Vertical/Horizontal Bar, Residual Image, Light Spot; External Device Screen Error-Color Error - LG 42LM660S Service Manual

Standard Repair Process
Error
LCD TV
symptom

Vertical/Horizontal bar, residual image, light spot

☞A8
Check color condition by input
-External Input
-Component
-RGB
-HDMI/DVI
☞A12
Check Test pattern

External device screen error-Color error

Check S/W Version Check
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
Screen device
normal? connection
condition
N
Replace
module
Check screen
condition by input
-External Input
N
-Component
-RGB
-HDMI/DVI
Y
N
Y
☞ A10/ A11
Check and
Y
Normal? replace Link
Cable
N
Request repair
for external
device
External
Connect other external
Input
device and cable
error
(Check normal operation of
External Input, Component,
Component
RGB and HDMI/DVI by
error
connecting Jig, pattern
Generator ,Set-top Box etc.
RGB
Connect other external
error
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
HDMI/
connecting Jig, pattern
DVI
Generator ,Set-top Box etc.
Established
2010. 12 .14
date
Revised date
☞ A28
N
Screen
Replace Main B/D
normal?
(adjust VCOM)
For LGD panel
Y
Replace Main B/D
End
For other panel
Screen
normal?
Request repair for
external device
Screen
normal?
5/13
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main B/D
Y
Y
N
Replace
Main B/D
LGE Internal Use Only