4 system board troubleshooting – Toshiba PORTEGE M400 User Manual
Page 64
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2 Troubleshooting
2.4 System board Troubleshooting
2-16
[CONFIDENTIAL]
PORTEGE M400 Maintenance Manual (960-541)
2.4 System board Troubleshooting
This section describes how to determine if the System board is defective. 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: Debug port (D port) Check on Boot Mode
Procedure 3: Diagnostic Test Program Execution Check
Procedure 4: Replacement Check
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