Try to hard reset holding power button and home button till it turn on, if it is not working check the lcd and lcd connector whether damaged or not, if lcd damaged needed to replace and if connector needed to do micro soldering
After connecting new screen try for hard reset. Reset the iPhone by holding the sleep/wake button at the top right of the device and the home button at the bottom center of the face at the same time. Hold them both until you see the screen go black. Wait until the white Apple logo appears. When this happens, you can let go. The device will reboot. If this is not working you to replace with geniue display.
Yes you have to replace the front camera ribbon cable assembly, then only it will work bcoz once i replace the display by mistakely the front camera cable was got damaged and i start connect all the connectors the device was stuck and i replace the front camera cable assembly it worked for me, So pls try it