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Early 2011 Model: A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor

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Over-sensitive keys on A1278 replacement keyboard.

I had recently purchased an A1278 replacement keyboard from iFixit to fix a space bar that had gone bad due to water damage, but was having an issue with one of the keys not working, which gradually spread to more keys, and then the whole keboard stopped working altogether. I ordered another replacement, and now I'm having different issues:

This time, the issue seems to be that several of the keys are overly sensitive. For example, the S, space bar, and arrow keys will often trigger unintended keystrokes even if I'm not pressing on them, or if I'm only lightly resting a finger on them without pressing down. I found that if I remove the keycaps, the unintentional keystrokes stop, and I am still able to press the key domes directly to use the keys. This isn't ideal, so I'm trying to figure out a way around it. I was able to remove some of the arrow keycaps from my old keyboard to get rid of the sensitivity/spontaneous keystrokes. It seems like the newer keycaps may not be the proper fit or weight for the new keyboard and are triggering unintentional keystrokes. This doesn't work for all of the keys, though - the S key still triggers keystrokes even if I'm just resting a finger on it. Swapping the space bar had an even worse effect - the old keyboard's space bar caused the new keyboard to trigger the space key continuously.

Any ideas as to how this might be fixed, or if this might be a defective keyboard?

MacBook Pro Unibody (A1278) Keyboard Görseli

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MacBook Pro Unibody (A1278) Keyboard

$19.99

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@arandomhitman @danj iFixit sent me a replacement keyboard for free. I swapped it out, and this new keyboard has similar problems. The following keys are overly-senstive and trigger as soon as I rest a finger on them:

R U H L . <space>

Would the pattern of those keys indicate any specific issue? Does the fact that they're overly sensitive rather than completely nonfunctional have any significance? My *original* keyboard had a non-functional space bar, but the replacements I've installed from iFixit have had overly-sensitive keys. Is it possible that the issue is with the keyboard connector on the logic board?

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Hi Peter,

If possible, try resetting your SMC (System Management Controller)

For more, see here: https://support.apple.com/en-us/102605

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Thanks for the suggestion! I just tried this, and it did not make a difference.

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Go to your keyboard prefs alter the Key Repeat (Off) and Key Delay (long) settings see if that does it. Then slowly move it to your preferred settings.

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Thanks for the suggestion. I will use this to mitigate the effects if I can't find a fix to the issue. It seems to be that it's a hardware problem. I'm going to contact iFixit since I purchased the keyboard from them.

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@prwood - the reason I suggested this was to help isolate where the fault is as you could have a bad connection Vs a bad keyboard.

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@Dan Just to make sure I understand what you're suggestion: I would disable key repeat and test the "problem keys" on the keyboard, and if none of the keys repeated when I was resting a finger on them (but not fully depressing them), then I would enable key repeat at the longest delay and test again, repeating with shorter and shorter delays until I find one that triggers a repeating character?

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@prwood - I wasn’t expecting that unless the extreme settings made a difference.

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@prwood - Using a straightedge see if the upper case is square and no dips as a distorted case all I can think of.

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