
Jig, pattern Generator ,Set-
top Box etc.
4
Established
date
For LGD panel
N
Screen
Replace Main/T-con
normal?
B/D
Y
Replace Main
End
B/D
For other panel
Screen
normal?
Y
Request repair for
external device
Y
Screen
normal?
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4/13
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main/T-con
B/D
N
Replace
Main /T-con
B/D