I just successfully opened my screechibg PSP, took out the screen and WD40'd the stepper motor.
Just wanted to say I feel very much accomplished and like a techie now.
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I do NOT recommend Wd40. Use Silicon grease instead. do not use any lubricant that's petroleum based.
Because the stepper motor might have plastic in it, and the petroleum based WD-40 could degrade the plastic? Also, WD-40 is more solvent than lube - it does a great job at breaking down gunky oil-based lube but not such a great job at being a lubricant itself.
Well, congratulations.