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You know how when you turn on a regular light bulb and it burns out with a bright flash? What happens is that when the filament burns out, it breaks and bounces back and hits the other electrical post and basically shorts out causing that bright flash. Sometimes, when the light bulb in the microwave burned out, it shorted out, and caused the circuit-board trace to burn up. (This is not just conjecture; I've seen it.) If that's the case, then you would have to replace the main control circuit board. Unfortunately, a rather expensive repair for no lights. (Although the circuit board trace can usually be repaired by direct-soldering a wire to replace the burned trace. Sears repairmen won't do this, but an independent electronic technician could do it.
Light bulbIf your
microwave light bulb is not working, perhaps it has blown. The first
step is to replace the bulb and power on the microwave. If this does not
correct the issue, the next step is to check the socket and wiring to
verify if that is the problem.
Light bulb socket & main control boardIf
your microwave light bulb is not working after the installation of a
new bulb, check the light socket as well as the wiring to ensure they
are properly operating. If these sources are functioning properly, the
next step is to check for a faulty control board as a possible root
cause to your microwave light bulb malfunction.
This can start when food splatters on the inner door, then from that point the microwaves that do the cooking are attacking that splatter eventually burning a hole in the door. Do not use the microwave oven in this condition. You will need to have the door parts that are damaged replaced
Fisrt, check to be sure your missing cat it not inside the unit. IF the interior is dirty (splatters, grease, etc.) , it may inhibit the unit from working properly.
Proberly wave guide cover at side it can get grease behind it,And when you used it with small load it tried to cook it and then burned the mica cover,Take mica cover off and try it without it to seeif problem resolved if ok,New cover can be obtained if req.Regards grandadfixer
You need to stop using your microwave if it's burning. This is a common symptom of a blown magnetron. Using it in it's current condition is not only dangerous, but it will further damage other components in the high voltage circuit and/or waveguide. In many circumstances, damaging the waveguide renders a microwave non-repairable. A new magnetron will cost you around $100 if you wish to repair this yourself. NOTE: I would not recommend working in or around the high voltage circuitry unless you absolutely know what you are doing. Do not attempt to take any live voltage measurements or operate the oven with any of the protective covers removed or interlocks defeated. Voltage potentials of over 13,000 volts exist and are potentially dangerous. I hope this helps you.
typical Magnetron.
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