[eru]

What about saying in big bold letters 'requires constant electricity to function'?

That would be a ridiculous requirement, because people expect that TVs need electricity. But the producer can argue that people these days also expect TVs to need the internet, can't they?

[myself248]

They sure as fuck cannot, I've never connected a single TV to the internet. That's something that needs to be explicitly declared.

[eru]

That would be a for a judge to decide.

[myself248]

They're going to take me to court for returning a TV?

[eru]

They might refuse to accept your return, and you might have to enlist the help of the legal system, if you want to force them to accept it. Of course, details depend on your jurisdiction and on the retailer / manufacturer and what warranties they give you (or are forced to give you), etc.