iPhone 5 won't turn on after screen repair
I know this is a dead thread, but you may have possibly bricked the device. Try to make sure all screws inside are intact and screwed in properly and all cables are plugged in properly. You could have also damaged the battery. If you have another iPhone of the same model you can try swapping out the battery and see if it works in the other phone. If it does not, try replacing the battery. If it does work, try to turn it on and then call it or use find my iPhone or plug it in (just do something that would make noise and make sure the ringer switch is on so it will make noise). If it does not work you may have a damaged logic board and you will probably be better off buying a new phone.