Sony UBP-X800 Service Manual page 58

6-12. USB (Front) Device Flow
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 board)
pin1?
No
Is 5V present at CN705 (MB
board) Pin8 or Pin9?
Yes
Defective FFC between the IF
board and the MB board.
Yes
Poor contact of the USB device.
If USB connector damage replace FR board.
Replace the FFC between the
Yes
MB board and the IF board.
Do the sym ptoms improve?
Yes
Defective FFC between the IF
board and the MB board
No
Replace the MB board
No Replace the MB board.
6-9