user manual

2 Troubleshooting Procedures
Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual
19
Check 3 The system board may be damaged. Replace it with a new one following the
instructions in Chapter 4.
2.6 External USB Devices Troubleshooting
Replace system board
(Procedure 2)
END
Original USB
dev ice is fau lty
Perform external device and
connection check
(Procedure 1)
START
D oes the device function
w hen connected to a
different U S B port?
D oes an alternative U S B
device function correctly?
No
Yes
No
Check USB
port
con nectio n
Yes
Figure 2-5 External USB device troubleshooting process