Was replacing iPhone 6 plus screen when it stopped working.
I am an experienced in tech repairs in laptops and desktops but this is my first phone repair. I am replacing an IPhone 6 plus battery, screen, front camera, and home button. I just found out that the home button ribbon on the screen's back panel was ripped after receiving parts and starting work (my first mistake, not seeing the ripped flex connector) so I don't have a home button. I installed the battery and then the camera on the screen and then the screen on the phone. I plugged it in and powered it on. The screen turned on but would not respond to touch. I thought that I might have connected the screen ribbons poorly so I tried to turn the phone off. With no working touchscreen and no home button I was stuck. With laptops, when this happens, you unplug the battery to turn the device off, so that is what I did. I unplugged the battery off of the motherboard and removed and reinstalled the screen on the motherboard. The screen does not even show an image. If I flip it open, I can see that the backlight is on but there is no image or change in the front of the screen. I think the motherboard is fine because unplugging and replugging the charger makes a sound but I'm afraid I fried the lcd. What do you think happened and is there anyway to fix it? Is just waiting for the battery to drain the only way to safely turn the phone off? Any help is greatly appreciated.
Update (05/24/2019)
Before replacing the whole screen, I want to know if the motherboard connectors or the screen’s flex ribbon connectors are damaged. I've attached images of them both.
Esta é uma boa pergunta?