Carlos has an LG G6 Android phone and he also has an old Samsung plasma TV. Can he use DLNA to cast to it? Leo says that he can't do it natively, but he can plug in a Google Chromecast to the HDMI port and it will work to cast from his phone to the TV itself via the Google Home app. It works really well and it's very easy to setup. Most apps will do it.
Another option is Miracast through his Windows machine if he has movies there, but it doesn't work very well. Chromecast works much better.