Author Topic: kenmore/ LG microwave  (Read 192 times)

Offline jason1979g

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  • Member Since: Jul 2013
  • Posts: 154
  • Country: us
kenmore/ LG microwave
« on: July 16, 2014, 05:10:59 PM »
mod# 721.63293300

not heating making a humming noise. looking for a repair manual. never really worked on a microwave for not heating. any help would be great.

jason

Offline jason1979g

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  • Member Since: Jul 2013
  • Posts: 154
  • Country: us
Re: kenmore/ LG microwave
« Reply #1 on: July 16, 2014, 10:11:02 PM »
I think that the HV Transformer is bad. but not sure if im testing it right. here are some pics. anyone know the right testing points?

Offline wildimaginations

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  • Member Since: Jul 2011
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Re: kenmore/ LG microwave
« Reply #2 on: July 17, 2014, 05:03:00 AM »
If it's making a humming noise, there are 2 types to listen for.

If it's a humming noise that's slightly louder than normal operation, replace the magnetron and the HV diode.

If it's a humming noise that sounds like a large voltage surge, replace the HV diode.
Appliance Service Technician
Authorized servicer on LG appliances.
About 45 mins east of San Francisco

Offline jason1979g

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  • Member Since: Jul 2013
  • Posts: 154
  • Country: us
Re: kenmore/ LG microwave
« Reply #3 on: July 17, 2014, 10:50:10 AM »
I retested the magnetron and found the HV had continuity to ground. manual said should have no continuity to ground. I'll get the diode anyway.

 

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