Shows apple logo then only backlight lights up

Hi there,

I have a 5S that needed a new screen. I replaced this and it was perfect for a week or so then the bottom part of the screen became unresponsive. I opened the phone and replaced it again (assuming it was a faulty part). Now the phone turns on showing the apple logo and then goes black. The screen is lighting up as the backlight is showing but there is nothing else and no sound. When plugged into iTunes it recognises there is a problem and I have tried restoring it to no avail. any help would be great, thank you