2.12 LAN Troubleshooting 2 Troubleshooting Procedures
2.12 LAN Troubleshooting To check if the computer’s LAN is malfunctioning or not, follow the troubleshooting
procedures below as instructed.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute LAN test in the LAN/Modem/Bluetooth/IEEE1394 test program. Refer to Chapter 3
Tests and Diagnostics for more information on how to perform the test program.
If any error is detected by the test, go to Procedure 2.
Procedure 2 Connector Check and Replacement Check
The LAN function is embedded on system board. If LAN malfunctions, its connection is
defective or LAN cable and system board may be faulty.
Check 1 Make sure LAN cable is firmly connected to LAN jack. If the problem still
occurs, perform Check 2.
Check 2 LAN cable may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 3.
Check 3 Make sure LAN harness is firmly connected to the connector CN4100. If the
problem still occurs, perform Check 4.
Check 4 LAN harness may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 5.
Check 5 System board may be faulty. Replace it with a new one following the instruction
in Chapter 4.
2-48 PORTEGE M300 Maintenance Manual (960-504)