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3.Audio Trouble
3.1 No Audio
N
N
Check the
peripheral
audio
Reset
devices
No Audio
Check audio signal input
Y
N
Check
Check U25/SM5964
the
And U25 I/0 interface
speaker
(PIN6,12)
Y
Check the set of volume, mute
Y
Check signal from C11
Y
Check power U3 8th
Y
Check U3 PIN4 and PIN6 for
signal output
N
Y
Examine
and
Check
repair
the
U3 or
output
net
between
U3
E45/100
and CN11
N
U3/TPA1517NE PIN7
11.2V?
Y
Check U3 PIN1 and PIN9 for signal input
N
Chekc U21PIN60,61for signal output
N
Check input audio input
AV:U21 PIN49,50
Check net
PC下:U21PIN53,54
between
Y
N
U21
Check the
PIN60,61
Check
net
And U3
between
PIN1,9
U21
N
Y
Check
power
supply
for U3
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