Screen fade to black on start up.

Here I have an iPhone 6 Plus 128GB. I've constantly had problems with the digitizer ribbon always coming loose upon drops and having to open phone and seat ribbon cable for digitizer back in. Before I could replace my screen, I feel like I may have shorted a component on the logic board out.

Upon disconnecting and reconnecting battery, I power on phone and the Apple Logo will appear and then fade to a hard contrast to black. The phone still lights up when you click anything, silent button works, calls come in (that I can't answer), and even Find My iPhone will sound off. But the screen is black and touch is gone. If I hard reset from this point, the phone will not turn back on. Only way I can turn phone back on is if I disconnect battery and reconnect battery, then power on, where the same 'fade to black' issue happens.

I'm trying to see exactly what is malfunctioning and where I can find parts to fix or find a reputable micro soldering company to send phone to fix.

I have not backed up over a year and can't back up unless I have a passcode entered and I can not enter a passcode on the phone because screen goes dead.

Any help is greatly appreciated. Thanks.

Here's a video I have of the exact situation.

https://www.facebook.com/efrainvargasmus...