iPhone 6 "Black"screen after LCD Replacement

Hello,

I've recently replaced the case of my iPhone 6 and everything worked fine, except the home button. Touch ID was working, but clicking the home button wasn't.

As I thought that taking out the LCD and putting it back in would fix the problem, I tried this.

After replacing the LCD and testing all connectors if they're "tightened", the "black" screen appeared.

I looked up if it could be the "long screw damage" and it really seems that I accidentally changed the 1.7mm screw with the 1.2mm screw.

But, if I'm turning my iPhone on, the LCD still lights up, you can see this perfectly when the whole room is dark. There are a few colored pixels, which I can see when its on full brightness.

Vibration, Speakers and Light Sensor (Thats how I change the brightness) are still working.

I can't get into iTunes, because there is no way to enter my Pass Code, but it gets identified as soon as I plug it in.

Does anyone here has an answer to what my problem is?

Or maybe even a solution.

Thanks!

PS: Sorry for my "bad" english, if there is anything you don't understand, feel free to ask me.