How to Replace the Motherboard on a MacBook

Power down the Macbook. Turn the device over. Take out the battery from the bay. This is done by the pressing of the two catches on the battery's side. Now pull up on the battery. Use the Phillips screwdriver to take out the screws on the bottom of the battery compartment. Remove the compartment.
Flip the Macbook back to the right-side position. Take out the screws on the corners of the rear of the device. Now remove the remaining screws on the three sides of the Macbook. Lift the top of the computer up. The housing will now come off the computer.
Raise the keyboard. Move it away from the computer's body. You will now see the motherboard. Disconnect the orange cord that connects the keyboard to the motherboard. Move the keyboard to one side. Take off the two wires that connect the side of the motherboard to the computer.
Use the screwdriver to take off the yellow tape located on the motherboard. Detach the gold video cable from the motherboard. Utilize the screwdriver to take off the screws on the motherboard.
Raise up the motherboard. Pull out the motherboard's power plug. Now replace the motherboard with the brand new unit.
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How to Reattach Keys to a MacBook (3 Steps)

Remove the plastic connector from the back of the key that has fallen off. The reason keys come off of keyboards is because the connectors have somehow wiggled out of place, allowing the key to fall off. Use a small screwdriver to pry to connector off of the back of the key.
Attach the connector back on the keyboard. The side of the connector with the two small holes in the corners is the left side of the connector. This will give you some orientation on how to place the connector on the keyboard. Place the connector on the keyboard so the small holes are on the left side. You will notice that these small holes line up with two metal tabs on the keyboard. Use the screwdriver push connector until the holes connect with the metal tabs.
Place the key back on the keyboard. Gently apply pressure from right to left until the key is back on the keyboard and snaps it into place. You should hear and feel the key connecting back to the keyboard. Type with the key to make sure it works properly and is fully attached.
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