Kenwood KVT-719DVD 7 in. Car Monitor "vehicle dvd player sound picture" Questions

...dvd player in my truck..i get sound but no picture....what can i do to resolve this?????????does it even work in motion..i cant get a picture in park...h e l p????? Did you install it, they generally ...

...dvd player that was attached to the rosen monitor we have in our 2003 toyota sequioa died. So rather than buy a whole new unit we got a samsung tablet and hooked it up to the monitor so my kids would ...