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Goldstar MA-884M. What causes the high voltage diode to burst?

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  • dar5129 Mar 28, 2011

    what resistance measurements should I expect from the transformer windings?
    Is the winding to the one end of the magnetron and the capacitor suppose to link with the high voltage winding?



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I ran into this problem years ago where the diode cracked in two, because it shorted out causing it to overheat and rupture, I suspect the same has happened with yours, just replace it for normal function.

Posted on Mar 27, 2011

  • John Cunningham Mar 28, 2011

    To test the magnetron unhook the one side, if you get a low ohm reading it is good, the transformer almost never fails, unhook one side, primary will give a low resistance reading, secondary a much higher reading indicating they are okay, unhook one side of capacitor if low reading "1 ohm " it is shorted, if the meter shows a kick or charging it is probably good. To answer your question the parts are tied in together, that is why it is important to disconnect one side for accurate testing. Resistance readings vary on some parts, but in general if there is a low resistance reading "good" if no resistance reading "open" indicating it is bad.



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I have a goldstar model mv1526b microwave it has a weird hum and wont heat. Everything else seems ok.

It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.


This is a job for a professional but if you are safety clued up, here's instruction.
Make sure the !!!!any capacitors are discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

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The problem is caused by a bad magnetron, "common problem" or the high voltage capacitor and diode, all three work together to heat the food. The repair cost for parts and labor will be high enough to consider buying a new microwave oven.

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Microwave will no longer heat. Model #MA-1000W

So we can help you, please post a NEW question, and please include your model number MA-1000Was well as the answers to these questions:

When you try to microwave are the inside light, internal cooling fan and turntable all working?

Is there any unusual noise or is it louder or quieter than normal?

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are working.

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

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Goldstart Microwave Model #MV1526 1000w Everything works, but does not heat up. Goldstar MAL 783W Same problem as for another Goldstar I saw here. light comes on, turntable turns, and to answer the...

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

The service manual can be downloaded here.

Here are some links you or someone you know can use for test help, but read their safety warnings first:
(if it's not shorted or burned, it's probably okay)

To order Goldstar / L.G. parts, visit Vance Baldwin Electronics. You'll probably have to call them.

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

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You should still have about a 5-year warranty on the magnetron, if that's the trouble.

If everything else works, it's almost certainly a high voltage component, most likely the magnetron or diode, but also possibly the transformer.

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
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If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa:

I would contact LG / Goldstar first. For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit

We're happy to help and we appreciate your thoughtful rating of our answer.

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If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa:

For parts, you can contact LG at 1-800-243-0000 or

If that doesn't work, please feel free to contact me directly via and I'll help you find a replacement part.

We're happy to help and we appreciate your thoughtful rating of our answer.

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