Toshiba A20-S259 - Satellite - Pentium 4 2.66 GHz Maintenance Manual page 100

2 Troubleshooting Procedures
Procedure 2 Connector Check and Replacement Check
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 ma y be defective or damaged. Replace the system board with a
new one following the steps in Chapter 4, Replacement Procedures.
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2.11 LAN Troubleshooting
Satellite A20 Maintenance Manual (960-444)