Power (System) Flow - Sony BDP-S485 Service Manual

Power (System) Flow

AC IN
Check the output voltages from the power
supply block.
CN301 pin 1: +12V (UNSW12V) No
CN301 pin 2: +12V (UNSW12V)
CN301 pin 3: +12V (FE_UNSW12V)
-
-
Yes
Check the fuses
No
Have any of the below fuses blown?
MB board: PS301, PS302
PS1201
-
Yes
Check the following power control signals
while the power is ON
No
PCONT_CORE: MB board R327
PCONT2: MB board R1236
PCONT3: MB board
R305,R307,R309,R343
ATA_PCONT: MB board R376
Yes
Check the voltages based on the schematic
No
diagram
Check that the harness has been inserted
properly. If there is no problem, replace the
power supply block.
Replace blown fuses
Replace the MB board if there is no
improvement
To IFcon section Flow
Voltage lines that are not output are shorted
No
to GND
Failure of power supply IC -> Replace the IC
Replace the MB board if there is no improvement