Hi, i have done the same thing. I didn't disconnect the battery and the screen won’t turn on. Put the old screen back and still doesn't work. Can someone help please.
replaced iPhone 7 screen and Home button forgot to unplug battery, phone does not turn on tried everything then I bought another screen Replacement and unplugged the battery this time connected the screen and then reconnect the battery still nothing then I plugged it in and found out that the battery was dead just needed to charge"