Toshiba A1 User Manual

To check if the computer’s LAN is defective or malfunctioning, follow the troubleshooting 
procedures below as instructed. 

Procedure 1 Diagnostic Test Program Execution Check 
Procedure 2 Connector Check and Replacement Check 

Execute the LAN Test in the Diagnostic Program. (Sound/LAN/Modem test Program subtest 
03 LAN test) 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 

The LAN function is mounted on the system board. The modem/LAN jack is connected to the 
system board by the cable. If the LAN malfunctions, the connection is bad or the system board 
might be faulty. 

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

Check 1  Check if the LAN jack is connected firmly to the connector PJ4100 on the system 

board. 

  

PJ4100    System Board

 

If it is loose or disconnected, connect it firmly and return to Procedure 1. If there 
is still an error, perform Check 2. 

Check 2  The LAN jack may be defective. Replace the LAN jack with a new one. If the 

problem persist, perform Check 3. 

Check 3  The system board may be faulty. Disassemble the computer following the steps 

described in Chapter 4.