LG smart TVs caught logging audio with screen off and snooping on local devices
(www.notebookcheck.net)
But also never assume that's a foolproof roadblock to exfiltrating data.
Just a few weeks ago, there was that story of a TV that managed to use an HDMI connection to a Windows PC to trigger automatic download and installation of third-party drivers on the PC, which could then definitely facilitate data exfiltration.