Product review (1 stars): Not compatible as advertised
See attached picture.  Insertion cylinder on the left is LG OEM.  One on the right is Tier 1.  Note the different shape of that tab thingy.  The LG has a six-sided tab with angles.  The Tier1 has a rectangle.  It was because of that I could not insert it so the claim to be be completely compatible with 5231JA2002A is erroneous.