Product review (5 stars): not sure if this is your problem, get a screwdriver and find out.
Moments after reading about this part I found that this was indeed my problem. 4 screws and you will know for sure. The melted plastic gave it away. VERY EASY INSTALL! I followed another reviewers directions and it was just that easy! 2 tools needed 17mm socket and a phillips driver, oh and another set of hands (beer optional). It took me longer to set up an appointment with LG than it took to find and fix this problem.