Chosen Solution
I replaced the LCD screen on my iphone 7 plus and now it won’t start up, checking the voltage on the battery shows 3.7 volts, is it possible the battery is too drained or is there likely something else at fault? I tried connecting it to iTunes and didn’t see anything happen so I unplugged it and put it on the charger, 20 minutes later I go back to my computer and it says my iphone cannot be accessed because it has a passcode. So iTunes recognized it, but it didn’t prompt me until after it had been disconnected.
You’ve purchased a poor quality display, the phone won’t recognize it. Apparently Apple is getting a bit more finnicky with their acceptance of copies. That or you just straight up got a bunk display. I would return it, get your money back, get a good quality one. I think ….yeppers iPhone 7 Plus LCD and Digitizer I don’t work for iFixit, I work for me. Yes, you need to pay for quality, or play Russian roulette with your money/parts
