Question about LG Microwave Ovens

1 Answer

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

Posted by on

  • 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?

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • LG Master
  • 6,771 Answers

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.

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

MICROWAVE RUNS BUT DOES NOT HEAT


This is typical of most microwaves: the magnetron is no longer working. The magnetron provides the energy (microwave frequency) to excite the water molecules (causes friction = heating). Once the magnetron goes, you will have to get an appliance tech to replace it (along with the high voltage diode) or get a new microwave.

Apr 12, 2011 | Goldstar MV-1502 Microwave Oven

1 Answer

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.

YOUR SAFETY IS PARAMOUNT

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.


Feb 25, 2011 | Goldstar MV-1526 Microwave Oven

1 Answer

I have an old Goldstar microwave (MV1140T) that just stopped heating. The fan still works but the food won't heat up. What can I do?


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.

Feb 23, 2011 | Goldstar MV-1501 Microwave Oven

1 Answer

Our Goldstar Microwave is plugged in to a live source but, it no longer works; as if there is no power to it. MA 1080M (not the 780 M)


possibly the fuse has blown this will happen sometimes if there is excessive moisture or cockroaches or something strange in the power line the fuse used in microwaves is a slow blow fuse which usually compensates for these problems you also might have a high voltage problem or short note if you are thinking of replacing fuse if that is the problem remember microwaves work on very high voltages be aware of this if not confident please call repair technician keep me informed of the uotcome

Nov 06, 2009 | Goldstar MA-780M Microwave Oven

1 Answer

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.

Oct 11, 2009 | Goldstar MA-1011 Microwave Oven

1 Answer

Whats the wattage on a goldstar ma 7802


look on the tag on the rear cover and take your input voltage and current and multiply them for unit wattage i.e. 120 volts X 8 amps = 960 watts

Sep 26, 2009 | Goldstar MA-7802 Microwave Oven

1 Answer

Goldstar micro wave model number MVH1615WW


Could be the high voltage capacitor or the diode. Both can easily be checked with the proper ohm meter. It could also be the magnetron tube which you really cannot check. Bill

Mar 24, 2009 | Goldstar Microwave Ovens

1 Answer

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:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)

http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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.

Dec 27, 2008 | Goldstar MA-782M Microwave Oven

1 Answer

Goldstar NV1502 No Heat


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
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

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: http://tinyurl.com/yzjozk

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 http://www.lgservice.com.

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

May 05, 2008 | Goldstar MV-1501 Microwave Oven

1 Answer

Help-


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

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer (and fuse).

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: http://tinyurl.com/yzjozk

For parts, you can contact LG at 1-800-243-0000 or http://us.lge.com/support/support.jsp

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

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

Mar 05, 2008 | Goldstar MA-780M Microwave Oven

Not finding what you are looking for?
Microwave Ovens Logo

Related Topics:

47 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Microwave Ovens Experts

William Miller
William Miller

Level 3 Expert

9098 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Ross Metcalfe
Ross Metcalfe

Level 2 Expert

129 Answers

Are you a LG Microwave Oven Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...