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The problem here is most likley within the control board that the display is on, but the part is quite expensive at $300. IF you want to attempt to repair this yourself then be sure to buy parts from a vendor that allows returns so you are not stuck with something expensive that you don't need. Repairclinic.com is one such vendor. Your problem is not common, so it may have to be solved by replacing parts as there is no diagnostic test that can pinpoint what is failing here to cause this.