Chirping/Vibrating when plugged in and no display!
I have an iPhone 5S 32gb on Sprint.
I bought it off ebay as a "no power" unit. I put it into DFU, and restored it. Phone seems to work fine but display does not work at all and when plugged in it either vibrates or chirps, depends what you have it set on. Once unplugged, it stops.
Is this a good question?