BDP-BX120, BDP-BX320, BDP-BX520, BDP-S1200, BDP-S3200, BDP-S4200, BDP-S5200 - Sony DVD Service Manual (repair manual). Page 40

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6-3
BDP-S1200/BX120/S3200/BX320/S4200/S5200/BX520
6-2. Power (System) Flow
AC IN
Check the output voltages from the power 
supply
AC Adapter Output Jack : 12V
 block.
No
Yes
Check the fuses
Have any of the below fuses blown?
MB board: PS201 
No
Check the following power control signals
while the power is ON
PCONT1#
: MB board
R252, R205,R243,R288
Yes
Check Voltage lines that are not output are  
shorted to GND
No
Failure of power supply IC ->
Replace the MB board.
Replace AC adapter.
 Blown fuses --> Replace the MB board
Yes
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