Galaxy Core Prime streaky screen, cant find answer anywhere.

[queencho]

So i,ve just replaced the lass and the touchscreen on my Samsung Galaxy Core Prime, it works fine when i turn it on. However, when i lock it or it turns black by itself, it wont turn back on properly, all i get is a streaky screen with some of my apps or the opening screen behind it. Anybody have any advise on how to fix it?