being an rc-flyer i’m having multiple of those servos lying around.. just tried one – but as suspected – it’s the same with that.
would have surprised me anyways – since the manual “pen up” and “pen down” work fine, it’s the “enable motors” which makes the servo show this erratic behaviour.
i’d actually suspect the controllerboard, visually it looks ok, but with those smd bugs one can’t tell for sure of course..
anything else i could try myself?