LG 49UB8500-UA Service Manual page 89

Standard Repair Process
LCD TV
symptom
Vertical/Horizontal bar, residual image, light spot
☞A6
Check color condition by input
-External Input
-Component
-HDMI HDMI
A8
☞A8
Check Test pattern
External device screen error-Color error
Check S/W Version
version
S/W Upgrade
Normal
screen?
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Error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check external
Y
Screen device
normal? connection
condition
N
Replace
module
Check screen
condition by input
-External Input
N
Check
-Component
-HDMI/DVI
Y
N
Y
End
A. Video error
☞ A7
Check and
Y
Normal? replace Link
Cable Cable
N
Request repair
for external
device
External
Input
error
Component
error
HDMI/
DVI
5
Established
2013.01.31
date
Revised date Revised date
N
Screen
Replace Main/T-con B/D
normal?
(adjust VCOM) (adjust VCOM)
For LGD panel
Y
Replace Main B/D
End
For other panel
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.
Connect other external
device and cable
(Check normal operation of
E t External Input, Component, l I t C t
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
5/16 5/16
Replace
Module Module
N
Screen
normal?
Y
End
N
Screen
Replace Replace
normal?
Main/T-con
B/D
Y
Request repair for
external device
Y
N
Replace
Screen
Main /T-con Main /T-con
normal? normal?
B/D
LGE Internal Use Only