Turns out the NTrig board is--you guessed it--GLUED to the back of the screen. Removing it took three steps: (1) Use the Spudger tool to pop off the connectors holding the two ribbon cables (2) Gently pull out the ribbon cables using tweezers (3) Slowly and gently slide one of ifixit's blue pics under the NTrig board The board should have completely come off. You should be able to use the exist glue or 3M Double-Sided Adhesive Tape to re-attach the board onto the replacement screen. NOTE: Re-attaching the ribbon cables to the NTrig board is very easy to mess up. My initial attempt resulted in the touchscreen not working. Reseating the ribbon cables on the NTrig board fixed the issue. So be sure to test out touch functionality on the new display (by connecting the two ribbon cables on the screen to the motherboard's cables) before gluing it back on the chassis.
I've removed the cracked screen from my Surface Pro 4 and hope to replace it with a new screen I bought on eBay. Unfortunately, the new screen doesn't seem to have the NTrig board attached to it.
Is it possible to remove that little board from the old screen? If so, how?