I have seen this before. The USB path and 5VDC paths are different through the PMIC. It is possible that the PMIC has sustained some damage or it could be the 5VDC power supply is not powering up properly, where it has a voltage spike, causing the PMIC to shutdown.
Past performance of power supplies is no guarantee of future performance. It could be right on the edge. Gerald On Wed, Feb 25, 2015 at 10:27 AM, <[email protected]> wrote: > Identical problem this morning: BBB boots fine when powered by USB, but > not when powered by a 2.0 mA rated 5.0 V DC power supply (nicked from some > other device). BBB power LED blinks continuously. This power supply has > worked with this BBB in the past. > > Mike. > > > On Friday, January 23, 2015 at 8:44:59 PM UTC-8, [email protected] wrote: >> >> I had a similar problem- my power LED would just continue blinking when >> connected to a 5V power source. This meant there was something wrong. >> First, I checked if my BBB was still alive. To find that, I connected my >> board to a computer via USB. Surprisingly, this time power LED turned on >> normally. Then to make sure that everything was properly, I ran some >> program as given in the BB website http://beagleboard.org/getting-started. >> I was happy to see, the programs on the website worked just fine on my >> board. Thus, I was able to conclude that strangely, my BBB board didn't >> like 5V external power source! >> >> On Friday, November 22, 2013 at 6:41:41 AM UTC-8, Bert Lindner wrote: >>> >>> >>> Just had a 5V powered Beaglebone Black seemingly die on me. First the >>> power led kept blinking, then after removing the (BB Toys CAN) cape the >>> power led would flash just once after applying power. Looking back in >>> previous threads this seemed to mean I killed the board somehow; there was >>> also a GPS module attached to one of the UARTs and a probably power hungry >>> USB wlan stick that I'm trying to get to work, so a power hungry setup. >>> >>> I was ready to declare it dead, it remained just flashing once after >>> repeatedly unplugging and reattaching the power supply. >>> >>> However I noticed the single power led flash would also happen if I >>> pressed the power button (leaving the 5V plug in). Doing that repeatedly >>> seems to have revived the board, will see if new problems occur. For now it >>> behaves normally. >>> >>> Is this expected behaviour? >>> >>> Best, >>> >>> -Bert >>> >>> -- > 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. > -- Gerald [email protected] http://beagleboard.org/ http://circuitco.com/support/ -- 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.
