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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Power button does not work.

I need to locate the power pads on the logic board. The power button does not work after liquid spill. I want to check if is the keyboard or the logic board ( which I already cleaned with alcohol). I found some good pictures regarding this issue on this website :http://www.insidemylaptop.com/turn-on-ma... but there is none with my logic board. Thank you for any help.

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You'll find that on more recent models they stopped with the pads - from the ribbon cable connector block you have to '''short short pin 5 to pin 29 or ground'''.

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Thank you so much for the reply. I tried pin 5 and ground didn't work, either I am doing something wrong or my board is gone.

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After a liquid spill it 's quite common the board is shot. Did you clean it? Did you look for burned or swollen components? Those two steps are essential in determining if the board is damaged.

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Make sure you disconnect the ribbon cable before trying to jump the board. Also, let us know the last 3 of the serial so we can look up your model, because there may be power-on pads for your laptops.

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Dear machead3 and rdklinc,

Thank you so much both for the answers and tips. Actually after inspecting my board with a magnifying glass I discovered some corrosion on the left side of the board so I cleaned it again with 99.9% isopropyl alcohol. Now the board looks good. And because I took it a part again I have decided to order a new keyboard, so I removed the black protective membrane and everything else and now I am on the process on removing the tiny little screws that hold the keyboard in place and I am waiting for my new keyboard to be delivered. I also bought "Pure Tronics" electronic contact cleaner. On the product says that restores electrical continuity of contacts, removes oils, greases, grime, dirt, etc. and that you can apply it on integrated circuits, printed circuit boards, microprocessors etc. Do you think it is safe to spray it on the board? Did you ever used it? I am not sure if I should use it or not. The last 3 of the serial is: TY3. Really, really appreciate all the help.

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Keyboard came today, after I replaced it mac-book still dead, does not want turn on. Tried to jump start and nothing. I am not sure if it's worth it to buy a new logic board or just buy a new computer.

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The solution is:

Shorting Pin #5 on the keyboard connection (#5 from the right with battery facing up) of the logic board to a ground point will boot the laptop.

This is true for most late model macbooks and macbook pros from 2008~present.

Some models have different ways to do this, however this will work for 90% of the newer unibody laptops.

Found it from here: source of solution

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already addressed in the one year old answer.

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