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Thread: Keyboard and Power Button Problems

  1. #1
    Join Date
    Nov 2012
    Posts
    1

    Default Keyboard and Power Button Problems

    A couple of weeks ago, I turned around to notice that my 2-year old had pried two of the arrow keys from my 2009 Macbook Pro 13" keyboard. I tried to replace them, but in doing so, tore off the little silicone nipples under the keys, rendering them useless. However, the keyboard was functioning normally other than the two keys that were missing.

    I've done quite a bit of hardware repair in the past, so I attempted to replace the keyboard. When I did so, the Macbook Pro failed to turn on at all. I tried to use the power button, and tried to short the pins on the motherboard--neither solution worked. I put in the old keyboard, and it worked once more--however, a row of keys (V, F, R, 4) had ceased to function. However, the power button was once again functional. I assumed that this was because the keyboard was bent slightly as it was removed originally.

    So, I set out to replace the entire top case, including a new keyboard. However, with the new topcase and keyboard I'm having the same issue with the row of keys--they do not work--and the power button has again ceased to function.

    Being clever, I left the *new* keyboard and topcase in the system, but removed its ribbon cable from the logic board. I replaced it with the old keyboard, and the power button on that one worked just fine, and booted the Macbook up. I then removed the old keyboard's ribbon cable, plugged in the new one from the new top case, and let the Macbook continue booting.

    After boot, the new keyboard functioned--but the row of letters still did not work, and the power button still did not function. The computer is still on, and working--but I cannot use the power button at all, which means I can't actually shut this thing off and turn it back on again.

    Any ideas on what might be causing this, and how I might repair it? Do I need a new logic board? Everything else is functioning normally.

    Here's the TL;DR version:

    Old keyboard before replacement: Fully functional with missing arrow keys
    First new keyboard after replacement: Inoperable
    Replacing new keyboard with old keyboard: Power button functional, keys VFR4 not functional;
    Replacing old keyboard with second new keyboard: Power button not functional, keys VFR4 not functional

  2. #2
    Join Date
    Aug 2001
    Location
    Grangeville, ID USA
    Posts
    9,119

    Default

    I was hoping someone would have a clue. I don't know of a way to resolve your problem short of swapping in components. And that gets mighty expensive quickly. I would think you almost have to take it to a shop to test... which means they swap out components until they find the bad one.

    Rick
    molṑn labe'
    "I am a mortal enemy to arbitrary government and unlimited power. I am naturally very jealous for the rights and liberties of my country, and the least encroachment of those invaluable privileges is apt to make my blood boil."
--Ben Franklin

  3. #3
    Join Date
    Feb 2012
    Posts
    265

    Default

    First question: are you certain that it was the correct keyboard? There are a number of them to get it wrong with. You have to ensure that it's the right one or you'll get failures.

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