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2 Troubleshooting Procedures
2.11 LAN Troubleshooting
This section describes how to determine if the computer’s LAN is functioning properly.
Perform the steps below starting with Procedure 1 and continue with the other procedures as
required.
Procedure 1: Diagnostic Test Program Execution Check
Procedure 2: Connector Check and Replacement Check
Procedure 1 Diagnostic Test Program Execution Check
Execute the LAN test program available as part of 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 RJ-45 jack with LAN cable is connected to the system board. If the LAN malfunctions,
the system board might be damaged.
Disassemble the computer following the steps described in Chapter 4, Replacement
Procedures and perform the following check:
Check 1 Make sure the RJ-45 jack is firmly connected to J4100 on the system board.
If the connector is disconnected, connect it firmly and repeat Procedure 1. If the
LAN port is still not functioning properly, perform Check 2.
Check 2 The RJ-45 jack may be defective or damaged. Replace the RJ-45 jack with a new
one. If the LAN port is still not functioning properly, perform Check 3.
Check 3 The system board may be defective or damaged. Replace the system board with a
new one following the steps in Chapter 4, Replacement Procedures.
PORTEGE M700/M750 Maintenance Manual (960-661) [CONFIDENTIAL] 2-45