iphone won't turn on

Hi all. After unsuccessfully replacing the battery on an iPhone SE (2016), it does not turn on. I thought maybe it was the new battery. I tried installing the old one and it was still the same. Then I thought that I might have damaged the board when installing the screws. But when iphone is connected to PC I hold down the Home and Power buttons for 20 seconds, notification pops up in the iTunes app saying something is wrong with the iPhone and offers to update it or reset it. After an update attempt it still won't turn on. I tried many times, but nothing. So did I damage my iPhone or is there a problem with the display? It seems to me that I should hear a sound when iphone on the password screen, no?