Put a 20" flat-screen in it. What's he gonna watch? There is nothing on the TV band anymore. It went all digital. You could install an 300 ohm RF modulator to play Atari on it but I don't know what you can watch on it in It's repaired state. Make it a backlit aquarium.
If he doesn’t want to fix it he is going to use it for his cat. Not a litter box. His cat like to hide. I saw a couple of videos where they wired in to ad a jack to plug in a DVD player.