Question about Samsung SMH7178STD Microwave Oven

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Found faulty electronic component. Don't what it's called/ If you look inside the oven and up on the cieling there is a small hole. Right above that hole is the part I need to replace.

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The part is called wave guide which you can purchase from only authorised service centre

Posted on Jun 14, 2009

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Posted on Jan 02, 2017

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Why do microwaves have little holes on the inside top, left and right? I loosen the panel near the control switches, and I can see through them to inside the microwave, while it is on. Concern?


the holes are to allow condensation and heat to escape during the cooking process
you will notice that the glass door is made up of many small holes so that you can see the cooking process
the holes are of such a size that the length of the microwave is unable to penetrate and so cause radiation outside the oven
tat is what the oven light is outside the oven proper ( behind the holes section) as the micro waves cannot get to the metal fixture
If you are still concerned , talk with a repair shop

Jan 02, 2016 | Kenmore Microwave Ovens

Tip

Microwave Oven Basic Troubleshooting Tips


If you are having problems with your Microwave Oven not working then you need to systematically go through these troubleshooting tips to figure out exactly why your Microwave does not work

The main thing to remember about microwave ovens is that they have large electrical capacitors inside them that can discharge lethal amounts of current even after they have been unplugged. Touching the wrong wire(s) inside, even after unplugging the unit can still be deadly. Make sure that you know how to discharge the capacitors or have a certified repair technician work on your oven.

The most common problem for the oven to not work at all is that the internal (thermal) fuse has blown. This fuse is there to protect both you and your appliance. It will be a simple fix for an experienced technician.

The door switch is another common problem. This switch is activated by the latch, and if it is broken the switch will not allow the oven to work.

If you can hear the oven running and it sounds normal but there is no heat then there is an internal problem with the high voltage circuitry or you may have a problem with the circuit board. Changing the circuit board or the high voltage components is something that you want experienced hands to do.

If it does heat but the power level will not change, then there is something called a triac (electronic voltage controller) that has failed. This also is a job for a qualified technician.

If the turntable stops turning, this is usually caused by the failure of the small motor that spins the turntable. This does not effect the heating but to replace this motor the cabinet needs to be open which will expose you to the hazards of the high voltage components. It is best to seek help to do this.

Intermittent heating problems are often caused by steam making condensation of the electronic components or a loose connection in the circuitry. If it is moisture the circuitry will dry out and work after some time. If it is a loose wire then it will need to be fixed by a technician.

If your unit microwave runs but is buzzing very loudly, then you have problems with the magnetron, the high voltage capacitor, or the power diode. These components are all high voltage components and need to be treated with great care. A good technician knows how to diagnose and repair them safely.

If you observe sparking inside the microwave, turn it off immediately. This can be caused by metal inside, or can also be caused by excessive food or liquid buildup. If it causes any burn spots you will need to have then repaired or fix them to have a safe appliance.

This will give you many of the basic causes for problems in a microwave oven. As you can see there is very little that an untrained person can safely do to repair this appliance.
This can however give you some idea of what to expect if you need to call a repair technician to work on your appliance.

on Aug 07, 2010 | Microwave Ovens

1 Answer

Inside oven, right side is a small panel that has a hole in it. should it be replaced....Panasonic Dimension 4...if so whats the part called


There's a grating for the interior light, and another panel a little further back for the microwave output of the magnetron. The microwave panel should not have a hole in it. That would probably indicate some kind of magnetron failure. Not user serviceable. Time to visit a competent tech and/or a service facility.

Mar 04, 2014 | Panasonic NN-T888S Convection/Microwave...

1 Answer

Don't heat consistantly micro or conv--sympthems-- no oven light no heat --occasionally ok--- ser. #113806


Hello there,

The problem could be from the power diode. A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.
Also a capacitor could be faulty. A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating or working intermittently. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.
Finally, the magnetron could be faulty. A defective magnetron is the third possible cause of why your microwave is not heating. Test your microwave's magnetron. Replace it if it is defective.
You will have to test them and replace the faulty component amongst the three factors.
Hope this helped.
All the best.
Elect_Comp

Oct 31, 2011 | Sharp R-1870 Convection/Microwave Oven

1 Answer

My microwave is making a loud buzzing sound. Inside the microwave, on the upper right side, is a square area with holes in it. It sounds like the buzzing is coming from behind those holes. Also, after...


THe buzzing noise is most likely coming from the magneton. The magnetron is the main component of the unit (it generates the microwaves). Replaceing it can be very expensive. You may be better off getting a new oven. Prices for new microwave ovens have dropped significantly.

Jun 12, 2011 | Microwave Ovens

2 Answers

Whirlpool gold accuwave system above the range microwave


Small "d" indicates door. One or more of the door switches is not closing properly or have failed. Anything from a misaligned door to faulty components...Eric

Aug 07, 2009 | Whirlpool MH7140XF Microwave Oven

1 Answer

I have a Sharp Carousel microwave model R438DV 1200 watts. There is a small 5x7 screen on the right side wall. It now has a small hole and has char marks on it. When I use the unit a fire starts o


You have to replace that small screen which is called wave guide. If there is a sharp authorised service centre near to your place you can buy the part from them. Do not work the oven without replacing that part.

May 29, 2009 | Microwave Ovens

1 Answer

KOR-630A how do disable sound?


The only way to do this is to locate the piezo sounder on the control board & remove it. However, I do not recommend trying to do this yourself, unless you are trained & experienced in high voltage electronics, as there are INSTANTLY LETHAL voltages present inside, even if the unit is off & unplugged. The sounder is a black, cylindrical device with a small hole in the middle. It will be found on the printed circuit board behind the keypad, mounted either horizontally or vertically. There will be either 2 or 3 connections to the sounder.

Jul 07, 2007 | Daewoo KOR-630A Microwave Oven

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