http://forums.androidcentral.com – Hey guys, new to the site and have been learning A LOT! Recently I have been having this problem with my stock Samsung charger. I have been really careful with using it, unplugging it when its not being charged, careful not to drop it, stuff like that. Recently while charging, it makes this high pitched squealing noise. Its loud and sometimes varies in pitch, but it always does it. (HowTos)