Toshiba Satellite U900 Maintenance Manual page 76

Troubleshooting Procedures
To determine if the computer's LAN port is functioning properly, perform the following
procedures. Figure 2-18 outlines the process. Start with Procedure 1 and continue as
instructed.
Procedure 1: Diagnostic check
Procedure 2: Connector and replacement check
Procedure 1 Diagnostic check
test and Diagnostics
Run the
Tests and Diagnostics
Refer to Chapter 3,
If an error is located, go to Procedure 2. If an error does not occur, the LAN is functioning
ok.
Procedure 2 Connector and replacement check
The LAN cable 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 LAN cable is firmly connected to the LAN port of 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 LAN cable may be damaged. Replace it with a new one and repeat Procedure
2. 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.
Satellite U900/U940/U945 Series Maintenance Manual
Program, which will automatically execute the LAN Test.
for more information on how to run the program.
43