LG 50UH5500 Service Manual page 88

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 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 external
Y
Screen device connect
normal? ion condition
N
Request repair
Replace
for external de
module
vice
Check screen co
ndition by input
-External Input
N
-Component
-HDMI
N
Established
Revised date
☞ A7
Check and rep
Y
Normal? lace Link Cabl
normal?
e
N
External
Connect other external d
Input
evice and cable
error
(Check normal operation of
External Input, Component,
Component
and HDMI by connecting Ji
error
g, pattern Generator ,Set-t
op Box etc.
Connect other external d
HDMI/
evice and cable
DVI
(Check normal operation of
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top B
ox etc.
5
date
N
Screen
Replace Main/T-con B/D
(adjust VCOM)
For LGD panel
Y
Replace Main B/D
End
For other panel
N
Screen
normal?
Y
Request repair for ext
ernal device
Y
Screen
normal?
5/16
Replace
Module
N
Screen
normal?
Y
End
Replace Ma
in/T-con B/
D
N
Replace
Main /T-con
B/D