The single blink means that the Power Management Chip is going into self protect.
You need to put a scope on the output of your regulator and see what is going on. 5.3 V will not fry the BBB. It would run fine from a 5.3 V supply that never went above 5.5V But it will respond the way you describe to short transients that go above 5.5 or below 4.5. There is also a rise time spec on the start up Voltage rise. Or, it could mean that something else did fry the board, such as a blown I/O pin, which is causing an over current protect on the part of the power management chip. The single blink does not tell you what is wrong, just that something is wrong, and the power management chip is still alive and doing its job. --- Graham == On Wednesday, April 24, 2019 at 3:31:04 PM UTC-5, robpar...@gmail.com wrote: > > Hi There, > > I have been working on a project using a beaglebone black which I am > trying to power with a 3-cell LiPo battery. To do this, I have connected > the output of a hobbywing ubec 5V-3A voltage regulator to pins P9_5 and 6. > This seemed to work well for a while, but just now the BBB abruptly turned > off and will not turn back on. I have tried disconnecting everything from > the BBB and connecting it to my PC with the USB cable. This results in a > quick, faint flash of the PWR led followed by nothing. Pressing the power > button with the USB cable plugged in yields the same behavior. I just > tested the voltage regulator output and my voltmeter reads 5.3 V. My > understanding is that the BBB requires a well regulated 5 +- 0.25 V power > input. So technically my power supply is 50 mV above the limit. Is it > possible that I have fried the board by doing this? Is there any way to > recover it without buying a whole new BBB? Thanks in advance for your help! > > > -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/81160246-a5a0-4885-9d85-3b8fcae57630%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
