I hate to have to change the time of the oven twice a year. It annoys me :P

I have a nice, cheap, small alarm clock by my bed which gets the current time over air (some sort of radio signal, probably https://en.wikipedia.org/wiki/Radio_clock ) => works great, in the past it maybe needed up to 30 minutes or so to do an initial update of its time after a change of batteries, but then it always worked perfectly.

Why aren't more appliances using that? Shouldn't even an oven, maybe having a small antenna embedded in its front, be able to get that signal?

About the only thing it's useful for is to remind me when its preheated.

I’ve run into several microwave controllers with a similar misfeature. All used the same controller board despite being different makes and models. The part that controlled the light was a plug-in board on the controller and a short in the light socket could blow a diode on it. Bad design since burnt out incandescent bulbs often fail with a short. The plug-in replacement cost ~$8, but nobody seems to stock it, only The whole controller board at ~$175.

I took out the power controller board, unsoldered the two resistors that burned and put on higher wattage rated resistors. The light sort-of works now: it makes several seconds to turn on, dunno why.

Probably the right fix would be to replace the board with a custom design with just a little transformer and a diode.