follow-up: Found the answer - it is not enough to just re-heat it, display falls of again. And in the process of cleaning the edges I finally managed to rip off one contact of the Force touch sensor. So maybe should have taken it out in the first place to do the cleaning. Was just trying to avoid disconnecting the other two connectors which looked scary but wasnt.
Ended up having to use the sensor that came with the kit… and then… big disappointment - the necessary screwdriver bit was missing from the kit. I think the screwdriver is supposed to come with three bits, one of them the tri-tip. But mine had only two bits in the handle… maybe better that way, cos looking at those other bits… not very impressive precision there. So ordered a separate Y000 screwdriver online and did the whole thing again. Now I think it finally works though…
Instructions almost great (missing my scenario), parts great, tools big miss. Probably worth 3.5 stars…
The battery change was not difficult, everything worked as described, all the tools and parts were there (even the battery adhesive was included, despite the description saying that it isn’t).
Except one thing: the description is missing what to do if the Force-Touch-sensor is NOT damaged.
What is the best way to put the screen back on without replacing the Force-Touch sensor?
Does it need glue? Or just re-heating and pressing it on is enough?
I tried the re-heating and so far ok, but I’d really like some guidance… will this hold? Or should I use glue… what kind of glue?