Best answer by Airgetlam
Depends on whether your TV has an analog audio out port of some kind. Either part of a Component connection, or even a headphone jack. You'd connect that output to the line-in on the PLAY:5, and get audio in to the Sonos system in that manner. Of course, any analog line in has a slight delay on it, of a minimum of 70ms, and sometimes more, depending on the settings you choose, so you may have an issue with lipsync with your TV.
This is one of the reasons (I think) that Sonos came out with the PLAYBAR, PLAYBASE, and Beam, all of which have digital line ins, which don't have the same penalty of a delay.