LG 32LF550B Service Manual page 43

Standard Repair Process
Error 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
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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
Version -Component
-RGB
Y
-HDMI/DVI
S/W Upgrade
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
External (Check normal operation of
External Input, Component
Input
error and HDMI by connecting
Jig, pattern Generator,
Set-top Box etc.
Compo
nent
error
Connect other external
device and cable
(Check normal operation of
HDMI
External Input, Component,
error
HDMI by connecting Jig,
pattern Generator ,Set-top
Box etc.
Established
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