Limit TV time to focus on important things

Put your TV in a bizarre corner of your house.
This will make watching it awkward and inconvenient.

Ditch your TV for a projector
The hassle of setting up a projector every time you want to watch TV may discourage you.

Limit the number of entertaining programs on your TV.
Cancel cable, Netflix, HBO and the like; instead, rent or buy movies and episodes once in a while.

Unplug your TV and store it in the closet/storage locker when you are working on a big project.
This will keep you focused on your project.