I am currently making a project with the stm32f3discovery board and am ready to move it away from the computer and onto an external power source. I have a 5v ubec connected to a lipo battery and am getting about 5.2v from the ubec, when plugging it into the 5v pin it all turns on and runs fine but then after a few days the board started to not run and then got to the point where I can't even flash code to it anymore. Is this the fact that it's 5.2v and not 5v or is there something else going on here that i'm not aware about.
There doesn't seem to be anything online about how to power it from an external source except from in the user manual but it doesn't say how close to 5v it has to be.
Also what are the white circles for next to the 5v and 3v pins?
Any help will be much appreciated, thank you.