Usb (Front) Device Flow - Sony BDP-S1100 Service Manual

6-10. USB (Front) Device Flow

USB device is not recognized
No
Insert the USB device again.
Is 5V present at
Is it recognized when the power is
board) pin1?
turned OFF and then ON again?
Ye s
Poor contact of the USB device
Replace the FFC between the
MB board and the IF board.
Do the symptoms improve?
Defective FFC between the IF
board and the MB board
CN201(FR-1001)
No Is 5V present at CN303
(MB board) Pin 10 or pin 11?
Y s e Y e s
Defective FFC between the IF
board and the MB board.
No Replace the MB board .
Yes
Is 5V present at IC370 pin1
No No
(MB board)?
Yes
Does replacing IC370(MB board)
No
improve the symptoms?
Yes
IC370 ( MB board) defective
6-11 E
BDP-S1100/BX110/S3100/BX310
Power supply IC370 (MB board -
defective
Replace the MB board