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Procesador Intel Core i7 de cuatro núcleos a 2,2 GHz (Turbo Boost de hasta 3,4 GHz) o 2,5 GHz (Turbo Boost de hasta 3,7 GHz) con 6 MB de caché L3 compartida.

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keys from 1 to 9 and their upper cases not working

keys from 1 to 9 and their upper cases not working, started two days ago. Macbook Pro, retina, late 2014. I did: reset SMC, reset PRAM NRAM, reinstalled OS, installed upgrade OS, disabled mouse keys, started in safe mode, did disk first aid repair, started in recovery mode, etc. Nothing works. All other keys are working. Still. Nothing has been spilled, no drops, dirt, etc. I have been using it for a week, the issue started only days ago. The machine looks pristine and has only 17 battery cycles. I am using my keyboard viewer in my language prefs to type this.

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Try using an external USB keyboard. If it works, first try reseating your keyboard to logic board cable. If issue persists, replace either keyboard or upper case.

See step #25 of this guide:

MacBook Pro 15" Retina Display Mid 2014 Upper Case Assembly Replacement

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But my keyboard is working fine. Just these keys are not working. Why do you think they stopped working?

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Thank you so much, unfortunately I do not have an external keyboard and cannot possibly replace anything according to the article you provided. I do not see well and I do not understand what should be done. My machine is almost new and I am afraid to damage it. I have a couple of more details, if they help to diagnose the problem: yesterday the keys started to work again, just out of the blue. In a few hours, they stopped working again, but it was possible to type the number if I hit the key hard enough. Then they stopped working completely. Now I have my keyboard backlight set to switch off after sec of inactivity. With the backlight off (as keyboard inactive) if I hit any of the numbers, the backlight does not turn back on, although it does if I hit any letter key. That means the keyboard does not recognize the number keys. So what should I do? Bring it to the repairs and tell them they should replace my upper case?

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Jimmy Dore estará eternamente agradecido.
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