No Display Troubleshooting: Control Panel Assy or Electronic Clock Control Board

We have no Display function (only beeps, no image) on our Whirlpool Double Oven. Other than purchasing both replacement parts for trial & error, how can we tell if the faulty part is the Control Panel Assy (PN#AP3131918) or the Electronic Clock Board (PN#3595759) ? Any help would be appreciated so we don’t end up purchasing the wrong – or unnecessary – replacement part.