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MacBook Air keyboard doesn't respond until login screen appears

Hi Friends,

I have a 2012 Macbook Air that i recently wiped and reinstalled Catalina but i cannot reset the NVRAM using the normal p+r+cmd+opton keys. I was able to do a SMC reset but whenever i hear the chime, none of the keyboard keys respond.

Secondly, i attached a external keyboard and still was not able to get it to do a NVRAM reset. I have confirmed the usb ports work and the keyboard works once i’ve booted to the login screen. I am really confused as to why the keyboard would respond once at the login screen but not when i hear the Apple chime? Someone please tell me they’ve ran into this before?

I did see that the touchpad may have an issue and may need to replace it but thought i’d ask here first.

Thanks!

Rob

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The keyboard feeds into the trackpad where both signal sets are encoded by the UART chip on the trackpad and then sent onwards to the main logic board.

So I think you need to replace the trackpad and you may also need to replace the battery and the trackpad cable as well! What can happen is as the battery ages it can swell up pressing on the cable and the trackpad as well damaging them.

MacBook Air 13" Mid 2012 Trackpad Replacement

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Hi Dan,

Thank you so much for your response. I swapped out the trackpad and connector cable but am still having the same issue. The keyboard and touchpad are working fine once the computer boots but it doesn't explain why i cant do a PRAM reset when i hear the chime. Any other ideas?

Thanks,

Rob

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Check the SMC & trackpad's firmware levels. You'll need install your original trackpad to see if the trackpad has the correct version the SMC can be checked using the SMC updates on Apples support download site. If you have a friend wh has the same system as your you could also compare with theirs.

Go into About This Mac > System Report, then go down to USB click on the Hub object the internal keyboard is within. clicking on the Keyboard won't show the firmware levels you need to click on the hub level and then look below for the keyboard. For the SMC click at the root Hardware and then look at the hardware Overview panel.

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I was working on an issue similar to this although the keyboard only worked before log in. I found up until logon screen the keyboard and trackpad are working from the USB, when booted the SPI communications kick in.

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@imicrosoldering - IOS ?? Are you asking why it doesn't work during EFI boot?

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@danj I meant Mac os. Just saying that the keyboard is run by USB communication until the login screen.

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Robert Carbajal будет вечно благодарен.
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