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crwdns2893792:0crwdne2893792:0 mcppro ,

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How to find MacBook Pro Logic Board Part Number

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I want to replace my logic board on my macbook pro Model Number A1278, Late 2011.

The board I want to replace has a number EMC 2555.  I don´t know what this number is for.  How do i find the correct apple part number.  Where is and where is the MPN number located.  I notice vendors on E-Bay use this number

I have another logic board it is a macbook pro model number a1278, late 2011, but is a EMC No.  2554.

Unfortunately, this board does not allow the display data cable to plug in.

Is EMC No. all I need to buy a logic board.

Thank You

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MacBook Pro 13" Unibody Late 2011

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open