LG 28LM4 0B-PU Series Service Manual page 33

Standard Repair Process
Error
symptom
1. Remote control(R/C) operating error
Check R/C itself Check R R /C itself
Normal Normal Y Y
operating?
Operation
N
Check R/C Operating Check & Replace
When turn off light Baterry of R/C
in room
If R/C operate,
Normal
operating?
Explain the customer
cause i cause is interference i s interference
from light in room.
Replace R/C
D. Function error
Remote control & Local switch checking
A21
Check & Repair
Normal Normal
Cable connection
operating?
Connector solder
Y
Close
Y
Close
N
- 33 -
Established
date
Revised date
A21
N
Check B Check B+5V B +5V Normal Normal
Voltage?
On Main B/D
N
A18
Check 5V on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don't have problem)
10/13
Replace
Main B/D
A21
Y
Check IR Check I I R Normal Normal
Signal?
Output signal
N
Repair/Replace
IR B IR B/D B /D
2019
Y