Yesterday I replaced the screen on my Samsung s21 ultra. It all went well, and I managed to turn on the display and it worked fine. After that I had to separate it from the frame to remove the top layer of the tape. I put everything back together and about 20 minutes later I tried to turn it on again. And nothing. It vibrates but the screen shows no sign of life. When I got home again, I disassembled everything except the screen, put everything back together and still nothing. The screen doesn't work anymore. The cable shows no signs of tear or anything like that. I really don't know what to do, and I REALLY don't want to spend another 200€ on a screen.