This is the problem im having with the fpv , if I connect only the Av output to my tft screen it doesn't work it used to work before, but if I connect both my Av and audio to my tv it works well, and If I remove my audio plug out it stops working,(both the Av ND audio  have to be connected  for it to work)it used to work before with just one,  but now it works only in d tv with both the Av ND audio  connected , I don't know what the problem is ,does anyone know what the problem?

The video cable ground might have been cut some where . that's why it is working only when Audio is also connected .

For checking this try connecting the ground separately with a wire.

Yeah that might be it , but my audio cable is very new anyways ill check it and get back , thanks

So it doesn't work on your LCD , try giving ground separately

Yeah that's exactly the problem, I gave ground separately and it worked, thanks !