Why wont my LCD Screen/Battery I just got delivered work?

So i had a fall at work and landed on my back off a ladder from about 15-20ft and my phone ended up having the LCD screen crack and slowly started to fade black bit by bit till it was un-usable. I have had back luck with phones over the past while and used up my apple care. I also noticed my battery life was starting to fade dramatically since i fell. So i went to IFixIt and ordered the two components i needed (iPhone 6 LCD Screen and Digitizer Full Assembly & iPhone 6 Replacement Battery) I received both parts and noticed right away that in the LCD case there was a tiny metal bracket loose and didn't think much of it (will re-address this later). My brother has all the equipment i needed to do my step by step replacement for both parts and did everything to perfection even transferring my home button to the new screen, as I was super detailed on what had to be done. I then came to the very last step of putting the two exterior screws in either side of the charging port to then notice they were not screwing into anything, I looking inside to notice the metal bracket i noticed was loose in the packaging right at the start was the missing part, it had broken off prior, i only found one metal bracket and the other was just not in or apart of the case? never the less the LCD Screen wouldn't turn on.. i don't know what is going wrong or if the LCD screen is broken as the 2 metal brackets not attached made the screen loose its integrate of coming to me in functional quality.

Any advice on what might be the problem or any solutions?