T.V.

I HAVE A 32IN PANASONIC TELEVISION, THE TV TURN ON AND OFF, BUT SOMETIMES I HAVE TO BANG THE SIDE OF IT TO SEE THE PICTURE AGAIN. SO I WILL BE WATCHING TV AND ALL OF A SUDDEN THE SCREEN WILL TURN BLACK AND THE TV WILL STILL BE ON. SOMETIMES I WILL HAVE TO BANG IT SOMETIMES I DON'T CAUSE THE PICTURE WILL SHOW ON IT'S OWN. IS THERE SOMETHING I CAN DO ON MY OWN TO FIX THIS OR DO YOU RECOMMEND ME TO REPAIR IT SOMEWHERE?