iPhone 6S Finger Sensor not working after screen replacement

"Every fingerprint sensor is permanently tied to the original phone it came with, you cannot swap the sensors.

It is likely that the sensor itself is damaged during replacement, if not, please check if you left the power on when replacing them, there could be electrical damage.

Edit: the following picture is the microscopic image of the cable from Google, just to show you how thin and fragile the cable is. It is very possible for the cable to be damaged during the teardown."

"hi i just got the same problem watch you people reviews and got the answer which work for me, hopefully it should be working for you as well.

i change the screen for my customer and the touch id does't work, then we update the software which doesn't help then i realise to change the screen again and then i change the screen again and then it does work, which means the cable on the old screen was faulty. so best of luck guys..."

reset all settings, then try a restore, look for any rips on either HB cables, failing that try and put the old screen back on and take it back to apple for a replacement, try not to leave any fingerprints as apple decline replacements if worked on by a third party.

"The problem is different when it comes to 6 and 6s

The 6 use the oem flex and the original home bottom then it works fine. For the 6s since replacing the LCD means losing the oem flex , that also means losing the Touch ID functionality. Replaced by Apple fine."

It depends what 3rd party screen you use. I know I have several, some work some dont. meaning they dont support the touch ID a lottery really. tried and tested,

"Hi,did you change the flex cable?

I think it is the problem of flex cable,because if flex cable is not original,the function of fingerprint is not useful."