My MC-801 AR had problem ,such as light and food tray not functioning.LG promptly washed of their hands excuse no controller board available ! though at the beginning I believed their logic; on closure inspection I discovered a broken pcb track supplying DC power to a relay marked"main". a jumper solved /saved my US$300 investment; so much for the skill/seriousness of a korean multi national advising me to junk it! P.K.Datta . Kolkata India.