Hello All,
I too, just did a replacement of a screen on an iPhone 6, actually this was a full refurbish project where i moved all parts over to a new housing and a new LCd assembly. During the process, i believe i damaged the connector closest the the Touch ID (not actually the touch) that is glued to the back of the LCD. The button function work "kinda". I'm going to replace the flex cable that runs along the back of the screen, this is a very cheap fix. As long as the flex of the Touch ID its self isn't damaged, you should be in the clear. i've done 100's of fixes, this is the first time I've damaged this part.
Thanks,
Nate