That sounds great unless you're a 5'2 110 lb. woman and he's a 200 lb+ male. Guns are an equalizer.
In a fight between a 110 lb woman and a 200 lb man whose hands are occupied by a TV, my money is still on the woman.
And even if that wasn't the case, see previous point: a TV is not more valuable than a human life.
You do know he could just set the TV down for a few seconds, right? Or just kick her
I have an experiment for you - go pick up your TV, then try kicking something. Unless you have a pretty small TV, you're going to have a difficult time getting much power into it.
Kicking is also a really shitty defence unless you are actually trained. It puts you off-balance (when you're already top-heavy due to holding a heavy TV) and most people can't kick above their own hips while still generating any respectable power (martial artists excepted). They're also generally pretty slow attacks compared to a punch.
As for putting the TV down, the robber is going to have a choice between dropping and likely breaking the TV, thus rendering it worthless for stealing, or taking several seconds to gently put it down somewhere, which is ample time for the woman to grab whatever melee tool is at hand (an umbrella, a lamp, a chair) and brain the guy with it.
Flat screen TVs aren't that heavy, more awkward than anything else. I have no problems with the weight of a 50 inch flat screen (but then again, I've also been doing manual labour for the majority of my adult life, maybe you don't have as much experience with heavy lifting.) A 200 pound man isn't going to need to use too much force to knock down a woman half his size. I once accidentally bowled over a woman that size by walking into her (looking one way while walking the other) and I don't even weigh that much. ---
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