Product review (1 stars): This filter will not fit a LG Fridge 5231JA2002A. ...
This filter will not fit a LG Fridge 5231JA2002A.  The lip is not compatible with the fridge and will not lock into place.  Once you install it, it is still loose.  Once you try to use the water, the filter will pop off and flood the inside of your fridge.