6-9
6-12. USB (Front) Device Flow
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?
No
Yes
Yes
Yes
Defective FFC between the IF
board and the MB board.
Replace the MB board
Replace the FFC between the
MB board and the IF board.
Do the symptoms improve?
No Replace the MB board.
Yes
Defective FFC between the IF
board and the MB board
Poor contact of the USB device.
If USB connector damage replace FR board.
USB device is not recognized
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