For me, TV is not really a big deal. They are switching to digital TV soon anyways.

Edit: you could check the TV tuner a little more. You can use Navcoder and a Resler interface to check the TV it there, you can check for bad wiring in the antenna or the connectors, you can check for voltages on the cables, you can take off the battery and the nav all night and see if the TV tuner comes back!