I am using 5V 1300mA adapter (http://www.skross.com/product/.....arger.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.o.....4-2012.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?
Re: Ethernet port turned off after few minutes
Try an other power cable. I have made the experience that some cables have too much resistance and are lowering the voltage. On the same power supply one gave me 4.90V and the other 4.66V.
Re: Ethernet port turned off after few minutes
Similar results here. Same spec card, but 8G and 4G versions tried, 700mA Samsung adapter and 1000mAh "generic" adapter, but either of these get similar results - unit powers up, can startx and maybe even load a program, but after a couple of minutes, ethernet lights go out, unable to ping/ssh/telnet, and just have the red power led.
Also same results without x, just leaving at login prompt. after couple of minutes, lights out. Kids are starting to lose interest in pi, not the start I was wanting for them.
Suggestions for possible log files to see if anything is logged?
Also same results without x, just leaving at login prompt. after couple of minutes, lights out. Kids are starting to lose interest in pi, not the start I was wanting for them.
Suggestions for possible log files to see if anything is logged?
Re: Ethernet port turned off after few minutes
My /var/log/messages looks clean. What is your best (highest) voltage reading at TP1 when the Ethernet was on?
I have contacted element14 tech team to help diagnose this instead and am still waiting from their response. I am starting to believe it could be either bad soldering or faulty Ethernet hardware.
BTW, the Ethernet jack is labeled HanRun HR901110A and the datasheet was linked to in another post here http://www.raspberrypi.org/phpBB3/viewt ... 466#p77466
I have contacted element14 tech team to help diagnose this instead and am still waiting from their response. I am starting to believe it could be either bad soldering or faulty Ethernet hardware.
BTW, the Ethernet jack is labeled HanRun HR901110A and the datasheet was linked to in another post here http://www.raspberrypi.org/phpBB3/viewt ... 466#p77466
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johnbeetem
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Re: Ethernet port turned off after few minutes
This is just a SWAG (Scientific Wild-A**ed Guess) based on my limited experience with polymer fuses. From what I've read, the resistance of a polyfuse such as F3 increases with heat, so when RasPi is drawing more current, the 5V to 3.3V regulator RG2 gets hotter and makes that part of the board hotter since it has good heat conduction to the PC board. This increases F3's resistance to the point where the +5V0 measured between TP1 and TP2 gets low enough that the LAN9512 gets disabled, perhaps by software.
My other SWAG is that perhaps there's "sweet spot" for +5V0. If +5V0 is too low LAN9512 doesn't come come up at all. If +5V0 is too high then RG2 gets hotter which increases F3 resistance and LAN9512 stops when +5V0 gets lower.
I don't have a RasPi yet, but if this happens to me I'll monitor those voltages carefully and see if I can confirm or refute my guess. Then I may either replace F3 with a real SMT fuse (the low-resistance kind that must be replaced if it blows) or if I have enough confidence in my 5V power supply's built-in current limiting I'll just bypass F3. This is not recommended unless you really know what you're doing and you know how your 5V supply's circuitry works, and it will void your RasPi warranty. I also might try replacing RG2 with a 3.3V switcher just for the fun of it. That way people can look at my set-up and say "cool board" and I can reply "yes, it is!"
My other SWAG is that perhaps there's "sweet spot" for +5V0. If +5V0 is too low LAN9512 doesn't come come up at all. If +5V0 is too high then RG2 gets hotter which increases F3 resistance and LAN9512 stops when +5V0 gets lower.
I don't have a RasPi yet, but if this happens to me I'll monitor those voltages carefully and see if I can confirm or refute my guess. Then I may either replace F3 with a real SMT fuse (the low-resistance kind that must be replaced if it blows) or if I have enough confidence in my 5V power supply's built-in current limiting I'll just bypass F3. This is not recommended unless you really know what you're doing and you know how your 5V supply's circuitry works, and it will void your RasPi warranty. I also might try replacing RG2 with a 3.3V switcher just for the fun of it. That way people can look at my set-up and say "cool board" and I can reply "yes, it is!"
Re: Ethernet port turned off after few minutes
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.
The new unit appears to work normally for now.
Re: Ethernet port turned off after few minutes
Farnell are being really massively helpful with returns in my experience. I had to return my unit, got my new one, and it works flawlessly so far. I really can't thank Farnell enough for listening and responding very efficiently. Thank you specifically to Adam in the returns department for keeping me informed along the way, calling me several times at home and on my mobile to let me know how things were going.