Chosen Solution

I purchased a 6 plus to do the screen repair and flip it. The guy said he cracked the screen trying to put it back on and I started it up and worked fine when it came. I took the screen off to test another 6 plus screen I had to see how the assembly was and now that I put the original back on it doesn’t have display on just shows white screen with some vertical lines. Any thoughts?

Sounds like the screen that came with the phone is shot. You can purchase a new one here and use the guide here.