Left Shift and Option keys not working

Question

Left Shift and Option keys not working

Repaired following a spill, my 15" late-2013 MacBook Pro A1398 is now fully functional - or so I thought, until I discovered these two keys missing in action. Using an external USB keyboard, both keys register as they should, so I replaced the keyboard with a new one. Same two keys are MIA.

Cleaned keyboard connector on logic board (looks good under microscope, keyboard cable is new), firmware lock is off (turned it on/off to be sure), reset all Accessibility and keyboard settings to defaults. Every other key, as well as all other functions, are fine from new OS on a new SSD.

The fact that it is only the left Shift and Option keys that are missing makes me suspect the problem is some setting somewhere. What am I missing? Thank you for any suggestions...

MacBook Pro Retina

Posted on May 10, 2021 2:13 PM

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Answer 1

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Motorcycle Michael Author

Level 1

139 points

May 11, 2021 12:43 PM in response to BDAqua

Hi BDAqua, thank you for your kind reply. Yes, you are certainly correct, hardware issue. Keyboard Viewer ignores those two keys unless I connect an external keyboard. Keys going to ground is an interesting thought. I wonder where... still trying to find a pinout of that connector. Since those two keys serve a few special functions, that might complicate matters, too.

Thanks for clarifying, always good to get opinions from someone as knowledgeable as you obviously are. Looking for short. Thanks!

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