Battery replacement failed to light screen

I bought the battery replacement kit and followed the directions. I practiced on another, identical, broken device, so was pretty familiar with the procedure when I got to the “real” phone.

It seemed that all went well. When I fired it up (before applying the final adhesive) I got no screen response. I charged it overnight for about 14 hours (no screen indicator during this time).

When I press and hold the power button I feel a haptic vibration. The vibration is very brief. That would seem to indicate that the battery is live and connected.

I don’t know what to do now.

Any thoughts?

Bill