Question about Samsung SMH7178STD Microwave Oven

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Microwave make a deep humming sound ,does not heat and the circuit breaks

My microwave had been humming off and on. Samsung suggested I change the charcoal filters. Did not work Instead now the the humming is constant, nothing heats and after 14 seconds the circuit tripped ! The service center Samsung wants me to go does not want to give ne any appointment soon Can anyone tell me whats going on with my microwave Should I get a new one??????

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I would say your magnetron has failed.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

If it's within the one-year time frame, the repairs should be free.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jun 29, 2008

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Microwave makes deep humming sound and doesn't heat


Your magnetron that actually does the cooking is making that humming sound. That part needs to be replaced before it starts blowing your fuse inside the microwave. That part is the one located on top behind the control panel of your microwave and is about the size of a persons hand (sometimes smaller sometimes bigger). With everthing unplugged you can take the cover off and see it. It has some cooling fins on it and is held in place with only three to four screws. There are three to four wires that come out of it and go to only a couple of places one of them being a large capacitor that is about three to four inches long with terminals at its top. Find a magnetron at a local tv repair shop (reputable), a local electronic supply house (they can order you one) or on the internet. They cost from $25 to $60 depending on size of microwave. If you can do it yourself you can save about $40 to $50. Let me know how it goes. Good luck.

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Deep humming sound


This usually means the magnetron is failing.

Just be sure the internal cooling fan is working by making sure you feel air flow. If not, call for service right away.

The magnetron part cost is covered beyond the normal 1-year warranty, so when it gets worse or stops heating, you'll have to call for service.

To find an authorized Samsung servicer, look here.

We're happy to help and we appreciate your thoughtful rating of our answer.

Jun 04, 2008 | Samsung SMH7178STD Microwave Oven

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Dec 29, 2007 | Samsung SMH7178STD Microwave Oven

1 Answer

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check magnetron related circuit and replace magneron, check condencer, diode and etc.,

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In my professional opinion, it sounds like you have a shorted relay or other defective component on your control circuit board, which is actually made by Samsung. We regularly repair these control panel assemblies nationwide for $32.50, so the problem can certainly be fixed economically. Looking at typical microwave wiring shows it has to be the cooking relay or a device that drives that relay. Since it stops when you open the door, we can say the door switches are certainly doing their job.

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