Why is my screen going in and out

Well I had a friend sit on the phone and crack the screen it worked fine for a week or so then started to get progressively worse until I couldn't see the screen and worked it off of memory then I went to get the screen replaced at a local cell phone repair store. All was fine until one day I was watching a video like a week later and the screen sent black and wouldn't come back on. I then took it back to the store and they had it for a week before they called me and said it was fixed. I got it back and the very next day the screen went out again to come back on out and on. I'm thinking I just need a new phone. I just hate that I put all this money into fixing this one and it still doesn't work. Any solutions?