A:Answer If your concern is of smart TVs accessing your computer files I have a fix, search out 3 dumb routers networking, there is an excellent video of how to set this up. This quarantines your PC secure network from your IOT insecure network, nobody can hack your TV to access your computer network as it is segmented physically.
However if your concern is someone using a built in microphone to spy on conversations that is a bit tricky, you would need to disassemble the device and cut the wires to the microphone. This would void your warranty