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Your touch panel is likely experiencing a failure. You may need to replace the control panel but there is a trick you can try first. Cut the power to the appliance. Use a hair dryer to heat the panel up until very warm while "massaging" the buttons. Often times, this will restore operation. Be sure to get the panel very warm but not hot enough to damage the plastic. If this does not work, the panel may need to be replaced. Let me know what happens, please.
The wall oven does not have a membrane keypad but individual switches on the display board. I remove the display board and used your tip I to heat the switches This I did with power connected. After a while the cooling fan started then it was possible to set time, activate all functions with oven heating etc. Then pressing on/off switch back to single blinking d/p.
Prior to this test I checked all voltage points that where marked ie (6.9 v,
5 v, and 31v) all OK. The 5v jumped to 6v when display failed.
The bad news these boards are no longer available so plan to replace the 2 electro capacitors to see if that fixes thing else a new oven.
Capacitors made no difference so bought new oven