Hi Piipperi,
The worry with the home buttons is that the tolerance between the components is very small. A single big enough piece of sand can lodge its self between components and work its way into the device slowly cover on or cover off…
It sounds like debris of some sort is stuck in the home button assembly. (as you say) Not easy to get out without a disassembly I am afraid. Especially if it’s not sand or something soft, it could do more damage. Metal shaving and fillings don’t break up like sand does, I know that I have crushed a few pieces myself the last 2 years on my iPhone 6s.
Besides compressed or canned air blasted into the button, (Clean air, or more problems..)
The alcohol sometimes works, but it all depends on what the debris is made of. This can be hit or miss.
Maybe a little bit of cringy button pressing? (I know what I asking but I have a 2017 MBP with the bad keyboard)
You may be able work it out of assembly, or (the not so likely) or it will eventually work its way into the housing, to
where the button stays in that spot, or (worst case), it causes the assembly to malfunction… NOT FUN..
Best solution is to have it cleaned out by technician, this at least makes sure you don’t get more damage and it works again, hopefully you can find a repair tech who will charge a fair fee.
If not ask around for some friends who may know a place or a guy. University students studying electronics and desperate for spare cash may work too… It’s not just what you know, who you know is important too.
Cheapest is probably to spam the home button until it comes loose or you break it into tinnier pieces and try blow them out after that. (the dirt stuff will always still be in there tho.)
But the iFixit teardown is really good if you are backed in a corner and are in a bind. The kits are great and they have a home button listed for a few $ if you wanna buy the part yourself. Other parts there if you need..
iPad 5/6/Air 2/mini 4 Home Button Gasket
iPad Air 2 Home Button Bracket
iPad Air 2 Home Button Assembly
Remember to buy a screen re-sealing kit too if you do!
iPad Air 2 Wi-Fi Adhesive Strips
Do a back-up just in case, be patient and take photos and notes. Label where screws go and you will be fine!
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