Read Sony BDP-S790 Service Manual online
9-3
Pow
er (Sy
s
tem) Flow
AC
I
N
C
heck
the
output
v
olt
ages f
ro
m t
he pow
er
s
upply
block
.
C
N
301 pin
1
: +12V (U
N
SW
12V)
C
N
301 pin 2:
+12V (U
N
SW
12V)
C
N
301 pin
3:
+12V (FE_U
N
SW12V)
No
Yes
Ch
e
ck th
e
fu
se
s
H
av
e any
of t
he below
f
u
se
s
blow
n?
No
M
B
board: PS301,
PS302
Yes
Ch
e
c
k
th
e
f
ollow
ing
pow
er cont
rol signals
w
hile
the
pow
er is ON
PCONT1#
: MB board
R
301
Yes
C
heck the v
o
lt
ages based
on
th
e
s
chemati
c
diagram
- DCDC6V
- UNSW4V
- UNSW3.3V
- 3.3V
- 1.2V
- 1.5V
- FE_SW12V
- FE_SW5V
No
Vol
tage
lines
that
are not
out
put
are shorted
to
G
N
D
No
Failure o
f po
w
er s
upply I
C
->
R
eplac
e
the
I
C
R
eplac
e t
he MB board if
t
here is no
improvement
C
hec
k
t
hat
t
he
harness
has
been
ins
ert
ed
properly.
If
there
is
no
problem
, replac
e t
he
pow
er s
upply block
.
Re
plac
e bl
ow
n f
us
es
Replace the
MB bo
ard if the
re
is no
improve
me
nt
BDP-S790
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