Wrecked Audio/ Discontinuation/Noise - LG 42LB55 series Service Manual

Standard Repair Process
Error
LCD TV
symptom
→ abnormal audio/discontinuation/noise is same after "Check input signal" compared to No audio
Check input
signal
Signal
-RF
Normal
-External Input
signal
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Only for training and service purposes
C. Audio error

Wrecked audio/ discontinuation/noise

Y
N
(When RF signal is not
received)
Request repair to external
cable/ANT provider
(In case of
External Input
signal error)
Check and fix
external device
Wrecked Audio/
Check and replace
Discontinuation/Noi
speaker and
se for all audio
connector
Wrecked Audio/
Discontinuation/Noise Replace Main B/D
only for D-TV
Wrecked Audio/
Discontinuation/Noise
only for Analog
Wrecked Audio/
Connect and check
Discontinuation/
other external
Noise only for
device
External Input
Established
2012. 01 .14
date
Revised date
☞A16
Check audio
B+ Voltage (24V)
Y
Normal
Voltage
N
Replace Power B/D
Replace Main B/D
N
Normal
Audio
Y
Check and fix external device
10/14
End
LGE Internal Use Only