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Ethernet port turned off after few minutes

e14 Contributor

I am using 5V 1300mA adapter (http://www.skross.com/product/en/15/USB-Charger/56/World-USB-Charger.html) to power my Pi and another cheaper adapter that gives 5V 800mA.

 

The SD card is KINGSTON 16GB 100X SD10-HC.

 

I plugged in my Ethernet cable into the port and booted off Debian image from http://downloads.raspberrypi.org/images/debian/6/debian6-19-04-2012/debian6-19-04-2012.zip (SSH enabled). I am able to SSH into the Pi remotely and run basic commands, top, ps, ping. After about 15 minutes, the Ethernet LEDs just went off and my SSH session is gone too.

 

Checking the voltage at TP1 with my DMM it reads between 4.75 to 4.8V when the Ethernet is up and 4.9V when the Ethernet is down, i.e. the 3 LEDs marked FDX, LNK and 10M are off.

 

The same symptom is happening with both adapters. I have nothing else plugged into the Pi except the power and Ethernet cable.

 

Could this be another power problem? Anyone else seeing similar issue?

  • in reply to e14 Contributor

    I have just received a replacement unit from element14 to replace my older unit that had the Ethernet issue. It took 2 weeks for the replacement to arrive though but I have no complain there! :)

     

    The new unit appears to work normally for now.

  • in reply to e14 Contributor

    There has been mentioned on other Pi forums an issue with the LAN9512 IC that controls the USB and Ethernet. It is to do with intermittant operation of the 25MHz clock around the device. Seems if it's touched with a scope probe it may spark into life, it's possibly one of these things you can't pick up until you've built thousands of them.

     

    I have noted that some have added a stick on heatsink to the LAN7512 - but have had no report about if this does actually work.