BDP-BX510, BDP-S4100, BDP-S5100 - Sony DVD Service Manual (repair manual). Page 63

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BDP-S4100/BX510/S5100
6-11E
6-10. USB (Front) Device Flow/USB (Rear) Device Flowchart
USB device is not recognized
Insert the USB device again.
Is it recognized when the power is
turned OFF and then ON again?
No
Is 5V present at CN201
(FR-1002)
board
) pin1?
No
Is 5V present at
CN1002
(MB board) Pin 12 or pin 13?
No
Is 5V present at 
IC 6 01 pin1
(MB board)?
No
Power supply  IC310 (MB board -
defective
     Ye
         
s
Y
           
s
e
Yes
Poor contact of the USB device
Defective FFC between the IF
board and the MB board.
Does replacing IC601(MB board) 
improve the symptoms?
No
Replace the MB board
 Yes
 Yes
Replace the FFC between the
MB board and the IF board.
Do the symptoms improve?
No
Replace the MB board.
IC 601 (MB board) defective
  Yes
Defective FFC between the IF
board and the MB board
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