Usb Troubleshooting; Procedure 1 Diagnostic Test Program Execution Check; Procedure 2 Connect Check And Replacement Check - Toshiba Satellite L640D Maintenance Manual

Chapter 2 Troubleshooting Procedures
2.19 USB Board Troubleshooting
Flatiron carries 3 USB port. To check if the computer's USB port is malfunctioning or not,
follow the troubleshooting procedures below as instructed.
Procedure 1:
Procedure 2:
Procedure 1 Diagnostic Test Program Execution Check
Execute USB test in the USB test program.
If any error is detected by the test, go to Procedure 2.
Procedure 2 Connect Check and Replacement Check
Right side USB port is connected to system board with CRT Board by CRT cable. This cable
may be disconnected from system board. Disassemble the computer following the steps
described in Chapter 4, Replacement Procedures.
Check 1 Make sure CRT cable is correctly and firmly inserted. If the problem still occurs,
perform Check 2.
Check 2 CRT/B may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Check 3 The system board may be faulty. Replace it with a new one following the
instruction in Chapter 4.
Satellite L600D/L640D/L645D, Satellite Pro L600D/Pro L640D/Pro L645D Maintenance Manual (960-Q08)
Diagnostic Test Program Execution Check
Connect Check and Replacement Check