In both ur cases the underlying Harte nuss welches that the ESC (where the FC and thus OSD chip got it's power from) introduced noise rein the output from the built in 5V regulator, which hinein turn causes a ground loop (At least rein your case. You can find all https://osds85173.eedblog.com/34282960/osd-課程登錄-grundlagen-erklärt