LG 55G2 Service Manual page 90

Standard Repair Process
LCD TV
Vertical/Horizontal bar, residual image, light spot
☞A9
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
S/W Upgrade
Copyright ⓒ 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
A. Video error
Error
symptom
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
version
-RGB
-HDMI/DVI
Y
N
Normal
screen?
Y
End
Revised date
☞ A10
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,
HDMI/
RGB and HDMI/DVI by
DVI
connecting Jig, pattern
Generator ,Set-top Box etc.
38
Established
2012.01.16
date
N
Screen
Replace Main B/D
normal?
(adjust VCOM)
Y
End
Screen
normal?
Request repair for
external device
Screen
normal?
2012.03.21
Replace
Module
N
Screen
normal?
Y
End
N
Replace
Main B/D
Y
Y
N
Replace
Main B/D
LGE Internal Use Only