Also if that dongle setup isnt good maybe your laptop has wifi direct as and your tv has screen mirroring. If so follow this google search
https://www.google.com/search?q=wifi+direct+pc+to+tv&oq=wifi+direct+pc&aqs=chrome.1.69i57j0l3.6678j0j4&client=ms-android-sprint-us&sourceid=chrome-mobile&ie=UTF-8#q=wifi+direct+laptop+to+tv