Sorry, not LG, it's a Samsung fridge!
I came downstairs this morning and my fridge was really loud, still cold and good temps, but loud.
I unplugged it and searched this forum and found the reference to ice build up, so I checked and inside freezer looks fine. Everything looks OK, but not sure what to do about the rattling motor.
Noise is loud outside the fridge and seems to be coming from a fan in lower, middle part of unit.
Model # is RS2630SH