Everytime I run my steamdeck on my tv i have to do this precisely in this order 0. Turn off steamdeck 1.unplug steamdeck and disconnect video cable (hdmi) 2.turn on tv and choose hdmi 1 for input 3. Turn on steamdeck 4. Once turned on plug in hdmi cable 5. Video should turn off on steamdeck and turn on on tv 6. Now plug in power to steamdeck

I found this solution online in a forum after much searching. Its like witchcraft but must be done exactly in this order. Gerd lerk, lemme know if it works.