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Buzzing noise could be coming from the motor trying to rotate but hampered by stuck gears. Try mo lubricate yung gears then manually force the servo wiper to rotate. AVR unplugged of course.Ref pics:Wiper arm at the left, gear assembly at the rightWiper arm on top, gear assembly (not shown and may be difficult to access) at the bottom
Salamat sir Markcrenz! Try ko gawin mamaya. Baka nga WD40 lang katapat nito.