Hi @bobcohen
I suspect that the electrical contact surface on the underside of the Start/Stop button where it comes into contact with the contact membrane strip has been worn away with use.
Unless you can find a replacement keypad for the oven (I can't find any parts at all for your model) you could try disassembling the oven to get to the keypad, disassemble it and then try coating the button's contact surface with a conductive paint to see if you can prolong the life of the oven. (examples only)
Be safety aware when working in microwave ovens. The HV capacitor in the oven can store >6000V DC for months even if the power has been disconnected for this length of time. This amount of voltage can seriously injure you. The HV capacitor needs to be discharged correctly, as soon as it can be accessed after the oven's cover has been removed and before any further work is carried out inside the oven.
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Hi @bobcohen
What is the make and model number of the microwave oven?
Is the display panel turning on when the power is connected to the oven?
crwdns2934271:0crwdnd2934271:0 jayeff crwdne2934271:0
Hi @jayeff
It's DEFY DMO350 ZM.
Ofcourse display is turning on normally. All buttons responds with a beeb except start/stop
crwdns2934271:0crwdnd2934271:0 Bob cohen crwdne2934271:0