Sony BDP-BX38 / BDP-S280 / BDP-S380 / BDP-S383 Service Manual ▷ View online
9-3
Pow
er (Sy
st
em) F
low
AC
IN
C
hec
k t
he out
put
v
olt
ages f
rom
the pow
er
supply
bloc
k.
C
N
201 pin 1:
+12V (U
N
SW
12V)
C
N
201 pin 2:
+12V (U
N
SW
12V)
C
N
201 pin
3:
+12V (FE_U
N
SW12V)
- -
No
Yes
C
heck
th
e f
us
es
H
av
e any
of
th
e below
fu
se
s blow
n?
No
M
B board: PS301,
PS302
PS1201 -
Yes
C
heck
the f
ollow
ing pow
er c
ont
rol s
ignals
w
hile t
he pow
er is
ON
P
CO
NT_
CO
RE
: M
B
b
oa
rd
R3
27
PC
ON
T2
: M
B board
R1236
PC
ON
T
3:
M
B board
R
305,R
307,R
309,R
343
AT
A_PC
ON
T
: M
B board
R
376
No
Yes
C
heck
the v
olt
ages
bas
ed on t
he s
chem
at
ic
diagram
No
Volt
age lines
that
are not
out
put
are s
hort
ed
to
G
N
D
No
F
ailure of
pow
er s
upply
IC
-> R
eplac
e t
he I
C
R
eplac
e t
he M
B board if
there is
no
improvement
C
hec
k t
hat
the harness
has
been ins
ert
ed
properly.
If
there
is
no problem
, replac
e t
he
pow
er s
upply
bloc
k.
Re
plac
e blown
fu
se
s
Re
plac
e the
MB board if the
re
is n
o
improve
m
en
t
T
o I
F
con s
ec
tion F
low
BDP-BX38/S280/S380/S383
IF
co
n S
ec
ti
o
n F
lo
w
C
h
art
(1
/2
)
IF
co
n
b
lo
ck
ower
su
l
ch
eck
UNSW
3.3V vol
tage (+3.3V)
Is 3.3V output f
rom
IC301 pi
n4?
No
Input vol
tage
Is +3.8V
in
put to IC301 p
in5?
No
No
Input voltage
Is +11.8V input to IC302 pin2?
Yes
Y
es
Yes
Repl
ace IC301
If sym
ptom
s do not i
m
prove,
check for a
short on the c
ircui
t board
R
E
G
c
on
tr
ol v
olt
ag
e
Is +3.8V
in
put to IC301 p
in1?
No
Replace R304
If the symtoms, replace IC301
Y
es
Rep
lace IC301
P_F
A
IL
d
etect
io
n
o
p
er
atio
n
ch
eck
Check the P_F
A
IL vol
tage
No
No
Is +3.3V
output f
rom
IC1204
pi
n2
?
Y
es
Ma
in uni
t
key check
Check
of key vol
tage from
m
ai
n uni
t Key
T
abl
e (
*) w
hen key i
s pressed or not pressed
No
No
POW
E
R:
CN1203 pi
n1(JL126
9)
KEY0
ST
OP:
CN1204 pi
n21(JL1233)
KEY1
OPE
N/CLOSE
:
CN1204 pi
n22(JL1232)
KEY2
PLAY:
CN1204 pi
n23(JL1231
)
KEY3
Y
es
Rem
o
te co
n
tr
o
l o
p
er
atio
n
ch
eck
Check the w
aveform
w
hen the rem
ote
contr
ol
button i
s not pressed
No
Check w
hether
the F
F
C i
s di
sconnected
from
CN1204
. (Other than the POW
E
R key)
No
Check
of the 3.3V vol
tage
CN1204 pi
n19
and
IC1203
pi
n31
Y
es
Check
of the w
aveform
w
hen the key i
s
pressed
In com
pari
son w
ith a norm
al
w
aveform
, i
s
the w
aveform
o
f the vol
tage output
tl
?
No
Is the rem
ote control
that i
s used i
n the
inspect
ion broken
?
No
Does repl
acem
ent of the
IF
board resul
t i
n
im
provem
ent?
No
Y
es
Check w
hether the F
F
C i
s di
sconnected
from
CN1204
.
Yes
Repl
ace
R1264
and check for +3.3V
at
I
C1204 pi
n1
If sym
ptom
s do not i
m
prove, rep
lace
IC1204
(P_FAIL detecti
on)
* K
ey
T
ab
le
Inp
ut
(K
EY
0)
(K
EY
1)
2.
90 -
0.
00 -
Key_
OFF
PO
WER
Key_
OFF
STOP
O
PEN/
CLOSE
(K
EY
2)
(K
EY
3)
Key_
OF
F
Key_
OFF
PLAY
B
To
IF
boar
d F
lo
w
BDP-BX38/S280/S380/S383
/
9-4
Is there voltage of about 3.3V at pin 21,22
and 23 of CN1204 and pin 1 of CN1206
without pressing the keys?
Is there a problem with the mounting
condition of RB1201,RB1202,C1213,C1214,
C1215 and C1216?
Ye
s
Replace RB1201,RB1202,C1213,C1214,
C1215 and C1216. If the symptoms do not
improve, replace IC203 or MB board
Ye
s
DCDC4V voltage (+3.8V)
Is 3.8V output from IC302 pin 3?
Does repl
acem
ent
of
th
e
IF
board resul
t i
n
im
provem
ent?
No
Yes
To
IF
boar
d F
lo
w
If the FFC from CN1204
disconnected?
(other than POWER KEY)?
Is the harness from CN1203
disconnected?
(POWER KEY)
No
Yes
Replace R302
If the symtoms do not improve, replace IC302
Is the fuse (PS301) blown?
Replace PS301
if the symptoms do not improve,check for
a short on the circuit
No
To
Power Supply (System)
o
EN control voltage
Is +11.8V input to IC302 pin2?
No
N
Yes
Replace IC302
A
IF
co
n
Secti
o
n
F
lo
w
Ch
art(2/
2)
C
h
ec
k of IFc
o
n res
et
in
p
ut
p
or
t
Is
th
e v
ol
tage of
IC
12
03
"H"(3.3V)?
No
Is
the
re
a
pr
ob
le
m w
ith
th
e mo
un
tin
g
co
nd
itio
n o
f
R1212
, C122
1 or R1208
?
Ye
s
Y
es
P
co
nt output por
t c
h
ec
k
Check
of each pow
er supp
ly
control
port
wh
en
th
e p
owe
r i
s O
N
* Co
rrespon
d
in
g
o
u
tp
u
t
IC120
3 pi
n15 PCONT
1
IC
1203 pi
n 17PCO
NT
2
IC
12
03 pi
n21 PCO
NT
3
IC
12
03
p
in
23
P
C
ON
T_
C
O
R
E
IC1203
pi
n24 AT
A_PCONT1
SW
3.
3V and SAT
A
_
1.
2VA
out
put
CORE_1.1V output
DDR2_1
.8V sy
stem output
D
C
SW
5V
FE_
S
W
5V
No
Check f
or shorts at each port
No
A
ll the
po
rt
s go
"
H
" w
ithi
n 2
to
10
ms, bu
t
soon go "L"
No
Do the sy
mptoms i
m
prov
e after checki
ng
the
sol
deri
ng and pat
tern of
IC
12
03
?
No
Pow
er supp
ly
ou
tpu
t check
Check t
he out
put
of
th
e correspondi
ng
vo
lta
ge
SW3.3V Short circui
t op
era
tion
check
No
To
Pow
er Suppl
y (Sy
stem) fl
ow
chart
No
Wh
en
IC
1203
pi
n15 PCO
NT
1
has gone
"H",
is
th
e S
W
3.
3V
v
olt
ag
e o
ut
pu
t?
Ye
s
Rep
lace
IC
12
03
or repl
ace the M
B
boar
d
Ye
s
Ch
eck SY
S_RST
sig
n
al
o
u
tp
u
t
Is
IC
12
03
p
in
51
"H"(3.3V)?
Th
e m
ount
ing condi
tio
n of
R1156
are OK?
No
Repl
ace
IC
12
03
and the M
B
boar
d
Ye
s
C
h
ec
k the
c
o
m
m
unic
at
ion w
ith the
hos
t
CPU (SY
S
CO
N_REQ
si
gn
al ch
eck)
Do cy
cl
ic
al
"H" and "L" communi
cat
io
n
w
av
eforms come to
IC
1203
pi
n30
?
No
Is
there
a prob
le
m w
ith the mounti
ng
condi
ton of
R126
2
?
No
Do the sy
mptoms i
m
prov
e after repl
aci
ng
IC
10
1?
No
Ye
s
Ch
eck th
e co
mmu
n
icati
o
n
w
ith
th
e h
o
st
CPU
(Seri
al
co
mmu
n
ic
ati
o
n
si
g
na
l c
he
ck
)
Do cy
cl
ic
al
"H" and "L" communi
cat
io
n
w
av
eforms come to
IC
1203 pi
n47,
p
in
48
and pin49
?
No
Is
th
ere a probl
em w
ith
th
e mount
ing
condi
ton of
RB124
0,
R1243 a
nd
R1246
No
Repl
ace I
C
1203 or repl
ace t
he M
B
board
Is
th
e v
olt
ag
e a
t t
he
"
H
" le
ve
l(3
.3
V
)?
SW3.3V and SW5V
1.
2VA and CORE_1.1V
DAC3.3V, 3.3VA
DCDC6V, DCDC4V
FE_SW
12V nad FE_SW5V
A
B
9-5
IC1203 pi
n2
AT
A_PCONT2
Ye
s
Ye
s
Ye
s
Ye
s
Replace IC1203 or replace MB board
BDP-BX38/S280/S380/S383
/
BDP-BX38/S280/S380/S383
9-6
Audi
o secti
on fl
ow
chart
Audi
o does not sound ri
ght
No
Vi
deo i
s output properl
y
No
To Vi
deo secti
on fl
ow
chart
Yes
Is the F
L di
spl
ay/LED di
spl
ay correct?
No
To M
ai
n fl
ow
chart
Yes
Is the dri
ve operati
ng proper
ly
?
No
To Dri
ve fl
ow
chart
Yes
Is each pow
er suppl
y suppl
ied to the AUDIO
Bl
ock?
No
To
Pow
er Suppl
y (
System
) fl
ow
chart
I
C
305 pi
n4: DAC 3.3V
Yes
Onl
y Anal
og 2ch L/R Audi
o affected?
No
Onl
y Di
gi
tal
Audi
o (HDM
I, Coax
)
affected?
No
Repl
ace the M
B board
Yes
Yes
Is there HDM
I output?
No
Rep
lace the M
B board
Is there Coax
ia
l output?
No
Is there audi
o system
di
gi
tal
si
gnal
input to
IC907
?
IC907 pi
n1: AOMCLK
IC907 pi
n10:AOBCK
No
Repl
ace the M
B board
Yes
Are control
si
gnal
s i
nput to IC907?
IC907pin7: MUTE
No
Repl
ace the M
B board
Y
es
Is there a probl
em
w
ith m
ount condi
tio
n of
C923
No
Repl
ace IC907 or repl
ace M
B board
Check output resistor/capasitors (R922,R923,C920,C918)
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