Replaced keyboard MacBook Pro 2011 twice and still not working properly

Your first keyboard had a ROW problem. (Compare to a keyboard diagram.) All the faulting keys were in the same neighborhood on the same row.

the second keyboard had a [slightly diagonal] 'Column' problem. The faulting keys are all in the same column.

Keyboard presses in these keyboards are detected by changes in resistance at the intersections of rows and columns caused by pressing a key at a particular geographic location on the keyboard.

There are no keyboard 'switches' any longer. The logic inside these keyboard is extremely simple and essentially un-repairable.

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you don't appear to be getting "guaranteed GOOD" parts. it may take far more tries to get your Mac working this way.

krlos90 wrote:

Hi!,

I had an issue with my keyboard, some of the keys ( F, R, V, Control etc) were not working. Some of them worked but not correctly. For example, when I typed R, then it showed something like QWERRTT. I could not restart the NVPRAM or SMC because it required Command+R or Control+Opt+Command and the Control bottom did not work.

A month ago I replaced the keyboard with a new one and now different keys are not working ( different from the ones before) now keys ( T,G,B, enter ) were not working while the rest work. What could be the issue? I thought that it was a hardware issue that's why I replaced the keyboard.

I also tried an external keyboard and it works perfectly.

Today I bought a new one, installed it and now none of the keys work and now the power buttom does not work properly either. Everything else works perfectly.

What can I do?

The model of my MacBook pro is 13' from 2011.

Thanks

Did you replace the keyboard/trackpad cable as well... these are certainly known to develop faults.

These are flat Mylar® ribbons with circuit traces—and easily damaged.

krlos90 wrote: I also tried an external keyboard and it works perfectly.

That's usually a pretty good sign that the internal one is defective. Where did you get the replacements you have tried? Really bad luck to have them all broken.

Most likely you have another defective keyboard since the issue changes with each keyboard.