M.T.
My son is almost 1 and does EXACTLY the same thing. Worse, when I go to pull him away from the TV buttons, he shrieks with joy like he does if I chase him when we're playing. He thinks it's all a game. We just continue to say no firmly and redirect his attention. He'll go right back too, so I find that I have to redirect by sitting down and playing with him on the floor at least until he forgets about the TV. He does the same thing with our water dispenser; luckily the hot button has a lock, but he's poured the cold all over before!