Are you measuring the power supply voltage with the BBB connected? You need to 
load the power supply to measure the output voltage. 

Regards,
John




> On Jul 15, 2016, at 10:22 AM, [email protected] wrote:
> 
> first of all thank you for your reply..
> 
> If you could suggest me though something more specific (i.e what voltage 
> should i test?) i would appreciate it..
> Now, what i noticed has really driven me crazy...
> Since i have the bb RevA6, i checked in the system reference manual 
> (http://beagleboard.org/static/beaglebone/latest/Docs/Hardware/BONE_SRM.pdf 
> <http://beagleboard.org/static/beaglebone/latest/Docs/Hardware/BONE_SRM.pdf>) 
> that power can be supplied via a 2.1mm x 5.5mm center connector when 
> connected to a positive power supply rated at 5VDC +/- .1V and 1A.
> So i used a power adaptor with nominal voltage output 5V which though, as i 
> found out later by using a volt meter, it actually provided 5.26V...and 
> miraculously the beaglebone power led turned on and the board was 
> working...If i am not mistaken i accidentally exceeded the voltage limits 
> (not the current though) and it worked..
> Now the question is..what is the actual functional power supply for the bb 
> white?
> 
> 
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