Toshiba PROL450D Manual Do Utilizador

Satellite L450D/455D, Satellite pro L450D Series Maintenance Manual 

 

 

                                                                       

18

 

To determine if the computer’s keyboard is functioning properly, perform the following 
procedures. Figure 2-4 outlines the process. Start with Procedure 1 and continue with the 
other procedures as instructed. 

Procedure 1:  External keyboard check 
Procedure 2:  Diagnostic check 
Procedure 3:  Connector and replacement check 

Connect a USB keyboard to one of the computer’s USB ports, and then boot the computer. 
The computer automatically detects the external keyboard. 

If the external keyboard works correctly, the internal keyboard or its connections may be 
faulty.  Go to Procedure 2. 

If the external keyboard appears to have the same problem as the internal keyboard, the 
system board may be having some problem.  Replace it with a new one and following the 
instructions in Chapter 4. 

Run the 

test and Diagnostics

 Program, which will automatically execute the Keyboard Test.  

Refer to Chapter 3, 

Tests and Diagnostics 

for more information on how to run the program. 

If an error is located, go to Procedure 3.  If an error does not occur, the keyboard is 
functioning ok. 

The keyboard and/or system board may be disconnected or damaged.  Disassemble the 
computer following the steps described in Chapter 4, Replacement Procedures and perform 
the following checks. 

Check 1 

Make sure the keyboard cable is firmly connected to the system board.  
If the connection is loose, reconnect firmly and repeat Procedure 2. If there is still 
an error, go to Check 2. 

Check 2 

The keyboard may be damaged. Replace it with a new one following the 
instructions in Chapter 4. 
If the problem still exists, perform Check 3.