Sony BDP-BX18 / BDP-S185 / BDP-S186 Service Manual ▷ View online
9-3
Pow
er (Sy
s
tem) F
low
AC
I
N
C
hec
k
t
he out
put
v
olt
ages f
rom
t
he pow
er
s
upply
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
t
he f
u
s
e
s
H
av
e
any
of
t
h
e below
f
us
e
s blow
n?
No
M
B board: PS301,
PS302
Yes
C
heck
t
he f
ollow
ing pow
er c
ont
rol s
ignals
w
hile t
he pow
er is
ON
PC
ON
T
_C
OR
E:
M
B board R
327
PC
ON
T2
: M
B board
R1236
PC
ON
T
3:
M
B board
R
305,R
3
07,R
309,R
343
AT
A_PC
ON
T
: M
B board
R
376
Yes
C
heck
t
he v
olt
ages
bas
ed on t
he s
c
hem
at
ic
diagram
No
Volt
age lines
t
hat
are not
out
put
are s
hort
ed
to
G
N
D
No
F
ailure of
pow
er s
upply
I
C
-> R
eplac
e t
he I
C
R
eplac
e t
he M
B board if
t
here is
no
improvement
C
hec
k
t
hat
t
he harness
has
been ins
ert
ed
properly.
I
f t
here
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
BDP-BX18/S185/S186
BDP-BX18/S185/S186
9-4
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
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
T
o Pow
er Suppl
y (
S
ystem
) fl
ow
chart
I
C
306 pi
n3:
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
ial
output?
Is there audi
o system
di
gi
tal
si
gnal
in
put to
IC902
?
IC902 pi
n1: A
LO_R
IC902 pi
n10:ARO_R
No
Repl
ace the M
B
board
Yes
Are control
si
gnal
s i
nput to IC902?
IC902pin7: MUTE
No
Repl
ace the M
B
board
Y
es
Is there
a probl
em
w
ith m
ount condi
tio
n of
IC902
No
Repl
ace IC902 or repl
ace M
B
board
Check output resistor/capasitors
(R922,R923,C920,C918)
No
9-5
V
ide
o
se
cti
o
n
f
lo
w
cha
rt
R
epr
oduced vi
deo does not
appea
r r
ight
Ye
s
Is
the
FL d
isp
la
y/L
E
D d
isp
la
y co
rr
e
ct?
No
To M
a
in
f
low
cha
rt
Ye
s
Is the drive o
p
erating pro
perly?
No
T
o
Driv
e
f
lo
wc
h
a
rt
Yes
Ch
e
ck t
h
e
in
p
u
t p
o
we
r
No
IC
10
1
p
in
D16 & E16 : +3.3V
Yes
Is
a v
ideo s
ignal
output f
rom
IC
1
0
1
?
No
Check the writing from IC101
Y
e
s
Is
a s
ignal
output f
rom
eac
h
Vi
deo output
conn
e
c
to
r?
No
C
h
e
ck out
p
ut
inductors (L902)
BDP-BX18/S185/S186
T
o
Power (System)
f
low
c
h
ar
t
P
in B18 : VDACX_OUT
IC
10
1
p
in
D12 : +3.3V
C
h
e
ck out
p
ut
resistors (R920)
Key
1
does not o
p
erate
Is there v
oltage of about 3.3V at pin
of
CN701
w
ithout
p
ressin
g
the ke
ys?
No
Yes
Check the potential voltage CN701
pin3 change from +3.3V to near 0V
when pressing the stop button.
9-6
BDP-BX18/S185/S186
FR-316 IF board flow chart
Does sy
mptom
impr
ov
e w
hen replace
FR-316
board?
Yes
W
hich row
of key
s
do not operate?
STOP
b
u
tto
n
s ->
Key
1
does
not oper
ate
Reference: Relationship of Buttons and Voltages
OPEN
/C
LOSE button -
>
Key
2
does
not oper
ate
PLAY
button ->
Key
3
does not operate
Input
2.90-3.30
0.00-0.40
KEY0
Ke
y_OFF
POWER
KEY1
Ke
y_OFF
STOP
KEY2
Ke
y_OFF
OP
EN/CLO
SE
KEY3
Ke
y_OFF
PL
AY
Reconnect FFC, if symtoms
donot improve, replace
FFC
Does FFC disconnected
CN702
or broken
from
Yes
No
Disconnected FFC or
FR-316
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does FFC disconnected
CN701
or broken
from
Yes
Check IC101,
B23
Check pattern and S701
might be broken
Yes
Is there v
o
ltage of about 3.3V at pin
2
of
CN701
w
ithout
p
ressin
g
the ke
ys?
Yes
Check the potential voltage CN702
pin2 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-316
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does FFC disconnected
CN701
or broken
from
Yes
No
Check pattern and S702
might be broken
Yes
Key
2
does not o
p
erate
Is there v
oltage of about 3.3V at pin
2
of
CN701
w
ithout
p
ressin
g
the ke
ys?
Check IC101
Yes
Check the potential voltage CN701
pin2 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-316
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does harness disconnected
CN701
or broken
from
Yes
No
Check pattern and S701
might be broken
Yes
Key
0
does not o
perate
No
No
No
No
CHECK IC101
button ->
Key
0
does not operate
POWER
Is there v
oltage of about 3.3V at pin
2
of
CN701
w
ithout
p
ressin
g
the ke
ys?
Yes
Check the potential voltage CN702
pin2 change from +3.3V to near 0V
when pressing the stop button.
Disconnected FFC or
FR-316
board
replace
Reconnect FFC, if symtoms
do not improve, replace
FFC
Does harness disconnected
CN701
or broken
from
Yes
No
Check pattern and S703
might be broken
Yes
Key
3
does not o
perate
No
Check IC101,
A23
No
Check IC101,
A22
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