Screen replacement rendered Apple Pencil useless

They are not compatible only because the sensor for auto brightness will be blocked, quick means you will just have to shut off auto brightness. Not a huge compromise. Everything else works great—except dead spots with pencil if you stroke a certain way. Finger works. fine for drawing. My guess is the digitizer might have a component damaged?

@mozadi307 I Suspect you may be correct. I haven't done research into the intercompatibility, but the pencil communicates slightly differently with the digitizer than your finger does. I believe there is a specific layer in the display which checks for the Apple pencil's presence specifically as opposed to a hand. And it may be this is the part that is damaged.

Got the same issue after replacing the USB C port on my 12.9 2018.

Tried to be super careful with the heatgun when heating the adhesive under the screen but after the repair it still ended up with a few dead spots when writing with the pencil, touch works fine and sometimes the pen works on the spots when the tip is vertical or when more pressure is applied.

I don't know if there are two digitizers internally but it's a shame that this one failed, wish there was a fix aside from replacing the screen.