Jayeff had some great ideas. I’m going to assume that the digitizer was working before the repair. With that said, did you replace the screen connectors back onto the logic board with the new battery connected first? This can sometimes cause components to get a surge of energy that can damaged them. I would also inspect the connectors to see if any of the pins are bent. This can be easy to do if you tried to seat the connector back on and pressed it down without it being in the right spot.