Back up wirelessly and create a Wi-Fi network with one device.
Inspect hidden areas on the motherboard, like an area under the speaker.
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MacBook Pro (15-inch, Mid 2009).If the LED doesnt turn on, try reconnecting the MagSave board to the motherboard and test again.MacBook Pro (17-inch, Early-Late 2011) On this motherboard the power-on pads located horizontally, on the left side from the square SMC chip (the larges square chip on the picture).If you used DeoxIT contact cleaner as mentioned in the step 5, it might leave some residue but its normal.In order to access them youll have to remove the bottom cover and its very easy.Not all liquid spills can be repaired but if you do everything correctly there is a good chance to get your computer back to life.Inspect all cable connectors for liquid damaged.
Install the motherboard into the laptop and connect the following: Video cable.
Make sure you have all necessary screwdrivers before you start: Phillips #0, Torx T6, Try-wing and Pentalobe P5 (if you are fixing a MacBook Air).
Sometimes, when you troubleshoot a MacBook, MacBook Pro or MacBook Air problem you need to turn it on without using the power button. .Inspect all connectors on the motherboard.The MagSafe board can be easily unplugged from the motherboard and replaced.Remove the hard drive and take a look at the controller board on the bottom side of the drive.MacBook Pro (13-inch, Early-Late 2011).You cannot use this method to turn on your MBP on a daily basis but it is a good troubleshooting technique.Do not short other pins.If everything works fine with an external keyboard connected but the laptop doesnt start (or doesnt work properly) with the internal keyboard connected, it means the internal keyboard failed and has to be replaced.