Haier HLE20BB Service Manual page 30

3.Audio Trouble
3.1 No Audio
Check audio signal input
N
N
Y
Check the
peripheral
audio
Reset
Check
devices
the
speaker
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No
Audio
Y
Check the set of volume, mute
Check power U20 PIN8≥9.2V ?
N
Check U20 PIN4 and PIN6 for
N
Check U25/SM5964
Check
And U25 I/0 interface
U20 or
(PIN6,12)
E45/100
Y
Check signal from C11
N
U20/TPA1517NE PIN7
11.2V?
Y
Y
Check U20 PIN1 and PIN9 for signal input
N
Y
Chekc U21PIN60,61for signal output
signal output
N
Y
Check input audio input
AV:U21 PIN49,50
PC:U21PIN53,54
Examine and
Y N
repair the
Check the net
output net
Check
between
between
U21
audio input
U20and CN11
and U21
N
Y
Check
Check net
power
between
supply
U21
for
PIN60,61
U20
And U20
PIN1,9