Toshiba Satellite U500 Maintenance Manual page 67

If the connection is loose, reconnect firmly. If there is still an error, go to Check 4.
Check 4 The touch pad or the touch pad cable may be damaged. Replace it with a new one
following the instructions in Chapter 4, Replacement Procedures. If the problem
still exists, perform Check 5.
Check 5 The main board may be damaged. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedures.
Satellite M500/M505/M507 Maintenance Manual [CONFIDENTIAL]
2 Troubleshooting Procedures
2-31