Clean the obvious corrosion.
Place
the MLB on a lint free towel and begin to carefully remove any visible
corrosion with a tooth brush and 99% Isopropyl alcohol. AT this point I would
take pictures of the affected areas before cleaning so you have an idea of
where to start diagnostics once the board has been cleaned.
Another sign of a Mac logic board failure involves your computer's display not coming on or behaving erratically. You might hear your computer boot up and the fan come on, but the backlight never comes on, so you clean your macbook with our Professional Engineer
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