Diatone have informed us that there may be a problem with the 5V BEC on their first batch of Fury F3 flight controllers. They tell us that this problem may be caused by some soldering flux which may affect the resistance value or circuit contact. If you have experienced this problem, they suggest the following:
If you have bought your Fury flight controller from us at Unmanned Tech, please contact us and we will help resolve your problem directly.