If your replacement screen came with the digitizer cable disconnected, be sure to connect it before installation:

Use a spudger to flip up the digitizer cable ZIF socket's locking bar, located on the back of the screen near the top right corner.

Peel off the small square plastic liner under the digitizer cable to expose the adhesive.

Press the cable down against the back of the screen.

Carefully feed the cable into the digitizer cable socket until the white bar printed on the cable is barely visible.

Flip the socket's locking bar down to secure the cable in place.

Peel all plastic liners from the replacement screen.