Vertical/Horizontal Bar, Residual Image, Light Spot; External Device Color Error - LG 42LB55 series Service Manual

Standard Repair Process
Error
LCD TV
symptom

Vertical/Horizontal bar, residual image, light spot

☞A7
Check color condition by input
-External Input
-Component/AV
-HDMI
☞A10
Check Test pattern
External device screen error-Color error
Check S/W Version
S/W Upgrade
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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
Screen device
normal connection
condition
N
Replace
module
Check screen
condition by input
Check N -External Input
-Component
Version
-RGB
Y
-HDMI/DVI
N
Normal
Screen
Y
End
☞ A8/ A9
Check and
Y
Screen
replace Link
normal
Cable
N
Request repair
for external
device
Connect other external
device and cable
(Check normal operation of
External
Input External Input, Component
and HDMI by connecting
error
Jig, pattern Generator,
Set-top Box etc.
Compo
nent
error
Connect other external
device and cable
(Check normal operation
of External Input,
HDMI
error Component, HDMI by
connecting Jig, pattern
Generator ,Set-top Box
etc.
Established
2012. 01 .14
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