Read LG 42LM3400 / 42LM340S / 42LM340T (CHASSIS:LD21C) Service Manual online
D. Function error
Remote control & Local switch checking
Y
N
1. Remote control(R/C) operating error
Check R/C itself
Operation
Normal
operating?
Normal
operating?
Y
Close
Replace R/C
If R/C operate,
Explain the customer
cause is interference
from light in room.
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check & Repair
Cable connection
Connector solder
Normal
operating?
Check B+
3.5V
On Main B/D
☞A17
Normal
Voltage?
Close
N
N
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
☞A4
Check IR
Output signal
Normal
Signal?
N
Y
Repair/Replace
IR B/D
N
☞A17
Replace
Main B/D
Y
☞A17
Standard Repair Process
Established
date
Revised date
11/14
LCD TV
Error
symptom
2012. 01 .14
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