Question about GE Spacemaker JVM1640SJ Microwave Oven

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Annoying "hum" in GE JVM1631WB002 microwave

I have a hum that is coming from the pwer supply/transformer on the PC Board in the unit. The replacement PC Board (part PT6078474) cast in the $125-$130 rande. Is there a way to just replace the power supply that is "humming" without replacing the entire board. At $125, let it "hum"!

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  • crecord1 Jan 06, 2009

    I think the part number above is specific to a parts website I was on. I think the part is typically referred to as the "PC ASM" by GE. I have also seen part #WB27X10257 for the panel.

  • crecord1 Jan 09, 2009

    Do you have the ability to advance ship a repaired unit and then have the old one sent back to you? That way my wife isn't without her microwave.

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The correct GE part number for the smart board (printed circuit assembly) would be WB27X10257 but I would not go to that expense.

A pretty common problem on these GE by Samsung units is a leaky electrolytic filter capacitor like the one shown in the photo.

Annoying

That's the fix, to replace the biggest capacitor, in this case.

We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Posted on Jan 09, 2009

  • William Miller
    William Miller Jan 10, 2009

    Yes, in fact I do have one. It has been refurbished and tested.

    It would run $59.95 postpaid if you'll be sending your board to me after installation.

    I can accept check, money order, or PayPal.

    Feel free to contact me directly and please remind me of your
    full model number as well as this post's URL.




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




    William E. Miller

    prototech@usa.net

    http://www.microwavedisplay.com


    P.S. I hope that will earn me a "FixYa" rating, too!

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1 Answer

I have a "continuous" humming sounding when units are heating. The sound is very loud


The humming sound that occurs may be similar to the annoying buzzing my GE microwave produces at random. It could be mechanical vibration. Doesn't seem to affect cooking.

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A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

on Feb 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

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GE microwaves are notorious for the magnetron failing, this is what generates the microwaves. Usually the unit will make a louder than normal deep hum when running if this is the case, but not always. If you have the schematic, you can measure for 120 volts leaving the control board to the transformer, you can simply measure the line in on the transformer for this. You also want to visually note that all other functions like the countdown timer, inter light, turntable, and fan are all running when you start a cooking cycle. The monitor, and interlock switches mounted on the latch assy need to be checked for continuity too. If replacing the magnetron we always recommend replacing the high volt diode connected to the capacitor and chassis ground. Pleazer Appliance...

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This is the power transformer humming, sometimes when transformers get older you get vibrations in the windings due to magnetic fields generated within the transformer which causes the humming noise, It's more annoying than anything and won't affect the operation of the microwave.

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Turns on but no heat. ? is there a fuse we can replace and where is it?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

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1 Answer

It made a loud pop while heating. Now everything works but the microwave does not heat. What is wrong and how can it be fixed?


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION

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2 Answers

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That noise you hear is loose laminations in the standby/controll transformer. It is no more than a nuisance.
The transformer can be replaced by contacting the manufacturer and browsing for a dealer near you.
Hope that helps.

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1 Answer

Contant humming noise, even when not in use have to unplug in order to stop the sound.


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To access the transformer, the microwave must be taken down and the outer cover removed. The transformer is held to the back wall of the cabinet with four screws, and there are two sets of leads with pull-apart connectors. The noise is the result of 60hz vibration being transmitted to the sheet metal from the transformer which may not have been sufficiently "potted" or otherwise mechanically isolated when manufactured. You can either replace the transformer or try wedging some thin rubber or other material between the transformer and the sheet metal to quiet the noise. Just be careful to not damage the windings!

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Chefmate microwave will not heat up anything


A microwave not heating up is caused by one or more of the following -

1) Failed controller board (unlikely if you are getting a clock readout and you can get the various functions to work, just no heat)
2) Failed door switch
3) Failed thermal fuse, when used
4) Blown power fuse that is dedicated to the microwave circuit
5) Bad diode
6) Bad capacitor
7) Bad magnetron
8) Bad transformer

Door switches insure the microwave circuit will not engage when the door is open. Slamming the door of the microwave is hard on the switch.

The thermal due is wired into the microwave harness, and is a melting allow type, based on heat buildup within the oven. Always replace with a fuse of the same thermal rating.

The power fuse is a special type and should only be replaced with that same type and rating. It is easily tested.

The diode is a relatively inexpensive part, and is not easily tested. If a grumble is heard coming from electrical area of the unit, then the diode could be shorted.

A shorted capacitor will blow the fuse immediately. And open capacitor will cause a "no heat" condition.

A bad magnetron will also cause a low level hum or grumble from the transformer. But is may also cause no other identifiable symptom of failure.

A bad transformer will exhibit a grumble or hum, and may or may not blow the fuse. But be careful here, the secondary of the transformer produces very high voltages, up to 2.5Kv. Few people own a meter capable of measuring such voltages.

Service and repair of microwave ovens is dangerous work. If you don't know what your doing, DO NOT ATTEMPT TO SERVICE A UNIT WITHOUT INSTRUCTION.

Feb 04, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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