Question about Samsung SMH7174BC Microwave Oven

1 Answer

Lights flash and crazy display

After 5 to 10 seconds of use, the lights flash on and off. The display flashes funny (*#@%etc) symbols, unit stops working, and gfi outlet on opposite wall blows.

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  • Nanatutu May 29, 2008

    My problem is very similar. After a few seconds, the lights flash with crazy symbols, ove stops working. Display goes to 0 eventually.
    I have tried unplugging for 10 seconds or more...still doesn't work.


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  • Samsung Master
  • 9,047 Answers


(If yours is not a Samsung, please reply back with your brand and model!)


Sadly, we hear of this over and over.

This is due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.

If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.

It may also need a new high-voltage diode and stirrer, and the cavity may be affected.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa.

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.

They may even send you a replacement magnetron.

You can order Samsung parts here. You can find your nearest Samsung-authorized service center here.

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

Posted on Sep 06, 2008

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Posted on Jan 02, 2017

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