Take an old tv apart, take only the internals.

Measure the dimensions, and make from nettings a square shape of the tv.

Make a mold for one side of the square tv. This mold will be reused for all the other sides.

The front of the tv, needs a hole for the screen, this is made by 4 extra pieces of wood on the mold;

Two extra holes on the front are for the ir blaster and the on/off switch. These are made with nuts.

The frame, made of nettigns goes in to the mold and concrete is poured on top.

When the concrete is still liquid, you have to put 4 pieces of wood in the corners of the hole for the screen. They will stay there when because of the concrete.

Later you will be able to screw the television screen in to the wood, so it stays in place.