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Be careful if you decide to try and fix yourself. My screen was noisy when closing so I took it out and disassembled on the assumption I could lubricate the gears. The Open/Close & On/Off functions are controlled by a single potentiometer that seems to be calibrated, it is not a standard stepper motor! It took me a while to realign the gears once reassembled. Also, it was the motor itself that was noisy so no easy way to resolve. :-(
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