I have a Due D00047562 that I am having problems with. Occasionally it makes a high pitched squealing noise and the supply voltages and analogue readings become erratic. The squealing seems to come from what looks like an inductor nears pins 40-42. I’m guessing this is some kind of switch mode regulator’s transformer or inductor.
The minimum setup for this seems to be with an AdaFruit 1947 display attached (which draws <100mA), however it has also happened with a blue tooth module and a few LED’s – again around the 100mA mark. Quite often the thing will run fine for hours on end but then suddenly start playing up if it is reset or reprogrammed.
This occurs intermittently and happens when powered by USB and by 12Vdc external supply. Once it starts the only way to correct the problem is to power down completely.
Is this a common problem or does it sound like a fault with the board?