Toshiba PORTEGE M400 - Manual (Page 88)

2 Troubleshooting 2.7 Keyboard Troubleshooting
2.7 Keyboard Troubleshooting
To determine if the computer’s keyboard is functioning properly, perform the following
procedures. Start with Procedure 1 and continue with the other procedures as instructed.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute the Keyboard Test in the Diagnostic Program. Refer to Chapter 3, Tests and
Diagnostics for more information on how to perform the test program.
If an error occurs, go to Procedure 2. If an error does not occur, the keyboard is functioning
properly.
Procedure 2 Connector Check and Replacement Check
The keyboard 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 connector CN3230 on the
System board.
If the connection is loose, reconnect the cable firmly and repeat Procedure 1. 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, Replacement Procedures. If the problem still exists,
perform Check 3.
Check 3 The System board may be damaged. Replace it with a new one following the
instructions in Chapter 4, Replacement Procedures.
2-40 [CONFIDENTIAL] PORTEGE M400 Maintenance Manual (960-541)