The screen on my E7250 recently failed so I took the opportunity to upgrade it to the FHD/Touch screen.

I replaced the complete top half of the machine and hinges.  Everything appears to be fine (FHD screen recognized in BIOS, full HD resolution in Windows 10, webcam works fine) with the exception of the touch functionality.  I cannot seem to get touch to work at all.

I've upgraded to the latest E7250 bios (A19)

If I look in Device Manager, under Human Interface Devices only Airplane Mode Switch and Airplane Mode Switch Collection are show, even when I choose to view hidden devices.

I've even tried reinstalling Windows 10 from scratch but no luck.  I'm starting to think the replacement unit is faulty although I would be surprised that just the touch functionality wasn't working.

Any ideas?