Question about GE Spacemaker JVM1640SJ Microwave Oven

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Periodically the VFD display will start to flicker while cooking, usually resulting in it resetting - stops cooking and all the VFD elements light up. It won't restart a cook cycle until I set the time and date. When this occurs, it usually repeats on the next attempt. Coming back a few hours later, it usually works again.

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  • GE Master
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See this FixYa solution, even if your model number is different.

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

Posted on Jan 01, 2011

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My microwave stopped working you can input time but when you push start nothing happens it has power and everything just will not start its like the start button does not work


Possibly a bad door switch behind the holes where the latch hooks go into. Usually with the bad switch the timer counts down but nothing runs. It all depends on which switch is bad. Usually 3 switches inside.

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GE spacemaker microwave turns off during cooking and display goes black


Step 1:


Door Switch




If the microwave runs for a few seconds and then shuts off, a door switch might have failed intermittently. Check each of the door switches for any signs of overheating, arcing, or burning. Also check each of them for continuity. Replace any of the switches that is visibly damaged or that only has continuity intermittently


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Step 2:

Main Control Board




If the microwave runs for a few seconds and stops there may be a short circuit in the main control board. Check other components first, these boards are often misdiagnosed.


Touchpad and Control Panel




If the microwave runs for a few seconds and stops the touchpad and control panel might be defective. There are several other components that can cause this problem, be sure to check any other components before replacing this board.

Touchpad




If the microwave runs for a few seconds and stops the touchpad might be at fault. This is not common. Generally speaking, if the microwave display is working and some of the buttons respond correctly but some don't, the problem is with the touchpad.

High Voltage Transformer




If the microwave runs for a few seconds and stops the high voltage transformer might have an intermittent short. This is not common. Check other components related to the microwave symptom first.

Thermostat




If the microwave runs for a few seconds and stops the thermostat might be defective. Watch our video on testing thermostat

Step 3:

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Step 4:

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use the DVOM tester and fix it. God bless you

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Sharp R-1510 1000 watts microwave, not heating


Sounds like the inverter (power supply for cooking) or the magnatron which does the work----neither are cheap parts.

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Microwave doesn't start but the interior light goes on when you hit the start button


Hello

Remove the plug from the wall outlet and wait about 10 seconds before re-inserting it. The plug must be firmly inserted to transfer electricity to the appliance.


Open your home's circuit breaker box and reset the breaker if it has tripped and is set to the "Off" position. Simply slide the breaker over to the "On" position to fix a breaker that has tripped.


Plug a different appliance into the same outlet to make sure the outlet you are using is functional. Plug the microwave into a different outlet to see if this yields different results.


Press on the microwave door to ensure it is completely closed. The microwave will not function until the door is fully shut.


Press the "Start" pad on the display panel after setting the time. Failing to press this will result in the microwave not knowing that it should start.


Press the "Stop/Reset" pad on the panel if a program different from the program you want to run has already been entered into the system.


Press the "Clock" pad three times to turn off the demo mode. The demo mode will not allow the appliance to turn on and cook as it should.

Oct 04, 2011 | Microwave Ovens

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My Maytag microwave (MMV4205BAS) display lights are dim. What should I do?


It may be a weak VFD tube or it may be that the rear of the display window and front of the display glass are very dusty.

Sometimes you can clean it inside to brighten it up.

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Then you can detach the keypad connector (as per attached photo) then remove the control panel screws.

Be careful not to crack the glass display when handling it, or it's a goner.

Then you can use a soft cloth (not a paper towel) and a mild cleaner (not ammonia-based) to clean the front surface of the VFD display glass and the rear side of the clear bezel (display window) that's attached to the keypad.

Direct spraying of cleaners on the keypad and steam from the cooktop can damage the controls.

I always recommend that you spray non-ammonia cleaner on a soft cloth (not a paper towel which can scratch) and gently wipe the keypad.

40716d4.jpg

If that cleaning didn't help, then you have a weak VFD.

On this model, the VFD is not available, so you would have to order a new circuit board for it.

You can find links to helpful exploded view diagrams and part ordering help here.

I'd recommend that your bookmark this link to your favorites.


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

Aug 05, 2010 | Maytag Microwave Ovens

1 Answer

Mvp overstove micro display dim any way to brighten up


It depends...

If the display is a VFD type, and if a new VFD tube is available as a separate part, then it can be replaced for $39.95 plus parts. We do that.

If it is an LCD type, the backlights can be replaced. We do that, too.

If it's a VFD type but the VFD tube is not available as a separate part, they can usually be brightened up a little.

You would need to remove the control panel assembly, then take the circuit board out of the frame.

(At our site, we have a video available showing how to remove a typical control panel assembly in under 5 minutes)

Then use a soft cloth (not a paper towel) with a non-ammonia cleaner and wipe off the front of the glass VFD and the rear of the display window in the plastic frame.

Feel free to contact me directly with your brand and model if you would like me to check into a new VFD tube for yours (if so equipped).

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

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LCD not working


In most cases, these are VFD type not LCD type. In any case, when a VFD fades over time, that is aging.

Unfortunately, GE does not make the VFD displays available as a separate part, so the only option is to replace the entire "smart board". And they can be expensive at times. But if you do it yourself, you save a lot on labor.

If you or someone you know decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a very helpful "mini-manual" hidden inside the unit behind the control panel.

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

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1 Answer

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Not sure about the Neff brand, but in general you'd want to check for 110VAC power on the primary side of the low voltage transformer on the control panel / board. If that is present, check the secondary for voltage, about 12-30VAC. If the unit has a VFD type display, there will be a heater filament supply, usually around 2.5-6VAC. Also look for bad connecitons on the VFD. If those voltages are present, check connections on the board, look for bloated / bulging capacitors, shorted diodes, breaks in the board, etc. Also look for thermal cutouts and thermostats. If this doesn't fix it, can you take several photos of the inner parts and circuit boards?

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