Skyworth 8M51B, Service Manual

Page: 57 / 71

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Y
N
N
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N
Y
Y
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Y
N
N
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N
Y
N
No
audio
&
N
o
backli
g
ht
Led
indicator
“red” on
Check
the
5V
STB
on
“CN7”
Press
the
“ON/OFF”
on
key
boar
d
&
re
m
o
te
control
,
led
turns
g
reen
Check
the
AC
input on
p
ower
su
pp
ly
boar
d
Upgrade
the
software
Change
the
AC
line
Check
the
fuse
on
power
supply
board
Done
Change
the
fu
se
Change
the
power
supply
b
oar
d
Done
Done
Upgrade
the
software
Check
the
5V
,
12V
&
24V
on
p
ower
su
pp
ly
board
Change
the
power
supply
b
oar
d
Check
the
“ON/OFF”
voltage
on
“CN7”,
sh
ould
be
greater
than
2.7V
Check
“Q39”
&
“U
9
” Pin
"K4"
if
it works
well.
Change
the
panel.
Done
Upgrade
the
software
Change
the
“Q
39”
or
“U9”
Change
the
“U9”
Done
Done
Done
Done
Upgrade
the
software
Done
Done
Change
the
FLASH U8
Done
Done
Check
all
DC
power
su
pp
ly
on
U9
Chang
the
power
su
pp
ly
IC
for
U9
Change
the
Main
IC
“U9”
Change
the
Main
b
oard
Done
Done
Done
Service
Flow
C
hart