Sony BDP-S780 Service Manual ▷ View online
9-2
Main Flowchart
No
No
Yes
Yes
No
Yes
No
Yes
No
Yes
No
No
No
Yes
Yes
Yes
No
Yes
Yes
No
Yes
No
No
Yes
Yes
No
Yes
Power ON by power switch on front or remote
control.
Has system reset (SYSCON_RST) been
cancelled?
Measurement point JL1122
To Video section flowchart
To IFcon section flowchart
Start (and return from each flowchart)
Approximately 10 seconds after the AC is
applied, the WAIT display flashes several
times and the power is turned OFF
automatically.
Are the power supply voltages on the MB
board normal?
To Power Supply (System) flowchart.
END
Replace the MB board.
To Drive flowchart
BU Adjustment Flow [yy] ~ After BU/MB
Replacement ~
To Drive flowchart
To FL/FR board flowchart
Check the parts and mounting around X401.
Replace the MB board.
To Drive flowchart
BU Adjustment Flow [yy] ~ After BU/MB
Replacement ~
Is OPEN or CLOSE displayed on the
fluorescent tube?
Is there any problem in the FFC connection to
CN2470 which connects the drives?
To FR board flowchart
Is XMB or the SETUP screen displayed on the
video output screen?
Do the up, down, left, and right arrow keys of
the remote control permit operations on the
XMB?
Is the main clock (X401) oscillating properly at
27 MHz?
Check the flexible cable of the drive.
Are CN2470,CN2462 or CN1401
disconnected?
Check the connections of the connectors.
If there is no improvement, replace the MB
board.
To Drive flowchart
BU Adjustment Flow [yy] ~ After BU/MB
Replacement ~
SYS ERR display appears on fluorescent tube.
To Drive flowchart
Is the sound reproduced properly when a BD,
DVD, or other disc is played?
To Audio section flowchart
Is the picture reproduced properly when a BD,
DVD, or other disc is played?
To Video section flowchart
Are BD, DVD, or other discs that are loaded on
the drive recognized correctly?
BDP-S780
9-3
Pow
er (Sy
s
te
m) F
low
AC
I
N
C
hec
k
th
e
out
put
v
o
lt
ages
fr
o
m t
h
e pow
er
s
upply
bloc
k
.
C
N
301
pin
1:
+12V (
U
NS
W
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 t
he
fu
s
es
Ha
v
e any
of
t
he
below
f
us
e
s
blow
n?
No
M
B
board: PS301,
PS302
PS1201
-
Yes
Ch
e
ck
th
e
f
ollow
ing
pow
er c
on
trol
s
ignal
s
w
hile
th
e
pow
e
r is ON
PC
ON
T
_C
OR
E
: MB board
R
327
PC
ON
T
2
:
M
B board
R1236
P
CO
N
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
Ch
e
c
k
t
he
vo
lt
age
s ba
se
d
on
th
e
s
che
m
at
ic
diagram
No
Volt
age
lines
th
a
t are no
t ou
tpu
t
are s
hort
ed
to
G
N
D
No
F
ailure o
f
pow
er
s
upply
I
C
->
R
eplac
e
th
e
IC
R
eplac
e t
he MB board if
t
here is
no
improvement
Ch
e
c
k
th
a
t
th
e
harnes
s
ha
s
been ins
er
ted
properly.
I
f t
here
is
no problem
, replac
e
the
pow
er
s
upply
blo
c
k
.
Re
plac
e blown
fu
se
s
Re
p
lac
e t
he
MB
b
oard i
f the
re
is n
o
improve
m
en
t
To
I
Fc
o
n
s
e
c
ti
o
n
Fl
o
w
BDP-S780
IF
c
o
n S
e
c
ti
o
n F
lo
w
C
h
a
rt
(1
/2
)
IF Con block power supply check
UN
S
W
3.3V
vol
tage (+3.3V
)
Is
3
.3
V
output f
ro
m
IC301 pi
n
4
?
N
o
Input
vol
tag
e
Is +3.8V i
nput to IC301 p
in5?
No
No
Input voltage
Is +11.8V input to IC302 pin2?
Y
es
Yes
Yes
Repl
ace IC301
If sym
p
tom
s do not i
m
prove,
check for a
short
on t
he
c
ir
c
u
it
boa
rd
RE
G cont
ro
l
vo
ltage
Is
+3
.8
V
i
nput
to IC301
pi
n
1
?
No
Replace R304
If the symtoms, replace IC301
Y
es
Re
pl
a
ce
I
C3
01
P_
F
AI
L
d
etec
tio
n
o
p
er
a
tio
n
c
h
e
ck
Check t
he
P_
F
A
IL vo
ltag
e
No
No
Is +3.3V
output f
ro
m
IC120
4
pi
n2
?
Yes
M
ai
n uni
t
key check
Check
of key vol
tage fr
o
m ma
in
u
n
it
K
e
y
Ta
b
le
(*
) w
h
e
n key i
s
presse
d o
r not presse
d
No
No
POW
E
R:
CN1203 pi
n1(JL126
9
)
KEY0
S
T
OP
:
C
N1204 pi
n21(JL1233)
KEY1
OPE
N/CLOSE
:
CN1204
pi
n22(JL1232)
KE
Y
2
P
L
A
Y
:
CN
1204 p
in23(JL1231
)
K
E
Y3
Yes
R
em
o
te co
nt
ro
l
o
p
e
ra
ti
o
n
ch
eck
Chec
k
t
he w
avef
o
rm
w
hen
the
rem
o
te
control
but
ton i
s
not pres
s
ed
No
Chec
k
w
hether
t
he
F
FC
i
s
d
isconnect
e
d
from
CN12
0
4
. (Ot
he
r than the
POW
E
R key)
No
Check of the 3.3V vol
tage
C
N1204 pi
n5
a
nd
IC1203
pi
n31
Yes
Check
of
th
e
w
ave
for
m
w
hen
th
e
key
is
pres
sed
In com
pari
son w
ith
a
norm
al
w
a
ve
fo
rm
,
is
the w
a
v
eform
o
f t
he
vol
ta
ge
o
utp
u
t
tl
?
No
Is
the rem
o
te
c
on
tro
l t
ha
t i
s used i
n
th
e
inspect
io
n
broken
?
No
Does repl
acem
ent of the
FR
board r
e
sul
t i
n
im
provem
ent
?
No
Y
es
Check w
hether the F
F
C i
s di
sconnected
fro
m
CN
120
4
.
Yes
Rep
la
c
e
R1264
and chec
k
for +3.3V
at
I
C120
4
pi
n1
If sym
p
tom
s do not
i
m
pro
ve, repl
ace
IC120
4
(P
_FA
IL detecti
o
n)
* Ke
y T
ab
le
In
pu
t
(K
EY0
)
(K
EY
1)
2.
90
-
0.
00
-
Ke
y_O
FF
PO
W
ER
Ke
y_
OF
F
ST
OP
O
PEN/
CLOSE
(K
EY
2)
(K
EY
3)
Key_
OF
F
Key_
OF
F
PLAY
B
To
FR
boar
d
Fl
ow
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?
Y
es
Replace RB1201,RB1202,C1213,C1214,
C1215 and C1216. If the symptoms do not
improve, replace IC1203 or MB board
Ye
s
DCDC4V voltage (+3.8V)
Is 3.8V output from IC302 pin 3?
Does repl
acem
ent
o
f
the
FR
b
oar
d
resu
lt i
n
im
provem
e
nt?
No
Yes
To
FR
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
BDP-S780
IF
co
n
Secti
o
n
F
lo
w
Ch
art(2/
2)
C
he
c
k o
f
IF
c
on
res
e
t
in
p
u
t
p
or
t
Is
t
h
e v
ol
tage of
IC
1
2
0
3
"H"(3.3V
)?
No
Is
there
a pro
b
le
m w
ith
th
e
mo
u
n
tin
g
c
o
n
d
itio
n
o
f
R121
2
,
C122
1
or R1208
?
Ye
s
Yes
P
c
o
nt output por
t c
h
ec
k
Check
of
each pow
e
r suppl
y cont
rol
port
wh
e
n
t
h
e
p
o
we
r i
s
ON
* Co
rrespon
d
ing
ou
tput
IC120
3
pi
n15 PCO
N
T1
IC
1203 pi
n 17PCO
NT
2
IC12
03 pi
n21
P
CO
NT
3
IC12
0
3
p
in
2
3
P
C
ON
T
_
C
O
R
E
IC1203
pi
n
2
4 AT
A
_PCONT1
S
W3
.3V
a
nd SAT
A
_
1.
2VA
out
p
ut
CO
RE
_
1
.1V ou
tput
DDR2_
1
.8
V
s
ys
tem
o
u
tp
u
t
DCSW
5V
FE
_
SW
5V
No
C
h
e
c
k
fo
r
sh
o
rt
s
a
t
ea
c
h po
rt
No
A
ll t
h
e
p
ort
s
go "H"
w
ithi
n
2
t
o
10 ms, but
soo
n
go
"
L
"
No
D
o
th
e
s
ym
pt
oms i
m
prov
e
af
te
r checki
ng
th
e
so
lderi
ng an
d
pat
tern o
f
IC
1
2
0
3
?
N
o
P
ow
e
r
s
uppl
y
out
put c
h
e
c
k
Check
th
e out
p
ut
o
f th
e
c
o
rrespon
di
ng
v
ol
ta
ge
SW
3.
3V S
h
or
t
ci
rc
uit
op
era
tio
n
ch
eck
No
To
P
ow
er
Suppl
y (S
ys
te
m)
fl
o
w
ch
art
N
o
Wh
e
n
IC120
3
pi
n15
P
CO
NT
1
has gone "H",
is
t
he
SW
3
.3
V
vo
lta
g
e
out
put
?
Y
es
Rep
lace
IC
1
20
3
or repl
ac
e
th
e
M
B boar
d
Y
e
s
C
h
eck SY
S
_
R
S
T s
ig
na
l o
ut
put
Is
IC
1
2
0
3
p
in
5
1
"H"(3.3V)?
T
he m
o
un
ting condi
tion
o
f
R
1156
are OK?
N
o
Rep
la
ce
IC
1
2
0
3
a
nd the M
B
boa
rd
Ye
s
Ch
eck
the
c
om
m
u
ni
ca
ti
on
w
ith the h
o
s
t
C
P
U
(SY
S
CO
N_
R
EQ
si
gnal
ch
e
ck
)
Do cy
cl
ic
al
"H"
an
d
"L
" commu
n
ica
tio
n
wa
v
e
fo
rms
com
e
to
IC
1
2
03 pi
n
3
0
?
N
o
Is
t
he
re a
prob
lem
w
ith
t
he
mo
u
n
ting
condi
ton of
R126
2
?
No
D
o
t
he
sy
m
pt
oms
improv
e
a
ft
er
repl
ac
in
g
IC
1
0
1
?
No
Ye
s
Ch
eck th
e
c
om
m
u
nic
a
tion w
ith t
he
hos
t
CPU
(Serial
co
m
mu
n
ic
a
tion
si
g
n
al
c
h
e
c
k
)
Do c
ycl
ic
a
l "H"
an
d
"L
" com
m
uni
cat
io
n
w
a
ve
fo
rms
come
to
IC
1
2
03 pi
n4
7
,
p
in
48
and pin
4
9?
N
o
Is there a pro
b
le
m
w
ith
t
h
e
mo
unt
ing
cond
ito
n
o
f
RB
124
0,
R1
2
4
3
and
R1
24
6
N
o
R
epl
a
ce
IC
1
2
0
3
or r
e
pl
a
c
e
t
he
M
B
board
Is
t
h
e
v
o
lta
g
e
a
t t
h
e
"
H
" l
e
ve
l(
3.
3
V)
?
SW3
.3V and SW5V
1.
2
VA
and
CORE_1.1V
DAC3.3
V
, 3.
3
VA
DCDC6V, DCDC4V
FE_
S
W
1
2V nad FE_SW5V
A
B
9-5
IC1203
pi
n2
AT
A_
P
CONT2
Ye
s
Ye
s
Ye
s
Ye
s
Replace IC1203 or replace MB board
BDP-S780
Click on the first or last page to see other BDP-S780 service manuals if exist.