Can a slideshow project in Elements 15 be exported or saved as a file of slides rather than as a video? Producing the video format takes an extraordinary length of time and is not addressable on some DVD players.
Many TV sets will be able to display a folder of jpeg photos on a thumbnail stick as a slideshow. You can prepare such a folder with the right pixels resolution, either with the 'process multiple files' feature in the editor or with the 'Export to new files' command in the organizer. Very fast and low size. Some of my friends use the presentation feature of Microsoft Powerpoint.