Dell D810 - Latitude D820, D830 Series 15.4" WXGA LCD Screen Service Manual page 37

19. Remove the M2 x 3-mm screw from the system board support.
1 M2 x 3-mm screw
2 system board support
20. Remove the three M2.5 x 5-mm screws that secure the system board to the computer base.
1 M2.5 x 5-mm screws (3)
21. Remove the system board from the computer base.
a. Ensure that you have disconnected all cables from the system board.
b. Gently lift the board starting from the left side, and then pull to the left to dislodge the audio connectors from the holes in the base.