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I think what the OP means, because I'm having the same problem, is that VLC is not connecting to the Smart TV. I have a Sharp Smart TV, though, and am running Vista (Yes, I know it's outdated, upgrades cost money, unfortunately)
If your smart TV doesn't support chromecast, then that's expected. For now, chromecast is the only type of renderer we support. 4.0 version will have UPnP support, which might work with a lot more devices (you can try a nightly build with that feature here: https://nightlies.videolan.org/build/win32/last/, but keep in mind that it might not be stable at all)