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If the LAN port malfunctions, there may be a bad connection between the RJ-45 jack and the 
system board.  Or the system board may be damaged. 

Disassemble the computer following the steps described in Chapter 4, Replacement Procedures 
and perform the following checks: 

Check 1  Make sure the RJ-45 jack cable is firmly connected to PJ4100 on system board. 

 

 

 

 

                  If a 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 

following the steps in Chapter 4, Replacement Procedures.  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.