How to disable some of the built in memory?

Discussion in 'MacBook Air' started by idonotliketostu, Nov 17, 2011.

  1. macrumors 6502

    Joined:
    Feb 28, 2008
    #1
    Which pins can I safely short to disable some of the built in memory on the 13" air?
     
  2. macrumors G5

    Macman45

    Joined:
    Jul 29, 2011
    Location:
    Somewhere Back In The Long Ago
    #2
    What?

    First, why would you want to? Second you don't specify which model of MBA? The design and system boards of the MBA changed significantly with the advent of the SSD.

    I would not want to poke around with ons on the board of a modern MBA
     
  3. macrumors 6502a

    johnhurley

    Joined:
    Aug 29, 2011
    #3
    A tablespoon of salt mixed with an ounce of h20 should do the job.
     
  4. macrumors G5

    Macman45

    Joined:
    Jul 29, 2011
    Location:
    Somewhere Back In The Long Ago
    #4
    Yes That Would Disable Everything

    Can't understand why the OP (Or anybody) would want to do it in the first place?
     
  5. macrumors 68020

    Joined:
    Mar 11, 2009
    #5
    weirdest thread award

    But srsly... why?:confused:
     
  6. thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #6
    attemp to reset efi pw on first gen air

    Any hardcore electrical engineers out there?
     
  7. macrumors 6502a

    johnhurley

    Joined:
    Aug 29, 2011
    #7
    Take it into an apple store if anyone is remotely close to you.
     
  8. macrumors 65816

    Joined:
    Jan 5, 2011
    #8
    Agreed with the last poster - you are seriously in over your (or any other Air owners) head. You need to hit the Apple store.
     
  9. idonotliketostu, Nov 18, 2011
    Last edited by a moderator: Nov 18, 2011

    thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #9

    Many things can be solved by going to the apple store. This is not one of them.
     
  10. jdechko, Nov 18, 2011
    Last edited by a moderator: Nov 18, 2011

    macrumors 68040

    Joined:
    Jul 1, 2004
    #10
    Apple seems to disagree...

    Source

    Also, consider the possible outcomes:

    You take it in to Apple, they can't fix it, they replace it.
    You try to fix it, you short out the Logic Board, you pay to have it fixed.
     
  11. thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #11
    From the genius service manual: "replace the main logic board"
     
  12. TheRealDamager, Nov 18, 2011
    Last edited by a moderator: Nov 18, 2011

    macrumors 65816

    Joined:
    Jan 5, 2011
    #12
    Whoa there - just trying to help. Shorting out random pins on your logicboard may seem like a logical and rational way to proceed to you, but you are likely alone there. Next time I'll ignore your questions rather than be called condescending and ignorant for trying to help. Good luck to you.
     
  13. macrumors 65816

    oneMadRssn

    Joined:
    Sep 8, 2011
    Location:
    Boston, MA
    #13
    I'm an engineer (albiet not with a specialty in computer hardware).

    Have you looked at the logic board where the memory is? Those pins are tiny and very close together (we're talking mils here). I wouldn't go near them with an average radio-shack soldering iron. That will likely desolder 10 pins at once, and warp the board form the heat.

    Unless you have a microscope and a very very fine-point soldering iron (even better if it's CNC controlled), then you will likely fail. If you do have access to that equipment, then you will need to track down some documentation that will explain which pins do what. There are usually two pins that need to be connected while booting to reset the EFI memory. Traditionally the motherboard manufacturer clearly labels these pins. I doubt that is the case inside an MBA. An internal Apple repair manual might have that information for debugging/refurbishing purposes.

    My advice is also to not attempt this. Even with the right equipment and documentation, you're odds of success are less than 50%.
     
  14. thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #14

    I know the layout of the logic board but not looking to desoldering a chip.

    Just need some advice on disabling it temporally whether by shorting power supply to the chip or some method keen to an engineer.
     
  15. macrumors 68020

    MacModMachine

    Joined:
    Apr 3, 2009
    Location:
    Canada
    #15
    efi password can be reset by taking a wire and connecting two tin pads on the logic board, shorting out memory will just ruin the logic board....not reset anything.


    ill see if i can locate the location on the logic board for you.
     
  16. thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #16

    sweet :cool:
     
  17. macrumors 65816

    Joined:
    Aug 3, 2009
    #17
    the rEFIt shell has a command called dmpstore which allows you the clear all or parts of the NVRAM.
     
  18. macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #18
    No offense OP but its pure stupid not to take this to an Apple store. It doesn't matter what you read in a genius service manual, that is just a guideline. If/when you screw it up you'll be out an air. If you take it to Apple and let them handle it and they screw it up, you get a new air.
     
  19. macrumors 6502a

    Joined:
    Jul 31, 2008
    Location:
    Southern California
    #19
    Maybe there's a reason why someone wouldn't want to take a machine into the Apple store... that has a password... that they do not know.
     
  20. macrumors 65816

    Joined:
    Jan 5, 2011
    #20
    Thats exactly what I'm thinking.
     
  21. macrumors 68020

    MacModMachine

    Joined:
    Apr 3, 2009
    Location:
    Canada
    #21
    only thing i can think of if its stolen....which in that case the apple store wouldn't care anyway....apple has never cared of stolen items.
     
  22. macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #22
    I thought the same thing but I didn't want to say it since I got warned recently and didn't want to risk another :p
     
  23. idonotliketostu, Nov 19, 2011
    Last edited: Nov 19, 2011

    thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #23
    Waste of time, there are no geniuses that would go out of their way and not follow guidelines. He'll be liable and probably be rebuked by the store manager. Besides, it's out of warranty and they won't even touch it unless it was a dead simple fix.

    The macbook air is already out of commission, so there are no negatives to learning and trying new things on the logic board.

    No, it's not stolen. Lay off of the skepticism.

    Lets get back on topic shall we and stop suggesting that I bring it to the store.
     
  24. macrumors 604

    chrono1081

    Joined:
    Jan 26, 2008
    Location:
    Isla Nublar
    #24
    Wow aren't you rude to people who were trying to help you.
     
  25. thread starter macrumors 6502

    Joined:
    Feb 28, 2008
    #25
    How was that rude :confused:
     

Share This Page