Gerald: I have 2 BBBs that will give a single brief flash of the power LED when the power button is pushed, as described by others. It will not sustain the power LED on nor boot up. When I power it from the barrel connector (Adafruit regulated 5v power source / AC to DC 5v 2A) while on a digital volt / ammeter, no current flow registers at all during the brief flash of the power LED. The voltage reads 5.08 volts. I cannot see that this is due to either an unregulated power source (also happens on USB power on 2 PCs by the way). Nor does it look like excessive current draw. Other ideas?
On Thursday, June 11, 2015 at 9:08:39 PM UTC-4, Gerald wrote: > > The flashing LED indicates excess current is being drawn by the processor. > This can be related to damaged I/O pins or power supplies that are not well > regulated.. > > Gerald > > > On Thu, Jun 11, 2015 at 4:38 PM, <[email protected] <javascript:>> wrote: > >> I have the same issue, already 3 boards has died. >> any solution, i tried to use optoisolator/pwm and noting. the BBB is a >> bad board. >> >> >> >> Le mercredi 25 février 2015 18:03:24 UTC+1, [email protected] a écrit : >>> >>> 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] <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.
