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Samsung M1774 850W Heard a snap like noise. The unit comes and everything appears normal but is not cooking. The the humming noise is missing, which I relate to the cooking part.

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  • Microwave Ovens Master
  • 9,011 Answers

I would suspect that your high voltage rectifier diode may have shorted or blown open.

Here is a link you or someone you know can use to test it, but please read the safety info:
http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted and has no chips in it, it's probably fine)

You can order Samsung parts here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Nov 09, 2008

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To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms ("runs but no heat"), as well as the answers to these questions:

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Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

To allow us to help you effectively (at no charge), please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

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*Please be aware*
Replacing the Magnetron in a Microwave is a highly specialist job and should not be carried out by an unqualified person. Microwaves carry lethal levels of voltage even after they have been unplugged from the mains supply. The high voltage circuitry in this area of the oven is extremely dangerous and must undergo a discharging process before work can commence. The Magnetron itself is the main 'engine' of the microwave and operates under extremely high voltages.

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