I did the blowing-into-the-SIM-card-slot-thing to fix my iPhone SE. When i would turn on the phone, slowly purple lines would appear until my screen was unresponsive and dark purple. The first time blowing it didn’t necessarily work and I noticed that the portrait mode camera was super fogged up so i sucked all the air out and that fixed the camera but my screen was still weird. I blew into it again as one last hope and THAT ACTUALLY WORKED!!!!! I recommend blowing into it until you think it wont work and keep doing it.