Replaced screen not working

IPad digitizers should always be tested before install to rule out possible manufacture glitches. If it’s not been installed yet you may contact the seller for replacement. If it’s been installed already nobody will replace it, thus the only thing you can do is remove it and check the flex cable has been properly fit in position. iPads are not easy to repair and replacement parts are cheap but prone to give issues, especially if the housing has been bumped and not in perfect shape. Have a look at this great post by @refectio , it might help you sorting things out too.

After doing my repairs (battery and screen) I have problems