Ifcon Section Flow Chart (1/2) - Sony BDP-S485 Service Manual

IFcon Section Flow Chart(1/2)
IF Con block power supply check
No
UNSW3.3V voltage (+3.3V) Input voltage
Is 3.3V output from IC301 pin4? Is +3.8V input to IC301 pin5?
Yes
REG control voltage
Is +3.8V input to IC301 pin1?
Replace IC301
P_FAIL detection operation check
Replace
Check the P_FAIL voltage
IC1204 pin1
No
If symptoms do not improve, replace
Is +3.3V output from IC1204 pin2?
(P_FAIL detection)
Yes
Is there voltage of about 3.3V at pin 21,22
Main unit key check
No
and 23 of CN1204 and pin 1 of CN1206
Check of key voltage from main unit Key
without pressing the keys?
Table (*) when key is pressed or not pressed
POWER: CN1203 pin1(JL1269) KEY0
Is there a problem with the mounting
STOP: CN1204 pin21(JL1233) KEY1
condition of RB1201,RB1202,C1213,C1214,
OPEN/CLOSE: CN1204 pin22(JL1232) KEY2
C1215 and C1216?
PLAY: CN1204 pin23(JL1231)
KEY3
Replace RB1201,RB1202,C1213,C1214,
Yes
C1215 and C1216. If the symptoms do not
improve, replace IC1203 or MB board
Remote control operation check
Check the waveform when the remote Check whether the FFC is disconnected
control button is not pressed from CN1204. (Other than the POWER key)
No
Check of the 3.3V voltage
CN1204 pin19 and IC1203 pin31
Yes
Check of the waveform when the key is
pressed
Is the remote control that is used in the
No
In comparison with a normal waveform, is
inspection broken?
the waveform of the voltage output
tl ?
Check whether the FFC is disconnected
Yes
from CN1204.
A
No
DCDC4V voltage (+3.8V)
Is 3.8V output from IC302 pin 3?
Yes
Replace IC301
If symptoms do not improve, check for a
short on the circuit board
No
Replace R304
If the symtoms, replace IC301
Yes
R1264 and check for +3.3V at
If the FFC from CN1204
No
disconnected?
IC1204
(other than POWER KEY)?
Is the harness from CN1203
disconnected?
(POWER KEY)
Yes
Yes
No
Does replacement of the
No
improvement?
To
* Key Table
Input
(KEY0)
Key_OFF
2.90 -
0.00 - POWER
No
Input voltage
Is +11.8V input to IC302 pin2?
Yes
o
N EN control voltage
Is +11.8V input to IC302 pin2?
Yes
Replace IC302
Does replacement
No
No
of the IF board result in
improvement?
Yes
To IF board Flow
IF board result in
No
Yes
B
IF board Flow
(KEY1) (KEY2) (KEY3)
Key_OFF Key_OFF Key_OFF
STOP OPEN/CLOSE PLAY
No
No
Is the fuse (PS301) blown?
Yes
Replace PS301
if the symptoms do not improve,check for
a short on the circuit
No
Replace R302
If the symtoms do not improve, replace IC302
To
Power Supply (System)