LG 32LB520B Service Manual page 39

Standard Repair Process
Error
LED 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/Noise
speaker and
for all audio
connector
Wrecked Audio/
Discontinuation/Noise Replace Main B/D
only for D-TV
Wrecked Audio/
Connect and check
Discontinuation/Noise
other external
only for External Input
device
Established
2014. 07.07
date
Revised date
☞A16
Check amplifier
power +12V
Y
Normal
Voltage
N
Replace Power B/D
Replace Main B/D
N
Normal
Audio
Y
Check and fix external device
10/14
End