Skyworth 8M51B, Service Manual

Page: 60 / 71

Y
Y
Y
Y
Y
OK
OK
OK
OK
OK
OK
N
N
N
N
N
N
N
N
N
N
N
Has audio but no video
Check
if
the
backlight
is
on
Done
Check
the
connector
of
b
ackli
g
ht
inve
rter
connected
Check
the
L
VDS
line
if
it
is
connected
Safely
connect
the
inverter
line
Check
the
voltage
of
inverter
line is
24V
Done
Y
Y
Y
N
N
N
Check
the
“ON/OFF”
voltage
on
“CN7”,
sh
ould
be
greater
than
2.7V
Check
“Q39”
&
“U9”
PinAB24
if
it
works
well.
Change
the
panel.
Done
Upgrade
the
software
Change
the
“Q
39”
or
“U9”
Change
the
“U9”
Done
Done
Done
Upgrade
the
software
Done
Safely
connect
the
L
VDS
line
Make
sure
the
L
VDS
power
is
correct
(5V
for
26”
,
12V
for
32”&42”
)
Done
Change
the
FLASH U8
U43
Done
Correct
the
p
owe
r
Chane
the
main
IC
U9
Done
Change
the
ma
in
b
oar
d
Done
Done
Service Flow Chart