Microwave problem Samsung over range microwave SMH7198STD: When I start it, there is a distinct buzz just behind the touchpad and the over cooktop light comes and wavers in brightness for different lengths of time then after usually 10-15 seconds the buzz quits and the light goes out and everything works normally. Once I used the beverage button and the same thing happened except it shut down and gave E4 message. I left unplugged for an hour once and for four hours once but problem persists. Any ideas?

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William Miller

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Is it possible that grease or moisture got into the controls? This can happen when cleaners are sprayed directly on the keypad; when boiling is done on the stovetop without the hood vent fan being on; when the hood vent filter is clogged; or due to restricted airflow in exhaust. The best way to check the airflow is to turn the hood vent fan on and use your hand to feel at the exhaust outlet outside the home. Moisture can cause the keypad or control board to short to some degreee, and produce odd results. It may clear up, but sometimes it requires that the keypad be replaced or that the board be professionaly cleaned. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk We also repair microwave control boards for customers nationwide for $39.95. Feel free to contact me there directly if you have further questions.

Posted on Jun 17, 2007

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That's almost always a defective filter capacitor on the control circuit board.

We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.

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