Sony BDP-BX18 / BDP-S185 / BDP-S186 (serv.man2) Service Manual ▷ View online
BDP-BX18/S185/S186
9-2
Main Flowchart
o
N
o
N
se
Y
se
Y
No
Yes
Yes
No
Yes
No
No
No
se
Y
se
Y
se
Y
No
se
Y
se
Y
No
Yes
No
No
Yes
Yes
No
Yes
Power ON by power switch on front or remote control.
Has system reset (CPU_XRST) been cancelled? Measurement point JL1018
To Video 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-BX18/S185/S186
9-3
Pow
er
(Sy
st
em)
Flow
AC
IN
C
heck
the
output
v
olt
ages
fro
m
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
Ch
eck
the
fu
se
s
H
av
e
any
o
f t
he
below
fu
se
s
blow
n?
No
M
B
board:
PS301,
PS302
Yes
Ch
eck
the
follow
ing
pow
er
cont
rol
signal
s
while
the
pow
er
is
ON
PCONT1#
: M
B
board
R
396, R398,R390
Yes
C
he
ck
th
e
volt
ages
based
on
th
e
sche
m
at
ic
diagram
No
Volt
age
lines
that
are
not
out
put
are
shorted
to
G
N
D
No
Failure
of
pow
er
supply
IC
->
R
eplac
e
the
IC
R
eplac
e
the
MB
board
if
there
is
no improvement
C
hec
k
that
the
harness
has
been
ins
ert
ed
properly.
If
there
is
no
problem
, replac
e
th
e
pow
er
supply
block
.
Re
plac
e bl
ow
n fu
se
s
Replace the MB b
oard if the
re
is no
improve
me
nt
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
ain
flow
char
t
Yes
Is
the
dri
ve oper
at
ing
prop
erl
y?
No
To Dri
ve
flow
chart
Yes
Is ea
ch pow
er
suppl
y supp
lied t
o t
he AUDIO
Bl
ock?
No
To Pow
er Suppl
y (
System
) f
low
chart
Yes
Onl
y A
na
log 2ch L/R Audi
o aff
ec
ted?
No
Onl
y Di
gital
Audi
o (
HD
MI
, Coax
)
affected?
No
Repl
ace t
he M
B board
Yes
Yes
Is
there
HDM
I output
?
No
Rep
lace
the
M
B
board
Is there Coax
ialo
utput?
Is ther
e aud
io
sy
stem
di
gital
si
gnal
input to
IC901? IC901
pin1:
A
LO_R
IC901
pin10:ARO_R
No
Repl
ace the M
B board
Yes
Are control
si
gnal
s i
nput to IC901?
IC901pin7: MUTE
No
Repl
ace the M
B board
Yes
Is t
her
e a pro
ble
m
wi
th m
ount
cond
ition of
IC901
No
Repl
ace I
C901 or repl
ace
M
B boar
d
Check output resistor/capasitors (R943,R945,C928,C931,C932)
No
IC 302 Pin 7: SW3.3V
BDP-BX18/S185/S186
9-5
Vi
deo
secti
on
flo
wch
art
Repr
oduced vi
deo do
es
not
ap
pear
ri
gh
t
Is
the
FL
di
sp
la
y/LED
di
sp
la
y
cor
re
ct?
No
To
M
ai
n
flow
char
t
Is the drive o
p
erating pro
perly?
No
To
Drive
flowc
har
t
Check
the
in
put
po
wer
No
IC1
01
pin D16 & E16 : +3.3V
Is
a
video
signal
out
put
fr
om
IC
10
1
?
No
Check the writing from IC101
Is a si
gnal
o
utp
ut
from
ea
ch
Vi
de
o
output
connector
?
No
Che
ck
out
put
inductors (L705)
To
Power
(System)
f
low
char
t
Pi
n B18 : VDACX_OUT
IC
101
pin
D12
: +3.3V
Ch
ec
k
ou
tput
resistors (R709/C709)
Yes
Yes
Yes
Yes
Yes
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