I'd be more concerned with a 75" TV falling on my infant and hurting him! A 75" television can weigh up to 100 pounds - that's a lot of weight to be falling on a 24 pound infant.
There are a few things you can do to protect the television and the infant. One is to use safety straps - these don't mount the television to the wall, but they do attach to either the wall or the stand, and prevent it from tipping forward.
Another is to gate around the television - the whole way around. You don't say how it's placed in your house, but however that is, you can use gates - just perhaps a lot of them.
Another option might be to have a larger TV stand. Babies want to touch and hold onto things while they're learning to walk, and so a larger table/stand that gives a good amount of space before the baby gets to the television will help a lot here as well.
Mainly, though, a child that age should not be unsupervised for any period of time - so the best protector for your television is yourself. Kindly teach your child not to throw things at the television, and redirect your child in more safe directions, as necessary. And, perhaps, reduce your time in front of the television - the things you're interested in, your child will be interested in.