Vertical/Horizontal Bar, Residual Image, Light Spot; External Device Screen Error-Color Error - LG 42LB550A Service Manual

Standard Repair Process
Error
LCD TV
symptom

Vertical/Horizontal bar, residual image, light spot

A7
Check color condition by input
-AV
-Component
-HDMI
A10
Check Test pattern

External device screen error-Color error

Check S/W Version Check
version
S/W Upgrade
Normal
screen?
End
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
N
-AV
-Component
-HDMI
Y
N
Y
A8/ A9
Check and
Y
replace Link
Normal?
Cable
N
Request repair
for external
device
AV
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 .24
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