Troubles with screen installation, black smudge top right.

Hi all

I’m am really hoping someone can help me as I am replacing the screen on my friends phone and she needs it back as soon as possible.

So I firstly checked touch and the screen was working before putting the camera and home button on. Everything was working fine. After transferring everything over I checked the phone. Only problem was that it didn’t seem to have touch, although after going back to the lock screen the touch would begin working again. I never had another issue with the touch unless I shut the phone down fully it would repeat what it did to start with.

I was just about to clean the screen ready to give back that I remembered I should check the camera was lined up properly. Well no it wasn’t it was blurry, so out come the screws again, I cleaned the camera with a microfibre clothe. Put screen back on and now I had a black smudge in the top right corner, so off comes screen again to try alining the camera unit again. Test it again and a fully black screen, I could just see the screen flicking. Back off the screen again looking carefully at the sensors, turn phone back on and it was black again.

I’m running out of options/ideas, I have a spare iPhone 6 Plus, so I grabbed the camera and all sensors off the 6 Plus and transferred it to the 6s Plus. Back to the black smudge in the top right corner. Checked camera again and fully black this time. Touch is still a little dodgy.

I’m a bit stuck and thinking of taking to a phone place. Would it be possible I have damaged one of the sensors or it isn’t aligned properly? Or is it possibly the lcd is broken even though I checked it?

Any feedback as soon as possible will be appreciated greatly.

Will send some photos soon shortly.

Best Regards

Blake