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Introduction

The mainboard controls all of the software on the Nikon D40. A faulty mainboard can cause problems that will require a new board. This guide will show you how to replace the camera's mainboard.

  1. Remove the two visible 6.0 mm Philips #0 screws on the left and right sides of the viewfinder. These screws are highlighted in red.
    • Remove the two visible 6.0 mm Philips #0 screws on the left and right sides of the viewfinder. These screws are highlighted in red.

  2. Remove the four 6.0 mm Philips #0 screws on the left and right sides of the camera. Remove the four 6.0 mm Philips #0 screws on the left and right sides of the camera.
    • Remove the four 6.0 mm Philips #0 screws on the left and right sides of the camera.

  3. Remove the four highlighted 3.0 mm Philips #0 screws on the bottom of the camera.
    • Remove the four highlighted 3.0 mm Philips #0 screws on the bottom of the camera.

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  5. While pulling the bottom down, remove the back of the camera.
    • While pulling the bottom down, remove the back of the camera.

    • Be careful not to pull too hard on the back as it is connected via a ribbon cable. Be sure to disconnect this cable on the main board.

    • To disconnect the ribbon cable pull the small black tab upward and pull gently on the cable.

  6. Remove the solder connecting the red wire to the mainboard. Remove the solder connecting the red wire to the mainboard.
    • Remove the solder connecting the red wire to the mainboard.

  7. Desolder the 4 smaller wires near the bottom of the mainboard.
    • Desolder the 4 smaller wires near the bottom of the mainboard.

  8. Use the plastic opening tool to release the ribbon cables attached to the mainboard. Use the plastic opening tool to release the ribbon cables attached to the mainboard.
    • Use the plastic opening tool to release the ribbon cables attached to the mainboard.

  9. Remove the five 3.0mm Philips #1 screws holding the mainboard down.
    • Remove the five 3.0mm Philips #1 screws holding the mainboard down.

  10. Lift the mainboard up to reveal the final connection. Carefully detach the white cable from the board.
    • Lift the mainboard up to reveal the final connection.

    • Carefully detach the white cable from the board.

Conclusion

To reassemble your device, follow these instructions in reverse order.

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Joe Leija

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Cal Poly, Team 6-19, Maness Winter 2014 Membre de l'équipe Cal Poly, Team 6-19, Maness Winter 2014

CPSU-MANESS-W14S6G19

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What is the ordering of the small wires on the bottom? It is hard to put back together from the photos. Thanks!

Joseph Ruskiewicz - Réponse

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