iFixit

Have patience and follow the directions, the end result is up to you. In my case it worked. But I was a Technician TRW Automotive. and worked on Air Bag modules that was returned from customer's that needed them analyzed. I just retired after 26 years.

Remove the following 4 screws from the bottom shield:

• Two 3 mm Phillips.
• Two 7.5 mm Phillips.

Lift the bottom shield off.

Remove the two Phillips screws securing the DC-In board, removing tape as necessary.

Deroute the cable from around the optical drive, removing tape as necessary.

Disconnect the DC-In cable from the logic board and angle the DC-In board out of its compartment.

Remove the two 3 mm Phillips screws inside the left edge of the battery tray.

We recommend placing the computer on a soft cloth from this point on to prevent damaging the logic board.

Turn over the computer and open it.

Use the flat side of a flathead screwdriver to remove the small magnet covering a screw near the middle of the computer.

Remove the following 7 screws from the edges of the keyboard area.

• Three 2 mm Phillips along the right edge.
• One 4.5 mm Phillips underneath where the magnet was.
• One 6 mm Phillips with a small head in the lower left corner.
• Two 6 mm Phillips with large heads, one in the upper left corner and one in the middle.