LG 55EC9300 Repair Manual page 89

Standard Repair Process
LCD TV
→ abnormal audio/discontinuation/noise is same after "Check input signal" compared to No audio
Check input
signal
-RF
-External Input
signal signal
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Only for training and service purposes
Error
symptom
Wrecked audio/ discontinuation/noise
Y
Signal
normal?
N 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
C. Audio error
Wrecked audio/
Discontinuation/ Discontinuation/
Noise for
all audio
Wrecked audio/
Discontinuation/
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only o se o y
for Analog
Wrecked audio/
Discontinuation/
Noise only Noise only
for External Input
Connect and check
other external
device
9
Established
2013.01.31
date
Revised date
☞A21+A18
Check and replace
Check audio Check audio
speaker and
B+ Voltage (24V)
connector
Normal
voltage? voltage?
Replace Main B/D Replace Main B/D
N
Replace Power B/D
Replace Main B/D
N
Normal
audio?
Y
Check and fix external device
9/16
Y
End
LGE Internal Use Only