I bought a new PS 5, but when connected to the TV, everything turns off. I do everything according to the instructions. I don't understand anything.

It seems to you that you are doing all the actions correctly, according to the manual, but somewhere you make some mistake. It was exactly the same with me. I was one hundred percent sure that I was doing everything right until I went to the playstation customer service website. There, after I explained everything, they told me where I made a mistake and everything began to work for me in the best possible way to this day.