How to Replace the Logic Board in a Macbook Pro

Turn your Macbook Pro off and flip it over. Remove the battery from its bay by pressing the two catches on either side of the battery compartment (in the middle of the bottom of your Macbook Pro); then lift out the battery.
Remove the three screws at the bottom of the battery compartment with the Phillips-head screwdriver and lift out the compartment.
Turn your Macbook Pro right-side up and remove the two screws on each corner of the back of the computer. Then remove all the screws on each of the remaining three sides of the computer. Gently lift the top of the Macbook Pro up until the housing comes away from the computer.
Lift the keyboard up by its corners and away from the body of the computer to reveal the green logic board. Detach the orange ribbon connecting the keyboard by gently pulling it loose from the logic board. Place the keyboard aside.
Remove the two wires connected to the sides of the logic board from the computer by inserting the tip of your flat-head screwdriver under the wire and gently lifting upward.
Remove the yellow tape from the top of the logic board with the tip of your flat-head screwdriver. Disconnect the thick gold video cable from the side of the logic board.
Remove the 10 screws on the logic board (eight on the sides and two in the middle) with your Phillips-head screwdriver.
Gently lift the logic board up and remove the power cable from the left side of the logic board by gently pulling it out. With the last connection unplugged, remove the logic board and replace with the new one (available at your Apple retailer or online). Reassemble your Macbook Pro in the reverse order you took it apart.
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How to Test a Power Adapter on a Mac (6 Steps)

Connect the 'Magsafe' end of the connector to the power supply port on the left side of the Mac laptop. Connect the two-pronged power supply to a wall outlet or power strip. The light on the 'Magsafe' connector end should light up. If it does not, proceed to Step 2.
Verify a secure connection. Gently pull out the Magsafe connector, then reconnect it to the laptop. Wait a few seconds for the status light to come on. If it does not, unplug the power supply and try another wall outlet or power strip outlet.
Turn on the laptop. Once the Mac OS X desktop loads, click the 'battery icon' in the upper right of the screen. Look for either 'Battery is charged' or 'Battery is charging' in the drop-down menu. If you see neither of these phrases, proceed to Step 4.
Unplug the power supply again from the wall outlet or power strip. Verify that the 'adapter' plug on the end remains securely in place. The Apple power adapter has a removable plug that allows you to connect the Apple power supply extension cable; check that the removable plug remains firmly in place.
Reconnect the power supply plug to the outlet. If the status light still does not turn on or the 'battery icon' does not indicate a fully charged battery or charging battery, proceed to Step 6.
Unplug the 'Magsafe' end of the adapter from the computer. Reconnect it to another Mac laptop. Note that some Apple adapters have different 'Magsafe' plugs, including barrel-shaped, T-shaped and L-style plugs. Verify that your adapter matches the power supply port on the second Mac laptop before connecting. If the second laptop begins charging, the issue lies with the first laptop and the adapter is functioning properly. If the second laptop fails to begin charging, you'll need a replacement power adapter.
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