Chapter2 Troubleshooting Procedures
Satellite U400/Satellite Pro U400/PORTEGE M800
Maintenance Manual 2-13
2.4 System Board Troubleshooting
This section describes how to determine whether the system board is malfunctioning or not.
Start with Procedure 1 and continue with the other procedures as instructed. The procedures
described in this section are:
Procedure 1: Message Check
Procedure 2: Debugging Port Check
Procedure 3: Diagnostic Test Program Execution Check
Procedure 4: Replacement Check
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