I have a 27 inch wall oven that overnight went from working to buzzing with no display.

I have looked at the two control boards sandwiched together. I can measure 5 volts and 12 volts on these boards. Does anyone have a schematic?

I have removed the jumper to the relay board ( I believe this was J2) and still cannot get the display to light up. I have read the forum about the J3 capacitor. I have replaced this with no change also.

The buzzing sound is coming from the relay board that controls the fan. Does this need to be plugged into the control boards to have a display? When unplugged from the control board the relay board stops buzzing.

Nothing works on the oven. Just buzzes and laughs at me.

Any help appreciated.

Joey