Touch not working after screen replacements

Hi Christian. The folks answering questions on this forum are not iFixit employees, just volunteers.

Regarding your question, Home Buttons are very delicate. The flex is very narrow and has multiple copper traces running through it. There are also some electronics components on it to handle some (or all ) of the Touch ID functions depending on the model. So you have to be very careful when you peel off the flex from the screen frame. You could also be damaging the FPC connector, either on the Home Button or on the Home Button Extension cable that runs beneath the backplate.

Obviously, it's hard for me or anyone else to know what you could be doing wrong. I can only give you some ideas about what I typically see or have lived through when I started out.

If you are going to do repairs on a semi regular basis or more, I would recommend a magnifying lamp for your hobby desk or some kind of head magnifier (I don't know if this one is any good). Everything is very small in an iDevice. You need lots of light and magnification to really understand what's going on.