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.

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.

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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.

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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.

Worth mentioning, the top circled screw was a 6mm on my camera. The other 3 were 3mm.

Mark Brown - Reply

Black Friday
Broken doesn't stand a chance.
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.

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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.

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

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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.

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

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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.

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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 Member of Cal Poly, Team 6-19, Maness Winter 2014

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One Comment

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

Joseph Ruskiewicz - Reply

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