If the BBB will run from USB power, then the BBB is probably OK. Put an oscilloscope on the output of the power supply that is causing the problem, and watch what the voltage does when you turn things on.
I had a bench power supply (B&W 1550) that when set to 5 Volts, then the output turned on, would throw a transient up to 6 Volts then return to 5 Volts. (The bigger the capacitor across the load, the greater the transient.) This would trip the over-voltage detect in the BBB power supply, which would blink the power LED once, then off after that. So, make sure the power supply is working properly. Some of the cheap power supplies out there will NOT run a BBB. --- Graham == On Thursday, June 18, 2015 at 7:27:54 PM UTC-5, Gerald wrote: > > Sounds like an overvoltage condition on the 5V DC input may have damaged > the DC input. Usually from a cheap 5V power supply. If the USB power works, > then the rest of the board is OK. > > Gerald > > > On Thu, Jun 18, 2015 at 11:17 AM, <[email protected] <javascript:>> > wrote: > >> Hi, my Beaglebone Black have the same behavior, gives a short blink at >> the power LED when powered. >> But, I turned on via usb connector with power supply 5V@1A. What may have >> happened? >> >> >> Em sexta-feira, 16 de agosto de 2013 13:44:09 UTC-3, magu_ escreveu: >>> >>> Hi >>> >>> I powered the BBB over the DGND - VDD_5V. But by accident I plugged it >>> into PWR_BUT. >>> >>> Now it only gives a short blink at the power LED when powered. I know >>> this is a bad sign... But does anybody of you know if this does not mean >>> the end of it and if it can be somehow reset? >>> >>> yours >>> magu_ >>> >> -- >> 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] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > Gerald > > [email protected] <javascript:> > http://beagleboard.org/ > -- 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]. For more options, visit https://groups.google.com/d/optout.
