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Thread: how do you change a magnetron

  1. #1
    Join Date
    Oct 2007
    Location
    california
    Posts
    5

    Default how do you change a magnetron

    Kenmore 721.80019400 over the range microwave...I had the repair man come out first he said the diode and the capacitator were bad so he replaced those..it still didnt work...he said he made a mistake and the problem is the magnetron. So for $250.00 he could replace it...I told him to put everything back the way it was because I can buy a new one, same exact model for $229.00. My question is...is it worth it to try and change the magnetron on my own, or do I buy a new one?

  2. #2
    Join Date
    Jul 2006
    Location
    Murray, Utah, United States
    Posts
    18,147

    Default

    The mag tube is easy to replace but the cost of the part willprobably be half the cost of a new one.
    OWNER RICK'S APPLIANCE REPAIR
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  3. #3
    Join Date
    Oct 2007
    Location
    california
    Posts
    5

    Default

    I just researched the kenmore model that I have and there are a bunch of people who have the same problem with the magnetron. One of them said that its a poorly designed magnetron. I was thinking that it might be better to replace the magnetron instead of buying a new one since I'll probably run into the same problem again. Where can I buy the replacement magnetron and how do I change it?
    Thanks for you help.

  4. #4
    Join Date
    Jul 2006
    Location
    Murray, Utah, United States
    Posts
    18,147

    Default

    There are 4 3/8" nuts holding it on and two heavy guage red wires. There may also be a thermal fuse mounted to it. Many mag tubes are the same from mfg. to mfg. Take it with you to an appliance parts store and they should be able to match it up. Be sure to have your model number with you just in case.
    OWNER RICK'S APPLIANCE REPAIR
    APPLIANCE TECHNICIAN FOR 29 YEARS
    REFRIGERATION SPECIALIST
    ONLINE SERV TECH: ApplianceBlog.com
    CERTIFIED TYPE 1; TYPE 2.....REFRIGERATION SERVICE E.S.

  5. #5
    Join Date
    Oct 2007
    Location
    Tennesee
    Posts
    51

    Default

    Check the warranty. Your MW oven was made by LG. I know LG's come with a 10 year magnetron warranty. It happened on my sister's LG MW oven at 10 months old. They Fed-Exed her a brand new one [upgraded model, more features] and I changed it out. I don't know if the same warranty applies to an LG with a Kenmore label, but it's certainly worth looking into.

  6. #6
    Join Date
    Apr 2007
    Location
    Seymour Indiana
    Posts
    93

    Default a word of caution

    Please be careful in you attempts to change a magnetron. the transformer that powers it does so with 2000 volts and draws 5-8 amps, it is deadly so if you are unsure about it, please stop now. If you frequently work around extremely dangerous voltages, then you know they don't give second chances. Having changed several mags myself i agree that if its under warrenty, you should have it changed by a tech. when i do a microwave under warrenty and any one of the highvoltage components have failed, i change them all. that's a new transformer, magnetron capacitor and diode, you don't know what else might have happened, and it's always better to be safe than sorry.

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