Question about GE JVM1640 Microwave Oven

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Ge md# 3670

Replaced main board and now unit shuts off because of magnetron overheating

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Re: ge md# 3670

Well its one of two things . there is a tempture sw attached to the magntron that will turn it off if it overheats . so is it the magntron getting to hot because its going bad .or is it getting to hot because the fan blade and air vents are dirty ..... only you can tell that ( if its dirty ) but you will need to take it all apart to see . ... .my guess is that the mahntron is going bad , ge has the worst set up there i have ever seen GE is BAD NEWS when it comes to microwaves . want to have fun GOOGLE " ge spacemaker problems" , and see what pops up ,everthing from no heat to burning down a house !

Posted on Jan 18, 2009

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SOURCE: ge md# 3670

Did you chceck the Triac
see if shorted

Posted on Dec 23, 2007

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What is the internal resistance of WB27x10194

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Line Fuse

Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.
Main Control Board

If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

Thermal Fuse

If the microwave is not working the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

If the microwave is not working the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.2_7_2013_10_19_58_pm.gif

Feb 07, 2013 | GE SpaceMaker Microwave Ovens

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Ge md# 3670

if you are familiar with Micro oven servicing follow these steps

.Repairing a microwave oven is a dangerous task. The high-voltage potential combined with the high-current capability of an operating microwave oven pose a deadly threat to a careless worker
1.Shorted Magnetron tube.
2.Replace Magnetron tube
3.Check Built-in surge protection on printed circuit board has opened. This circuit consists of a fine foil pattern (or filter coil - depending on the model) that acts to fuse the primary side of the low-voltage transformer.
4. Rebuild the surge protection circuit. Replace the varistor
5. Magnetron filament connectors have loosened and, due to resistive heat, the terminal connections have deteriorated and burned off.
6. Repair defective terminals as follows:Either (1) Cut away burned wire, clean the magnetron terminals, and replace the slip-on connectors, or (2) Cut away burned wire and connector(s). Clean terminals to prepare for soldering. Solder filament leads directly to magnetron terminals. Be careful not to apply soldering heat any longer than necessary
7. Check for Weakened fuse clips in the fuse receptacle causing fuse to melt due to resistive heat. Usually indicated by a bead of solder leaching out from either endcap and/or evidence of overheating (or burned spot) at the endcap, fuse clip, or terminal connection

8. Replace amp fuse and receptacle. Generic fuses and fuse holders are available at appliance and electronic part suppliers.
9. Contact service center .. all the best ..thank you

Dec 23, 2007 | GE JVM1640 Microwave Oven

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Maytag microwave overheated and shut off - Model #MMV5165BA

That is not good, the magnetron has gone, or the thermal fuse has failed, "protects the magnetron from overheating" There is a possibility the keypad control board was a affected.

Apr 07, 2012 | Maytag MMV5100A Microwave Oven

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Ge profile jes2251sj02

If it's heating and shuts down, the thermal fuse may be defective, monitors the temperature of the magnetron, or the magnetron is overheating.

Mar 23, 2012 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

The fan runs when the door is open just like it does when it's running. When the door is shut and not running the fan is off. I opend/shut the door 3 times firmly like the GE rep. told me to but it still...


Disconnect the oven from power and allow cooling down. Most GE have temperature controlled fan system.

The Fan is controlled by main pcb and powered along the line passing through the door lock switch, with circuit supplying power to the magnetron and turntable motor.

The fan is also operated directly by the control board.

If the turntable was also running, then the door switch is shorted. In that case the magnetron may be working as well, better not to start the microwave oven.

If only the fan is running, then the main pcb must be replaced, or the damper motor relay must be replaced.

Call GE and arrange repair, the unit is faulty.

Apr 26, 2010 | GE Spacemaker JVM1640SJ Microwave Oven

2 Answers

Model JVM1650WH02 will shut off about 2 seconds or less into cook time. everything else works such as light and clock and sometimes the wave will cook.

magnetron is leaking internally, do not use until magnetron is replaced. the mag creates interference with the control board and resets it

Feb 05, 2010 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

I have a GE microwave, model JVM 3670 BF03. It is an above the range unit. The unit still has power, the clock, turnstyle and fan work fine, but it no longer heats food.

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Aug 18, 2009 | Microwave Ovens

2 Answers

Same problem- microwave shuts off

You have a bad magnetron. The fact that it works when the board is tilted is the giveaway.

If you don't want to pay for the service call and prefer to do it yourself, please note the safety and parts links below:

We have *critical* safety, disassembly, and troubleshooting info at our site. You'll find a link to our site in our listing here on FixYa:

You can find helpful exploded view diagrams and order parts by entering your full model number here:

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

Feb 25, 2008 | GE JVM1650 1000 Watts Microwave Oven

1 Answer

Oven stops after a few seconds

I like the information you give.
If the unit will work with the control Panel at a 45 degree angle it tells me you have a loose connection. The 45 degree angle puts enough pressure on the connection to keep it completed. With the Control Panel in it's normal position, the loose connection Heats and Opens the connection. After it cools connection is again made until it Heats up again. Remember Expansion, Contraction. I do not believe you have a Magnetron issue!! A Magnetron does not know if the Control Panel is at an angle.
Can you hear a slight "Click" when the unit shuts down? If so this is a relay opening. When you say you replaced the Control Board. Was this the Control Panel PC Board, or was it the Cook-Relay Control Board? A Door Switch not making solid contact can do this. Is your Door latching down solid? Check for loose connections, not open LOOSE.

Jan 27, 2008 | GE JVM1650 1000 Watts Microwave Oven

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We own a GE Microwave jvm1653sh01

The first thing I would check would be the magnetron TCO (thermal cut-out). This is a little safety devise that protects the magnetron in the event of overheating. These can act up even without overheating. I believe the nuetral side of this TCO runs through the board, and therefore the flickering and shutdown. When the TCO cools, it resets. If it were the door switch, you would blow the fuse and wouldn't be able to set the time without changing the fuse. There are other cavity thermostats that could be the culprit but my quess is on the magnetron TCO. When working with microwaves always unplug the unit and discharge the capacitor. This is high voltage..Good Luck

Jun 11, 2006 | GE JVM1651 Microwave Oven

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