IF
co
n S
ec
ti
o
n F
lo
w
C
h
ar
t(
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
in
spect
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
