LG 50UH5500 Service Manual page 93

Standard Repair Process
Error
symptom
1. Remote control(R/C) operating error
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,
Normal
Explain the customer operating?
cause is interference
from light in room.
Replace R/C
D. Function error
Remote control & Local switch checking
☞A22
Check & Repair
Y Normal
Cable connection
operating?
Connector solder
Close
Y
Close
N
Established
Revised date
☞A22
Check B+ 3.5
N
Normal
V
Voltage?
On Main B/D
Y
☞A18
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don't have problem)
10
date
☞A22
Y
Check IR Normal
Signal?
Output signal
N
Repair/Replace
10/16
Replace
Main B/D
Y
N
IR B/D