LG 50LN54 Series Service Manual page 45

Standard Repair Process
Error
LCD TV
symptom
Vertical/Horizontal bar, residual image, light spot
☞A7
Check color condition by input
-External Input
-Component
-HDMI
☞A10
Check Test pattern
External device screen error-Color error
Check
Check S/W Version
version
S/W Upgrade
Normal
screen?
End
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Only for training and service purposes
A. Video error
Vertical / Horizontal bar, residual image,
light spot, external device color error
Check external
Y
device
Screen
connection
normal?
condition
N
Replace
module
Check screen
condition by input
N
-External Input
-Component
-HDMI/DVI
Y
N
Y
☞ A8/ A9
Check and
Y
replace Link
Normal?
Cable
N
Request repair
for external
device
External Connect other external
Input device and cable
error
(Check normal operation of
External Input, Component,
and HDMI by connecting Jig,
Component
pattern Generator ,Set-top
error
Box etc.
Connect other external
device and cable
(Check normal operation of
HDMI
External Input, Component,
and HDMI by connecting Jig,
pattern Generator ,Set-top Box
etc.
Established
2013. 01 .09
date
Revised date
N
Screen
Replace Main B/D
normal?
Y
End
Screen
normal?
Request repair for
external device
Screen
normal?
6/14
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main B/D
Y
Y
N
Replace
Main B/D
LGE Internal Use Only