LG 55UJ634 Series Service Manual page 41

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
☞A6
Check color condition by input
-External Input
-Component
-HDMI
☞A8
Check Test pattern
External device screen error-Color error
Check
Check S/W Version
version
S/W Upgrade
Normal
screen?
End
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check external
Y
device
Screen
normal? connection
condition
N
Replace
module
Check screen
condition by input
N
-External Input
-Component
-HDMI
Y
N
Y
☞ A7
Check and
Y
replace Link
Normal?
Cable
N
Request repair
for external
device
Connect other external
External
Input device and cable
error
(Check normal operation of
External Input, Component,
and HDMI by connecting
Component
Jig, pattern Generator ,Set-
error
top Box etc.
Connect other external
device and cable
(Check normal operation of
HDMI/
External Input, Component,
DVI
and HDMI by connecting Jig,
pattern Generator ,Set-top
Box etc.
5
Established
date
Revised date
N
Screen
Replace Main/T-con B/D
normal?
For 65" 60"
Y
Replace Main B/D
End
For 55" 49" 43"
Screen
normal?
Request repair for
external device
Y
Screen
normal?
Replace
Module
N
Screen
normal?
Y
End
N
Replace Main/
T-con B/D
Y
N
Replace Main/
T-con B/D