Read LG 42SL80YD-AA (CHASSIS:LB91T) Service Manual online
D. General Function Problem
Remote control & Local switch checking
Standard Repair Process
Established
date
Revised date
2008. 3 .26
10/13
LCD TV
Error
symptom
Y
1. Remote control(R/C) operating error
Check R/C itself
Normal
Check & Repair
Normal
Check B+ 5V
☞
A27
Normal
N
Check IR
Normal
Y
☞
A27
Replace
Main B/D
Y
☞
A27
Y
N
Check R/C itself
Operation
Normal
operating?
Y
Check R/C Operating
Check & Replace
Cable connection
Connector solder
Normal
operating?
Check B+ 5V
On Main B/D
Normal
Voltage?
Close
Check 5v on Power B/D
☞
A20
Check IR
Output signal
Normal
Signal?
N
Repair/Replace
IR B/D
N
Normal
operating?
Close
If R/C operate,
Explain the customer
cause is interference
When turn off light
in room
Baterry of R/C
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
IR B/D
Replace R/C
cause is interference
from light in room.
N
2. Local(Mechanical) switch operating error
Y
Ch k R/C
N
l
Check & Repair
N
l
N
Check & Replace
Ch k K
N
l N
N
l
Replace
Main B/D
Y
Move
Y
N
Check R/C
Operation
Normal
operating?
Y
Check & Repair
Cable connection
Connector solder
Normal
operating?
Close
N
Check & Replace
Assembly status
(Key PCB + tool )
Check Key
Output signal
Y
Normal
operating?
Close
N
Normal
Signal?
Repair/Replace
N
Y
Move
Power problem
Section
p
p
Local switch B/D
10
Click on the first or last page to see other 42SL80YD-AA (CHASSIS:LB91T) service manuals if exist.