In the end I looked at settings on the Apple TV and found the solution. I then started playing around with my tv settings and still nothing. I did search on the web for a solution but could not find anything. However the strange thing was i could hear sound for other things such as navigating the menu, watching previews/ trailers of movies but nothing when watching the films. When playing movies after the update I could hear no sound. I recently updated my tvOS version to 13.4. I have now found the answer to this problem but wanted to let others know in the community incase you have the same issue after updating your tvOS.
