LG 37LV470S Service Manual page 47

Standard Repair Process
LCD TV
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
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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
N
Check
-External Input
version
-Component
-RGB
-HDMI/DVI
Y
S/W Upgrade
N
Normal
screen?
Y
End
Established
Revised date
☞ A10/ A11
Check and
Y
Normal? replace Link
Cable
N
Request repair
for external
device
Connect other external
External
device and cable
Input
(Check normal operation of
error
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Component
Generator ,Set-top Box etc.
error
RGB
Connect other external
error
device and cable
(Check normal operation of
External Input, Component,
HDMI/
RGB and HDMI/DVI by
connecting Jig, pattern
DVI
Generator ,Set-top Box etc.
6
2010. 12 .14
date
☞ A28
N
Screen Replace Main B/D
normal? (adjust VCOM)
For LGD panel
Y
Replace Main
End B/D
For other panel
N
Screen
normal?
Y
Request repair for
external device
Y
N
Screen
normal?
6/14
Replace
Module
N
Screen
normal?
Y
End
Replace
Main B/D
Replace
Main B/D
LGE Internal Use Only