Sony BDP-S186 - Page 95

USB (Front) Device Flow
USB device is not reco
g
nized
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-316)
board
) pin1?
No Is 5V present at
CN1002
(MB board) Pin 12 or pin 13?
No
Is 5V present at C601 pin1
(MB board)?
No
Power supply IC310 (MB board -
defective
Yes Yes Yes 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
Replace the FFC between th
e
MB board and the IF board.
Do the symptoms improve?
No Replace the MB board. IC601 (MB board) defective
Yes
Defective FFC between the IF board and the MB board
9-11E
BDP-BX18/S185/S186