Does he take any lessons or activities outside the home like gym, swimming, art, basketball, soccer, art, music, 4-H, youth group or something?
FOR limited TV dump the cable and only allow dvd shows or taped ones. You can eaisly control what and how much this way.
Consider some simple around the house activites for him to become more involved in. Dusting, sweeping, taking out the trash, laundry or other simple things he can be a help with to you. This will include him and benefit everyone.
I'd try not to make this into a punishment, but more of a good for you habit. And try not to expect him to entertain himself all day. Sounds like he needs more activity, and new friends. Try a trip to the park and a picnic. Wear him out and then enjoy a nice quiet evening yourself.