I have this interesting issue. The visuals have complety stopped. No when I originally rebuilt it the visuals worked fine. I go out to the field. And they didn't work. I changed the channel on the goggles (I think) and the visuals came on. Thankfully. I was doing some practice flying in a building and bumped a wall and just decided to ground. It. I wasn't very high. 4ft and when it hit the ground the visuals went back out. Everything in the osd appears normal connection, battery all that. Screen is just black with the DJI logo. I unplugged and replugged the wire harness for the air unit and that was really the only thing that I thought I could be. So I'm curious if anybody else is ran into this issue , and has the answers that I seek.

I would check the camera, or the wire going from cam to vista if there is any damage to it from the crash. If OSD works, but no image it makes me think it could be camera issue.

Is the led in air unit turning green?

If your air unit is getting power and ground it should transmit video to goggles.
Since it was working then stopped after traveling to go fly check for loose connection and check for bent pins on connectors going to air unit or on FC going to air unit.

If you remove connectors be careful plugging back in for if plug isn’t plugged straight back in those tiny pins bend very easy.
Now I’m very careful and double check all pinned connections because I have bent pins and didn’t feel them bend.