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2011年後期モデル番号A1278 / 2.4 GHz i5 or 2.8 GHz i7 プロセッサー

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Why won't my MacBook Power Up?

Hi All,

My 13” MacBook Pro late 2011 was just fine until one day it was off and would not turn on.

The indicator on the charger was/is solid green, however, the charger has been tested and works on other systems.

  1. All 5 green lights flash on the battery indicator 5 times. I bought and installed a replacement battery but the symptoms did not change.
  2. I replaced the RAM with the original RAM (I installed 2x4gb the year I bought it) but the symptoms did not change.
  3. The logic board gets warm in the center when the charger is plugged in.
  4. No fans ever spin, white light on the front never comes on, and I never hear any sounds from the laptop whatsoever.
  5. There has never been water damage. I and a more experienced friend inspected the motherboard and found none.

Does anyone know what the issue may be? Is it possible that the magsafe inboard connector is bad?

Thank you all!

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Brandon Hughey  try a few of these things first:

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you also want to remember that your logicboard has some “power-on pads”. Those will allow you to start your board bypassing the button etc. They were actually intended as debug power button. Going by your computers description, your logicboard should be a 820-2936-B Let us know if this is right and if you can post some pictures of your board with your question. It will make it easier to identify. iFixitでの質問に画像を追加する方法

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This guide was very thorough and I completed the steps the best I could. I ended at 15: Replace the logic board. I couldn't get anything going when using shorting the power pads. However, just for $@$** and giggles, I tried shorting all similar pads on the logic board. I got a spark (no surprise) from shorting two pads on the Magsafe board.

It's sounding more like it's definitely a bad logic board.

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Brandon Hughey さん、ありがとうございました！
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