High voltage capacitor was faulty but even after replacing it still no change
SOURCE: GE Microwave problems after HV capacitor replacement???
The rectifier diode could indeed be bad. But first I would want to know what value (in uF) the old one was and what is the value of the new one? If they're too far off, the difference in the capacitive reactance could throw off the "tuning" of the circuit. The uF value of the capacitor is optimized in relation to the other components used in the system. Of course, you'd also want to be sure your new cap is at or slightly above the working voltage rating of the old one, too.
SOURCE: Whirlpool Microwave
I would suspect the high-voltage transformer in this case, but the capacitor may be failing.
The high voltage section uses and generates voltages that can be instantly lethal.
So I don't recommend that anyone work in this area unless he has either a lot of experience or at the minimum, a good understanding of the safety issues and procedures involved.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
Also, there should also be a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
Here are some links you or a friend can use for test help, but read the safety warnings first:
http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html
We're happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: neff h7871
If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.
Here are some links you or someone you know can use for test help, but read their safety warnings first:
http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html
We\'re happy to help and we appreciate your thoughtful rating of our answer.
SOURCE: Panasonic Dimension 4 microwave switches off
Try resetting it--aka, unplug for about an hour, then plug back in and try again. If that doesn't work, make sure you try a different outlet, and if all else fails, contact Panasonic. They should be able to help you out with a repair/replacement (and if you're still under warranty, usually it'll be free!).
Their phone number (acccording to their website, www.panasonic.com ) is 1-800-211-PANA (7262)
Good luck! :)
Testimonial: "Very quick and clear, thanks."
The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.
Enter your model number to see parts for your microwave.
If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.
Enter your model number to see parts for your microwave.
If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.
Enter your model number to see parts for your microwave.
If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.
Enter your model number to see parts for your microwave.
If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food. When a high voltage transformer fails it will usually arch and have a burning smell.
Enter your model number to see parts for your microwave.
If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.
Enter your model number to see parts for your microwave.
If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.
Enter your model number to see parts for your microwave.
If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually a faulty door switch or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magn
The
high voltage diode converts the A/C power output of the transformer
to D/C, doubling the voltage to nearly 5,000 volts. This high
voltage powers the magnetron which emits the energy that cooks the
food. If the diode burns out, a lower A/C voltage reaches the
magnetron, which is not sufficient to power the magnetron. When the
diode fails it is often visibly burned out. If it appears to be
good, it can be tested with a volt-Ohm meter capable of testing
diodes. High voltage diodes frequently fail and are one of the most
common points of failure in a microwave oven. A regular meter with a
diode checker will not work to check these diodes. You have to use a
meter with a 9 volt battery or put a 9 volt battery in series with
the diode to check it.
If
the microwave does not heat, one of the door switches might be
defective. Microwave ovens normally have three door switches, if any
of them fail the microwave does not turn on and does not heat. Check
the switches for continuity with an Ohm meter.
If
the microwave oven doesn't heat the magnetron tube might have burned
out. The magnetron uses high voltage, high current DC power to
generate the microwave frequency that cooks the food. If the
microwave oven is turned on when it is empty this can cause the
magnetron to burn out. Once it is burned out it has to be replaced,
it's not repairable.
If
the microwave doesn't heat the high voltage capacitor might be
defective. The high voltage capacitor works with the high voltage
diode to convert the output of the transformer to DC voltage and to
double the output voltage. If the capacitor is burned out the entire
high voltage circuit stops working properly. The high voltage
capacitor can be checked with a special VOM meter which has a
capacitance testing capability. Be aware that the high voltage
capacitor can retain a charge of more than 3,000 volts and can
injure or kill a person if not handled properly. Only trained
technicians should perform this type of testin
If
the microwave does not heat, the high voltage transformer might be
burned out. Microwave ovens produce a very high voltage in order to
power the magnetron antenna, which emits the energy that cooks the
food. When a high voltage transformer fails it will usually arch and
have a burning smell
If
the microwave doesn't heat the thermal fuse may have blown. It can
be tested for continuity. Watch our fuse testing video for more
information.
If
the microwave doesn't heat the thermoprotector may have tripped. This
is a safety device to prevent the microwave from overheating. It can
be tested for continuity to see if it's blown.
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