I have started to used board STM32-H107.
Looking at the various ways to supply the board I noticed that it is powered through USB even if the selection pin is connected to receive external supply.
Even better : when the jumper is removed (so no supply selection done) it is still supplied through USB !
I have looked closely the schematic but do not see what happens. Does someone knows ?
This behavior, while not correct, should not cause any problems. The operation of ST2052BD does not follow the standards and it causes such a misbehavior. If you want to understand why this is happening look closely at ST2052BD.