screen shows no activity when plugged in a continuous "bong" sounds

Hi I purchased an iphone from a friend that had a cracked screen worked fine but the screen was cracked was all. Bought a replacement and after installing the Iphone would not turn on. I plugged it into a charger and the phone is making a continuos "bong" noise every 5 sec or so. I removed said screen and it works fine on another 5c I have as well as taking screen from said extra phone on the broken phone same problem. so it is not a problem with the screen. I have inspected the logic board and phone shows no broken or burnt out components. I have no idea how to continue has anyone else had this problem.