I Just Replaced My Clock/timer Circuit Board In My Jenn Air D 156 Because It Was Intermittent Mostly Mittent, It Was An Easy Repair Once I Figured How To Get Into The Panel. 4 Small Screws Underneath And A Part Order From Appliancepartspros.com. If You Have No Clock But The Other Displays On The Same Display Work, The New Board Should Fix The Problem, I Have Replaced The Circuit Board Display On My D 156, And I Have The Same Problem, Mine Would Come On When You Slammed The Overn Door Sometimes. There Is A Short Somewhere In Our Oven, A Random Pounding On The Top Surface Will Recover Our Display For A Short Time, Long Enought To Set The Thermostat.... A Little Funkky When You Have House Guest. I Will Not Give Up To My Discredit.