Question about LG LRM1250 Microwave Oven

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No heat in microwave oven

How i can check capicitor of microwave oven

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  • Anonymous Feb 09, 2009

    light turns on turntable turns but it just does not heat

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  • LG Master
  • 8,872 Answers

If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

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/cap_test.html

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

Posted on Nov 23, 2008

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My Kenmore elite built in microwave oven model 790 488 03100 has stoppped heating what can i do


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NO HEAT FROM MICROWAVE


use the common sense,clearly, logically, and fix it .God bless you
can take some time. This is where you must be able to read a wiring diagram and do some "live" checks on parts. First easy check is to make sure power is coming off your control board at the MW relay. Make sure of the wires and test here, if you have 120 volts at this point, you have ruled out a lot of parts that could be the problem. You have now ruled out any switch problems, control board problems, or a thermostat or 2.If you do not have power from that MW relay on the control board, you must trace the wiring back to see if the proper voltage is going through your switches, any thermostats, and arriving at your control board. Your wiring diagram on your sheet will show you where and what to test. Below is a general switch test troubleshooting guide.

mwswitchtest.jpg mwswitchtest2.jpg If the proper voltage is coming into your control board and you are not getting voltage at the MW relay, then you need to replace the control board. If voltage is interupted by a thermostat or switch from your testing to the control board, then replace that part.Now, testing from the MW relay on to your transformer, high voltage capacitor, magnetron, and diode. Do not do any voltage reading from the secondary side of the transformer on, this can be a deadly microwave oven repair if you do not follow directions. This can result in electrocution and the "blowing-up" of your voltmeter, only do OHM testing with the power off and the capacitor discharged. Someplace in this circuit, usually before the transformer, you will have another thermostat to test. It is usually mounted on the magnetron. Do a quick OHM test to see if it is open or closed.
Now to test either the transformer, high voltage capicitor, magnetron, and diode, you must test each part separately. A good rule of thumb, if your capacitor is bad, change the diode also. Another note, if you are working on an OTR model and you have determined to be one of these "heating" circuit parts, you can not test these parts until you take the unit down. If you don't have the parts with you and you have to order them, order the magnetron, capacitor and diode and you will have a 90% chance of solving the problem. If it is an older microwave, order the thermostat also, most times you can return un-used, un-opened parts. Check with your parts supplier. This way you only have to take the unit down once.
To test these parts, scroll down this page and you will see a chart with component tests. Follow the instructions to find which part(s) are defective in your microwave oven repair.


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No Heat


ALL functions work.... just no heat? Is that right? I am assuming that the control (computer?, relays?) ARE supplying power to the magnetron.

IF everything checks out as you say, is the magnetron filament O.K.? (You have to disconnect it from the transformer to test it.)

If the magnetron transformer draws 8 amps, it sounds like it's O.K. cause if it was shorted, it would blow a fuse, and if it was open, it wouldn't draw ANY current.

Check it out, tell me more and let me know. No heat means the Magnetron isn't working.

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