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"A" and "S" keys doesn't respond always

At first was "a", "s", "d" doesnt respont but now just "a" and "s". A repairman try hard to turn the screws small hammer and screwdriver while the computer upside down and during keyboard contact surface.

PS: Sorry for bad grammer.

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You could have a few different issues here:

  • The battery has swelled pressing on the backside of the keyboard causing the keys to fail.
  • You spilled some liquid into the keyboard causing it the corrode up.

In both cases the easiest repair is just replace the full upper case assembly. Here's the IFIXIT guide: MacBook Pro 15" Retina Display Mid 2012 Upper Case Assembly Replacement and here is the part: MacBook Pro 15" Retina (Mid 2012/Early 2013) Upper Case Assembly.

While this is a lot of work & expensive replacing the battery alone or the keyboard is still more work! I would recommend you visit an Apple Store or an Apple authorized service center to let them fix it.

Clearly, the repair person you brought your system to didn't know what was needed to fix your system.

MacBook Pro 15" Retina (Mid 2012/Early 2013) Upper Case Assembly Image

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Check the keyboard connector for any liquid damage, otherwise it will just need the keyboard. Plugging in a test keyboard will allow you to check this.

The keyboard alone can be replaced, but I would recommend giving it to someone who knows what they are doing. The rivets will need to be removed and replaced by screws, to hold the new keyboard in, otherwise the keys will be lowered and won't feel stable.

Dan's option is the easiest one if you wanted to do this yourself, but it will be a lot more expensive.

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