LG 28LM4 0B-PU Series Service Manual page 28

Standard Repair Process
Error
symptom
Vertical/Horizontal bar, residual image, light spot
A6 A6
Check color condition by input
-External Input
-HDMI
A8
Check Test pattern
External device screen error-Color error
Check S/W Version Check S/W Version Check Check
version
Y
S/W Upgrade pg
Normal
screen?
Y
End
A. Video error
Vertical / Horizontal bar, residual image,
light s light spot, external device color error s pot, external d d evice color e
Check
Y
Screen
external
Normal?
normal? device
connection
condition
N N
Request repair
Replace
for external
module
device
Check screen
condition by input condition by input
N N
-External Input
-Component
-HDMI/DVI
N
Established
date
Revised date
e rror
A7
Check and
Y
Screen
replace Link
normal?
Cable
N
End
External External
Connect other external
Input
device and cable
error
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Component Component
Generator ,Set-top Box etc.
error
Connect other external
HDMI/
device and cable
DVI
(Check normal operation of (Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
- 28 -
N
Replace Main/T-con B/D
For BOE panel
Y Y
Replace Main B/D
For other panel
N
Screen
Replace
normal?
Main/T-con
B/D
Y
Request repair for
external device
Y
N
Replace
Screen
Main /T-con
normal?
B/D
2019
5/13
Replace
Module
N
Screen
normal?
Y
End
p