Haier HLE20BB Service Manual page 30

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 U20 PIN8≥9.2V ?
Check U20 PIN1 and PIN9 for signal input
Y
Check U20 PIN4 and PIN6 for
signal output
N
Y
Examine and
Check
repair the
U20 or output net
between
E45/100
U20and CN11
N
U20/TPA1517NE PIN7
11.2V?
Y
N
Chekc U21PIN60,61for signal output
N
Check input audio input
AV:U21 PIN49,50
PC:U21PIN53,54
Check net
between
Y N
U21
Check the net PIN60,61
Check
between And U20
U21
audio input PIN1,9
and U21
N
Y
Check
power
supply
for
U20