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STM32F407G Discovery version D1 start-up failure using external power

Question asked by stander.riaan on Mar 11, 2016
Latest reply on Mar 12, 2016 by stander.riaan
Hi All,

I have two STM32F407 discovery boards. A version B2 board and a new version D1 board.

The B1 starts on external power just fine with the same code but the D1 board does not. It only starts up after I connect it to a USB port while connected to the external power supply.

The external power comes from at computer power supply giving it 5.01V while the USB power comes from my Windows 7 Desktop. I think it gives it 4.97V.

Any idea what causes this weird start-up failure?