Hi!
I just purchased a Ender V3 KE (refurbished through the Creality ebay store) and I assembled it according to the manual, I set everything up and printed the boat that was included in the USB drive and it printed it out perfectly.
I then did a firmware update through my phone to the latest version (.15) and started to print a new model, after a few layers the printer head stopped in the middle and I heard that the fans was still spinning but the screen was black and unresponsive so I turned it off and back on and everything came back to life.
I tried printing again but that did not help either, so I did a factory reset and when I got to the self testing part it did the same thing (I think it crashed when either trying to heat the bed or the nozzle).
So I tried downgrading the firmware to .14 and tried the selftest again but the same thing happened, I also tried another model but that did not help either.
I have also checked the voltage input on the back and its set to the correct input.
Any suggestions on what might be wrong?