15
POWER
SUPPLY
BOARD
FAULT
JUDGMENT
Circuit
system
drawing
for
power
board
Way
of
check
up
and
servicing
1
.
No inputting voltage
2
.
Input
fuse
open
circuit
No Turning
on the TV
Familiar
Fault
Cause
1
.
Check
input
power
supply
2
.
Select
ON
a
ccording to
power
switch
and
standby
.
3
.
Connect
power
supply
wire
and
connecter
newly
.
4
.
Raplace
the
same
type
and
spec
fuse
1
.
Brightness
is
ajusted
to
black
2
.
DC
output
wire
and
con
-
necter
is
no
good
.
3
.
No
PSON
signal
of
turning
on
the
TV
Black
Screen
1
.
Adjust
brightness
to
mezzo
state
.
2
.
Check
DC
output
wire
and
connecter
.
3
.
Check
voltage
on
Cn4
STB
PIN
,
if
this
voltage
is
less
than
2
.
5V
,
please
check
TV
main
board
.
Familiar
Fault
,
Way
of
check
-
up
and
servicing
AC
INPUT
Cell
of
Prevent
thunder
EMI
circuit
Commute
,
filter
Commute
,
filter
Output
PFC
cell
PWM
controller
Level
off
voltage
,
round
pathway
Sampling
+
24V
(
+
12V
)
+
+
Protect
flowing
by
Protect
short circuit
Protect
outputting
voltage
P o w e r
,
commutation
