LG 32LF550B Service Manual page 47

Standard Repair Process
Error 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
Discontinuation/ Noise
(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
Check and replace
Audio/Discontinuation/
speaker and
Noise for all audio
connector
Wrecked Audio/
Replace Main B/D
only for D-TV
Wrecked Audio/
Discontinuation/ Noise
only for Analog
Wrecked Audio/
Connect and check
Discontinuation/ Noise
other external
only for External Input
device
Established
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