Introduction
Logitech G603 mouse wheel encoder replacement.
The encoder is a Logitech 210-001795. It's possible the PCB color on replacements is different than what's inside the G603.
Tools
Parts
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Remove magnetic top cover, batteries, and wireless receiver (if currently stored inside the mouse)
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Carefully remove the feet to reveal the 4 screws holding the top and bottom shells together
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NOTE: These feet can be removed carefully enough to be reused. Only the top and bottom feet need to be removed, not the one around the sensor
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Start at the top above the left and right click and slowly work your way around the shells until they are separated
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Be careful not to damage the power connector or ribbon cable going from the top shell's boards/battery to the bottom shell's board
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Start with the red and black power cable and gently pull it out
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Once power cable is removed, you should be able to unfold the two halves and unplug the white ribbon cable
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Remove the encoder board from the bottom shell
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Gently remove the wheel from the older encoder board
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NOTE: The old wheel can be reused in the replacement encoder board
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To reassemble your device, follow these instructions in reverse order.