Chosen Solution
I just replaced the screen on my surface pro 4 and everything went smoothly except when I booted it up. It worked fine it showed the display but the touch screen wouldn’t work. I’ve tried disabling the touch from device manager but it wouldn’t work.
A possible cause is that the short ribbon connectors that go back into the small L shaped board that had to be transferred from your old screen to the new screen. If these ribbon cables are not pushed in far enough or are slightly off the touch will not work or works strangely. I read this on another forum somewhere and can no longer find it but it seems a possible culprit to me.
This could be a bad screen from the factory or the digitizer cable may not be seated properly, I would suggest opening it back up and reseating that cable and if that fails I would try sending the screen back for a replacement to the company you got it from.
Check if the LCD touch mainboard is grounded to LCD, there is a conductive glue in back…if not use a tinfoil to make connection…in some case there are some electromagnetic interferences that can prevent operation. Good luck!
All above suggestions are 100% correct. If the touch is still not working give it sometime, maybe 10-15 mins. I have replaced many Digitizers for Surface Pro 3,4,5,6 and one thing I notice is for some replacements touch wont work immediately and it may take upto 5-10 mins. Maybe some drivers are being installed in background. Give it a try, Goodluck!
