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these have whats called a smart board in them. appliancepartsimages.com/dbImages/00003444/01036008.jpg" alt=""/>there are relays on the board. these relays control everything, lights fans magnetron, turntable. this is the control board. its in the control panel where you set the time on the microwave. you need to order and replace it. I am including a link to the part if you wish to replace this yourself. the part runs around $77.00. link below.