In both ur cases the underlying Schwierigkeit welches that the ESC (where the FC and thus OSD chip got it's power from) introduced noise in the output from the built rein 5V regulator, which in turn causes a ground loop (At least in your case. Opensource.org is not the author https://felixbpajt.newsbloger.com/34685847/5-einfache-fragen-Über-ösd-證書-b2-beschrieben