Introduction
After completing the Outer Shell Disassembly guide, this process will aid in replacing the HP Photosmart c4780 motherboard with minimal technical requirements.
Tools
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Unplug the device from any energy sources.
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Lift the top cover of the scanner.
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Use a plastic opening tool to remove the plastic frame surrounding the glass.
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Unscrew the screw inside the power button panel space.
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Then, unscrew the screw that is across the printer slider.
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Pull the white circuit board outwards which is located under the small screen.
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Unplug the small ribbon cable from the circuit board.
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Unplug the small ribbon cable from the circuit board. Be careful when you unplug the ribbon cable not to use too much force. Using too much force may damage or rip the cable.
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Pull the memory card reader's circuit board out.
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Detach the white wiring connector from the back of the circuit board.
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Put your finger behind the small screen.
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Then, pull it up.
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Disconnect the ribbon cable from the small screen.
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Gently remove the seven cables that are attached to the motherboard using a plastic opening tool.
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To reassemble your device, follow these instructions in reverse order.