I've recently set up my raspberry pi with the screen and I am getting bright greenish lines on the right-hand side of the screen and a little rainbow box in the top corner. I've attached a photo. The lines aren't as thick as they look in the photo. They're thin and close together but the phone doesn't pick them up very well.
I set it up with the red and black wires between the pi and screen as suggested in the setup.
Would it be better if I used a different power setup?