If your TV has bluetooth built in try pairing the phone to it.
If not then you could buy a bluetooth receiver http/www.amazon.com/Belkin-Stream-Bluetooth-Music-Receiver/dp/B00IL7BWGA/ref=dp_ob_title_ce
and connect it to one of the audio inputs on the TV. You might need a video feed to that input too because some TVs won't allow you to select an input without video.
You can use any external source and split the video out to the original and audio only input.
If your TV has bluetooth built in try pairing the phone to it.
If not then you could buy a bluetooth receiver http/www.amazon.com/Belkin-Stream-Bluetooth-Music-Receiver/dp/B00IL7BWGA/ref=dp_ob_title_ce
and connect it to one of the audio inputs on the TV. You might need a video feed to that input too because some TVs won't allow you to select an input without video.
You can use any external source and split the video out to the original and audio only input.