Micael, For good measure, you should be aware that pins that are connected to external hardware. Should be isolated if those pins, and hardware are powered up before the beaglebone. I would think that if the beaglebone it's self is powering these external circuits, and hardware. Then this would be less of a problem.
Additionally, I've had more than one beaglebone come across my "desk" in the last 4 or so years. One in particular is possibly form the first batch sold to the public. e.g. ~4 years old. I have heard people saying that if you pull the power, while the board is running, that the processor can be damaged from this action. I'm not saying to is false, I am just saying that it would probably be a fairly rare issue. As I've been in a situation where I've had to do exactly that, many times. As far as corrupting the operating system. It is possible, as with any operating system. But again, it's a fairly rare situation. You're just as likely to corrupt the system by installing an application, updating the system, or flashing an new image to the eMMC. So there is one thing I have not seen you mention if you've attempted this or not. Sometimes, the board needs to have the reset button pressed, before it will power up again. I've run into this a few times myself, and like you I was nearly convinced the board was dead. No power lights coming on. even after completely disconnecting the input power several times. I also power my own personal beaglebones the same way you do. Via USB. Anyway, I'm not saying this will fix your problem. but it is worth looking into. If in doubt which button is reset, it probably would not hurt for you to just press both of the button to the right of the ethernet jack, with ethernet jack oriented at the top of the board. Anyway, if you care for a much better "analysis" of what happened, and how to avoid the same in the future. It would behoove you to tell us exactly how many pins you had connected to your external hardware. What kind of periphery, and how much current source/sink + voltage levels. As the beaglebone is only 3.3v tolerant, and the ADC pins have a max tolerance of 1.8v. On Sun, Feb 5, 2017 at 6:38 PM, William Hermans <[email protected]> wrote: > Or as Gerald already eluded to in his first post. Voltage levels on the > GPIO's, or other periphery was too high. > > On Sun, Feb 5, 2017 at 5:18 PM, Dennis Lee Bieber <[email protected]> > wrote: > >> On Sun, 5 Feb 2017 07:55:47 -0800 (PST), >> [email protected] declaimed the following: >> >> >It doesn't flashes, no light at all.. during operation it went down. The >> BeagleBoard doesn't show up any longer as a hard drive. I connect via the >> micro USB port, and that is the only power source for the board. >> >> If the unit is driving any other hardware, I'd be concerned about >> the >> power supply... USB is normally only rated for 5V 500mA max (normally that >> 500mA is distributed among up to four sockets of a hub). >> >> However... "during operation it went down" is too vague to really >> comment upon... Failure points could be the USB to PMIC, the PMIC itself, >> or something later. A short between almost anything could draw more power >> than the USB could provide. >> >> Also, if that unit is running normal Linux (rather than a totally >> custom embedded application), then shutdown should NEVER be done by just >> pulling the power... Pulling power could lead to a corrupt file system >> (though a corrupt file system won't affect the power LED, and maybe not >> even the status LEDs. >> -- >> Wulfraed Dennis Lee Bieber AF6VN >> [email protected] HTTP://wlfraed.home.netcom.com/ >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit https://groups.google.com/d/ms >> gid/beagleboard/2sff9c9cnbgt4amu00s1j4r8bdtghojqsb%404ax.com. >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORqCRPPUYnWJRwhR6495AG1x%3DpFDPiPT%2BMXEfYfYmycvEw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
