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LG 75UN8100PTB Service Manual page 35

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Standard Repair Process
Error
symptom
Check R/C itself
Normal
operating?
Operation
N
Check R/C Operating
Check & Replace
When turn off light
Baterry of R/C
in room
If R/C operate,
Explain the customer
cause is interference
from light in room.
D. Function error
Remote control & Local switch checking
☞A22
Check & Repair
Y
Cable connection
Connector solder
Y
Normal
End
operating?
N
Replace R/C
☞A22
N
Normal
Check B+3.5V
operating?
On Main B/D
Y
☞A18
Check 13.2V from Power B/D
End
11
Established
date
Revised date
☞A22
Y
Normal
Check IR
Voltage?
input signal
N
Replace Power B/D
Copyright © 2020 LG Electronics. Inc. All rights reserved.
Only for training and service purposes.
Replace
Main B/D
Y
Normal
Signal?
N
Repair/Replace
IR B/D

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