Wrecked Audio/ Discontinuation/Noise - LG 42SL90QD Service Manual

Standard Repair Process
Error
LCD TV
symptom
→ Wrecked audio/discontinuation/noise is same after "Check input signal" compared to No audio
Check input
signal
Signal
-RF
normal?
-External Input
signal signal
N N
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Only for training and service purposes
C. Audio error

Wrecked audio/ discontinuation/noise

Y
(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
Established
date
Revised date
Wrecked audio/
Check and replace
Discontinuation/ Discontinuation/
speaker and
Noise for
connector
all audio
Wrecked audio/
Discontinuation/
Replace Main B/D Replace Main B/D
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
Check and fix external device
9
2008. 3 .26
9/13
☞A26
Check audio Check audio
B+ Voltage (20V or 24V)
Y
Normal
voltage? voltage?
N
Replace Power B/D
End
Replace Main B/D
N
Normal
audio?
Y
LGE Internal Use Only