New screen works, but blanks when assembled to the base

I have my new screen attached by the cables to the logic board, but not fully seated to the base. Kinda like a clam shell. The phone boots up and works fine at this point. However, as soon as I start seating it to the base, the screen cuts off, but everything is still working fine. The screen is blank, but all the other functionality is working. I can even navigate (from memory) to apps. I normally just have the phone open after doing a screen reinstall then shut it off to do the final installation steps, but I wanted to see when it was doing this after the first time I sealed it up. I seems like the act of pressing the screen to the base causes it to go blank. I have tried to reseat the connectors to the logic board and that hasn't worked. Any help please?