Got my Phantom4 back from repair the other week and when i was going to try it out today it would connect up? Reset my app to connect to drone or what do i do?

I get a red color aircraft disconnected in the top left of the go app.

Look at video to link RC or read the RC link procedure, DJI tested after the unit was repaired so you lost the link from your RC to the Phantom, you will have yellow lights when the link been lost.

Please relink your drone and RC. Then try again