LG 32LH500D - Audio error - Wrecked audio; discontinuation;noise

Standard Repair Process
Check input
signal
-RF
-External Input
signal
Check and replace
speaker and
connector
Replace Main B/D
(When RF signal is not
received)
Request repair to external
cable/ANT provider
Signal
Normal
Y
Wrecked Audio/
Discontinuation/Noise
for all audio
N
Wrecked Audio/
Discontinuation/Noise
only for ATV
LED TV
Error
symptom
Audio error
Established
date
2016.03.07
Wrecked audio/ discontinuation/noise
Revised date
9/12
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
A8
Replace Main B/D
Check amplifier
power
+AMP_Power(12V)
Normal
Voltage
Y
N
Replace Power B/D