NO sound
Any audio signal input or
Is amplifier power supply normal
Check audio
equipment:
power amplifier
circuit
Check U20
（
TPA1517
）
#1/9
pin whether or not normal
N
Y
Y
N
Check
Q24,Q25
external circuit
V
o
l
u
m
e
,
M
U
T
E
s
e
t
W
h
e
t
h
e
r
o
r
n
o
t
n
o
r
m
a
l
R
e
s
e
t
c
heck CON12
any
si
gnal output
Y
N
E
x
a
m
i
n
e
e
x
t
e
r
n
a
l
S
p
e
a
k
e
r
C
h
e
c
k
p
o
w
e
r
C
i
r
c
u
i
t
o
f
Q
1
,
i
f
p
o
w
e
r
s
u
p
p
l
y
i
s
n
o
r
m
a
l
,
c
h
a
n
g
e
Q
1
C
he
c
k
Q
2
5
,
Q
2
4
#
3
p
i
n
W
he
t
h
e
r
t
h
e
r
e
i
s
a
s
i
g
n
a
l
o
u
t
p
u
t
N
Y
N
Check the network
connects U20 and
Q24,Q25
Pi
ct
ure
4
A
ud
io
U
nit
(
NO
s
ou
nd)
Y
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