The one time flash means that the Power Management Integrated Circuit (PMIC) saw something about your power that it did not like and went into self-protect.
The 5 V power for the BBB must remain between 4.5 and 5.5 Volts at all times. even a transition out of that range for a millisecond or so will trip the self protect. There are also some rise-time requiremetns when the power is turned on. It is best to stay between 4.75 and 5.25, so that you have some margin, against the self-protect points. Put an oscilloscope on your 5V power and figure out what is happening. --- Graham == On Tuesday, November 7, 2017 at 12:41:47 PM UTC-6, Pekka R wrote: > > > Hello. > > With 5V power, BBB not starting normally, only power led flashes 1 time. > And if i connect USB without 5V PSU it starting up. > Is there something broken or what? > -- 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/2d441194-8214-4fe8-86b3-a5a098f35a2b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
