→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
C. Audio error
Wrecked audio/ discontinuation/noise
Wrecked audio
/Discontinuation
/Noise for all
audio
Check and
replace speaker
and connector
Wrecked audio
/Discontinuation/
Noise only
for D-TV
Wrecked audio/
Discontinuation/
Noise only
for Analog
Wrecked audio/
Discontinuation/
Noise only for
External Input
Connect and
check other
external device
N
Y
Normal
audio?
Check and fix external device
Replace Power B/D
N
Y
Normal
voltage?
Check input
signal
-RF
-External
Input signal
Signal
normal?
(When RF signal is not
received)
Request repair to
external cable/ANT
provider
Y
Check audio
B+ Voltage (24V)
Replace Main B/D
(In case of
External Input
signal error)
Check and fix
external device
Replace Main B/D
N
End
Established
date
Revised date
10/14
LCD TV
Error
symptom
Standard Repair Process
☞A25
10
2010.12.14
Copyright © 2011 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Summary of Contents for 42LV770S
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