We need a little more info, did you place the TV floating in the air in Hammer? If so it will just fall to the floor being a prop_physics. Also, i don't think the TV has gib models, so unless you fake it, you won't be able to destroy it.
If you're looking to make it a proper TV, as seen in HL2 with an actual 'show' and the ability to pull it out of the socket you should seek a tutorial.