LG 55UJ634 Series Service Manual page 40

Standard Repair Process
Error
symptom
☞A6
Check color by input
-External Input
-COMPONENT
-AV
-HDMI
☞A8
Check Test pattern
A. Video error
Color error
☞ A7
※ Check and
replace Link
Y
Cable
Color
error? (V by one or EPI)
and contact
N
condition
Check error
color input
mode
External Input/
Component
error
HDMI
error
Revised date
Y
Color
Replace Main B/D
error?
N
Check external
External
device and
device/Cable
cable normal
Request repair
for external
device/cable
Check external External
device and device/Cable
cable
normal
4
Established
date
Y
Color
Replace module
error?
N
End
Y
Replace Main/T-con B/D
N
N
Y
Replace Main/T-con B/D