Is the new remote set up for IR, or does it use some other method (RF, Bluetooth, etc?) to communicate with the TV?

The Ray is only capable of seeing IR. 

Is your new remote ir or bluetooth?

I tried to hook up Sonos Ray to Sony TV using IR cable provided with Sony Ray purchase. I also use a FireStick for Tv. Tv worked fine until I tried to install Sonos Ray and now no sound comes from tv. Fire stick works for everything except sound now. Sonos Ray sandbar can be controlled by phone and Sonos app to play music, volume can toggle up and down, but once I select to play the Tv through the Sonos the volume stops Working. Also I have tried disconnecting the Sonos, resetting the fire stick to factory settings: and still nothing. Any ideas?  So frustrated. 

Try turning on the optical output in the Sonos TV audio menu.