After completing the Outer Shell Disassembly guide, this process will aid in replacing the HP Photosmart c4780 motherboard with minimal technical requirements.

Shut the device off.
  • Shut the device off.

  • Lift the top cover of the scanner.

  • Carefully, pry the plastic frame surrounding the glass away from the printer hood using a plastic prying tool.

  • Pull the frame out.

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Unscrew the two screws that fasten the frame to the printer hood. Use a T10 screwdriver
  • Unscrew the two screws that fasten the frame to the printer hood. Use a T10 screwdriver

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  • Pushing the clip behind the cover piece in, pull the cover piece outwards.

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  • Remove the two screws on the front of the printer with a T10 screwdriver.

    • The first is inside the power button panel space and the second is across the printer slider.

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  • Pull the circuit board from the power button panel space.

  • Unplug the small ribbon cable from the circuit board.

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  • Pull the memory card reader's circuit board out of its slot.

  • Detach the rainbow connector from the back of the circuit board.

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  • Press the clip directly behind the TouchSmart panel and pull the panel up.

  • Disconnect the ribbon cable from the TouchSmart panel. This detaches the panel from the printer body.

  • Do not hesitate to use force to remove the TouchSmart panel.

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  • Grip the printer hood and pull upward.

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  • This guide requires completion of the Outer Shell Disassembly Guide.

  • A T10 Torx Screwdriver will be needed for this step.

  • Locate the motherboard and remove the three uncovered screws.

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  • The Plastic Opening Tool will be useful in this step. Motherboards are fragile so be careful not to damage it with any further removal.

  • Gently remove the seven cables that are attached to the motherboard.

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  • Gently lift motherboard out of the slot, removal is complete.

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

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garrett hall

Member since: 09/26/2012

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Cal Poly, Team 2-11, Propen Fall 2012 Member of Cal Poly, Team 2-11, Propen Fall 2012


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