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Troubleshooting Procedures
Satellite U840
Maintenance Manual (960-Q08)
31
2.10 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 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 USB board. If LAN malfunctions, its connection is
defective or LAN cable, USB board and system board may be faulty.
Check 1
Make sure LAN cable is firmly connected to the USB Board connector CN1. 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
USB board may be faulty. Replace it with a new one. If the problem still occurs,
perform Check 4.
Check 4
system board may be faulty. Replace it with a new one following the instruction in
Chapter 4.
Summary of Contents for Satellite U840 Series
Page 1: ...Satellite U840 Maintenance Manual 960 Q08 Chapter 1 Hardware Overview ...
Page 18: ...Chapter 1 Hardware Overview Satellite U840 Maintenance Manual 960 Q08 15 ...
Page 24: ...2 1 Satellite U840 Maintenance Manual 960 Q08 Chapter 2 Troubleshooting Procedures ...
Page 190: ...Satellite U840 Maintenance Manual 960 Q08 Appendix B Appendix B Board Layout B 1 System Board ...