No boot following logic board replacement

Discussion in 'MacBook' started by tiggerntatie, Feb 26, 2013.

  1. tiggerntatie, Feb 26, 2013
    Last edited: Feb 26, 2013

    tiggerntatie macrumors newbie

    Joined:
    Feb 26, 2013
    #1
    I have a friend's 2006 macbook that died after a bad device was plugged in to the USB port (an external DVD running on an external power adapter using the wrong voltage). The macbook went dark instantly, followed by a distinct aroma of electric death from the vicinity of the USB ports. The macbook could not be roused after that, so I gambled that the logic board was fried and purchased a used replacement from a "reputable" eBay vendor.

    Long story short.. the new-to-me logic board is installed, but the macbook still doesn't do anything. What might I be missing (besides two hours from my life and $115)?

    The magsafe light goes green when it's connected. It doesn't boot either with the battery only, magsafe only, or both connected. No lights, no sounds, etc.. just nothing.

    I should add that I have also followed the SMC reset procedures that are listed on Apple's site.

    I have lots of experience tearing apart PC hardware, but this is my first rebuild of a Macbook (which, I must say, is really well designed). Any ideas??
     
  2. Brian Y macrumors 68040

    Joined:
    Oct 21, 2012
    #2
    Tried powering on by shorting the power on pads on the MLB?

    Also try that with the top case disconnected - the top case is connected via USB - so there's every chance it's been killed if it was a USB device that caused the problem.
     
  3. tiggerntatie, Feb 27, 2013
    Last edited: Feb 27, 2013

    tiggerntatie thread starter macrumors newbie

    Joined:
    Feb 26, 2013
    #3
    Thanks for that tip.. I tried to short the power pads on the board, without success.

    Thinking along the same lines, on a PC I would disconnect almost everything from the MLB, including RAM, to see if I could elicit any life from the board (expecting a diagnostic beep code, at minimum). Does this work on one of these boards? If I disconnected Wifi, drives, display data, inverter, RAM and even the magsafe board, should I expect to get some kind of noise, or even spinning CPU fan, by powering the MLB from the battery only?
     

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