iPhone 6s Home Button Not Working Problem Way Solution

Hardware Solution;

 

  Clean both home button strip and its on-board connector after you do that re-plug and check.
In case display strip still has a loose contact with on-board connector than change. If the above setup fails then you need to change your entire display, and this is mainly because of the fact that home button components are inside the display screen,

which cannot be repaired manually, as that's the machine's work. You don't have any other option than to change your display screen in order to get your home button fixed.

                                                                       
                                                                           @