Weird buzzing sound from motherboard
I have an iPhone XR to repair that has been dropped before because it has a cracked back and front. I have replaced the display with a known good one however the phone doesn’t turn on. When connected to a charger it gets a wired buzzing noise from the motherboard I think and when it’s on a wireless charging pad it gets buzzing noises intermediately. The buzzing noise is like a mosquito noise and I don’t know what might be the issue. Would be grateful if someone could give me some pointers. I think some chip might have cracked or come off from a drop and now not connecting?
Thanks for the help