Try taking the battery out but the best way to take the battery out is to pull it out very straight because if it isn’t straight it won’t come out and then clean off the contacts then put the battery back in.
I’ve replaced a display on an iphone 5c and when I turned it back on the phone was stuck on the apple logo so take the old display, hook it up to the phone then the phone should boot up, and then you connect the new display while the phone is running then it should work fine.
I’ve replaced a display on an iphone 5c and when I turned it back on the phone was stuck on the apple logo so take the old display, hook it up to the phone then the phone should boot up, and then you connect the new display while the phone is running then it should work fine.