My ranges have knobs but my oven is controlled by a seemingly simple set of 4 buttons and a 4 digit disply on a basic circuit board. Just at that vey low level

My ranges have knobs but my oven is controlled by a seemingly simple set of 4 buttons and a 4 digit disply on a basic circuit board. Just at that vey low level of computerization, the cost to fix a problem goes from $10 to $300.