Skyworth 8M51B, Service Manual

Page: 58 / 71

N
N
N
OK
OK
Y
Y
N
N
=0
V
>0
V
OK
Has video
but no audio
Check
if
the
V
o
lu
m
e
has
set
to
“0”
o
r i
f t
h
ei
ti
sm
u
te
Done
Check
the
voltage
of
“Mute”
pin
bes
ide
the
am
p
lifier
IC. It s
h
ould not
be
0V
.
Check
the
m
u
te
circuit
if
it
is
OK.
Done
Fix the m
u
te
circuit
Upgrade
the
so
ftware
Change
the
m
ain
IC
“U9”
Done
Change
the
m
ainboard
Done
Done
Check
the
audio
input
line
&
the
audio
in
p
ut
circuit.
Done
Service
Flow Chart