Chosen Solution
occasionally, some of the keys on my keyboard don’t register a keypress. most notably s and r, but sometimes others as well… it does seem though like it’s always keys that are on the left hand when typing. i don’t recall ever seeing it happen on right handed keys… what should i be looking at first to try to resolve this? i took the bottom case off and cleaned everything out with compressed air, hasn’t resolved the issue…
You might want to check your battery to make sure its not pressing up as that can happen. Most of the time I find the center keys get effected first. You’ll need to remove it to check it out. The other possibility is some keys get a beating as they tend to be used more. S’s & R’s are two of the most used letters. Using the show keyboard menu option by enabling it with Keyboard Preferences will allow you to buy some time as well as a way to test your keyboards keys. If you think it’s not the battery, then it’s likely time for a new keyboard. You can replace the full uppercase assembly or you can replace the keyboard alone. Here’s the IFIXIT guide you’ll need to follow: MacBook Pro 13" Unibody Mid 2012 Upper Case Replacement Here’s the uppercase: MacBook Pro 13" Unibody (Early 2011-Mid 2012) Upper Case. Replacing the keyboard alone is a bit more work and you do need to be careful in taking the old one out. Frankly, I think just getting the uppercase is just easier. Update (01/13/2018) Here’s an image of a bad battery looks like:
I have replaced my battery but but now some of he keyboard functions don’t work. Well sometimes they do and then don’t. Cannot use the QAZ volume increase and erase button. I would think that either your ribbon cable is connect or not. Not that its partially functioning
