LG 42LB55 series - Wrecked Audio; Discontinuation;Noise

→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
C. Audio error
Wrecked audio/ discontinuation/noise
Check and replace
speaker and
connector
Connect and check
other external
device
Y
Check and fix external device
Replace Power B/D
N
Y
Check input
signal
-RF
-External Input
signal
(When RF signal is not
received)
Request repair to external
cable/ANT provider
Y
Check audio
B+ Voltage (24V)
(In case of
External Input
signal error)
Check and fix
external device
Replace Main B/D
N
Established
date
Revised date
10/14
LCD TV
Error
symptom
Standard Repair Process
☞A16
2012. 01 .14
End
Signal
Normal
Normal
Voltage
Normal
Audio
Wrecked Audio/
Discontinuation/Noi
se for all audio
Wrecked Audio/
Discontinuation/Noise
only for D-TV
Wrecked Audio/
Discontinuation/Noise
only for Analog
Wrecked Audio/
Discontinuation/
Noise only for
External Input
N
Replace Main B/D
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