Question about GE Spacemaker JVM1750 Microwave Oven

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No power have continuity at 250 vt 20 amp fusse & bottom TCO

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Hello there and welcome to fixya
This a fairly common issue with these microwaves
Normally what the problems turns out being that the fuse that sits on the controle board inside
So what you are going to have to do is first remove the outer shell this is done by removing the screws that are on the edge of the unit along the back then remove the screws on the sides then all you have to do is to slide the cover back towards the rear abnout 1/4 inch then the cover should lift off ok?
the fuse sites on the right side on a electronic board on the right side as you look at he microwave from the front
simply remove the fuse and replace it WITH THE EXACT SAME FUSE THIS IS VERY IMPORTANT then test the microwave it it now works great all u have to do is to put the cover back on and you are done ok
However if it does not work then you will have to investigate the power inverter and have it tested this part can be expensive (just to let you know ) ok?
Please keep me informed on how this is going post me a comment ok?
Best regards Mike

Posted on Feb 14, 2012

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Posted on Jan 02, 2017

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My GE JVM1540sp1ss microwave has no power after a power surge. How do I check if theres a fuse without unmounting


My video here will give you disassembly info.

There were two versions of this model made. I've uploaded both schematics.

Your oven should have a technical sheet (which has the appropriate schematic) hidden behind the grille or behind the controller.

You should check the continuity of the fuse (on the noise filter board), the "bottom TCO," the "MGT TCO" on or near the magnetron, and the "cavity TCO."

The first two can usually be checked without taking the oven down but the cavity TCO can only be accessed by removing the oven from the wall, then removing the outer cover.

Also look at the circuit board next to the small transformer for the varistor. If it's charred, burnt, or split, you will need circuit board repair, which I can do for you.

You can find your installation instructions here.

More questions? Contact me directly here.*

* always include the full model number and FCC ID number from the label on / in your microwave (or a clear photo of the tag)
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Jan 28, 2018 | GE Microwave Ovens

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My GE Model JV1540DM5Bb want come on. Change the fuses and it want still come on....


My video here will give you disassembly info.

There were two versions of this model made. I've uploaded both schematics.

Your oven should have a technical sheet (which has the appropriate schematic) hidden behind the grille or behind the controller.

You should check the continuity of the fuse (on the noise filter board), the "bottom TCO," the "MGT TCO" on or near the magnetron, and the "cavity TCO."

The first two can usually be checked without taking the oven down but the cavity TCO can only be accessed by removing the oven from the wall, then removing the outer cover.

Also look at the circuit board next to the small transformer for the varistor. If it's charred, burnt, or split, you will need circuit board repair, which I can do for you.

You can find your installation instructions here.

More questions? Contact me directly here.*

* always include the full model number and FCC ID number from the label on / in your microwave (or a clear photo of the tag)
hvm1540_jnm1541_jvm1540_older_schematic-l1w2uc1mgnmdxwxqhwe3r0vy-2-10.jpg

hvm1540_jnm1540_jvm1540_lmv1540_newer_schematic-l1w2uc1mgnmdxwxqhwe3r0vy-2-15.jpg

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Jan 27, 2018 | GE Microwave Ovens

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The power light no longer turns on, despite it being plugged in. What may be the problem? A fuse?


Yes, it can be a fuse (usually a 20-amp fuse), or it can be a thermal cutoff device (called a TCO or thermostat) that is usually located above the cooking cavity (under the outer panel).

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

Sep 18, 2014 | Microwave Ovens

1 Answer

Microwave VENT fan keeps running


I would say you replaced a good hood thermostat (or "TCO" / thermal cutout) with a new thermostat of the wrong type.
The oven cavity TCO and the magnetron TCO will read zero ohms continuity when tested.
They are "normally closed" devices.
But the hood vent exhaust fan's TCO is a "normally open" TCO or thermostat, so it should read open or "infinity" on a continuity check.
If the temperature under the microwave gets too high, the hood TCO opens, which turns on the vent fan until it cools back down.
I would bet that only your fuse was blown.

May 18, 2013 | Microwave Ovens

1 Answer

I have a magic chef MCO165UB that the LCD display is black on and the oven won't operate at all. I've checked the fuse and it ohms out. I checked across the Bottom T.C.O. and don't get con


Sometimes that is a fan switch to turn on the blower if it gets too hot when cooking on the stove top. But you say the schematic shows it should be closed. So jump it and try the unit. if it works OK then replace it.

Oct 16, 2017 | Microwave Ovens

1 Answer

I have GE Advantium 120 SCB1001 Microwave Oven. It is plugged in, outlet has power, but nothing comes on at all.


There are TCOs (thermal cutouts) which also can fail or blow, resulting in "no power" conditions.

All but one of them should be accessible without taking the oven from the wall.


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.


The full service manual is here.

You can find helpful exploded views and order GE parts here.

BUT there is one TCO which has thinner wires of a color other than black or white. This is the hood TCO and should read "open" or "infinite" which is correct.

All other TCOs should read shorted or virtually zero ohms on a continuity test, as should the fuse.


The cavity TCO is only accessible by removing the oven from the wall, then taking off its outer cover.

When taking the oven from the wall, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download GE owner's manuals and installation instructions here.


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

Jun 07, 2012 | GE Advantium 120 Convection/Microwave Oven

1 Answer

Hotpoint rvm1435 microwave: seemingly no power (no lights work, no buttons work, etc); however a voltage tester shows electricity inside the unit. I tried replacing the fuse, but that was not it...any...


In addition to the fuse, the safety devices which will render the oven dead during a fault condition are the bottom TCO and the cavity TCO.

The TCOs (thermal cutouts) have thick black wires connected to them, and they should both read "closed" or zero ohms when you do a continuity check on them.

Do not confuse the hood TCO, which has thinner red and blue wires connected to it and which are supposed to normally read "open" or infinity. If the hood TCO were bad, the hood vent exhaust fan would run all the time.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

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.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

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

Aug 24, 2011 | Hotpoint RVM1435 Microwave Oven

1 Answer

No power or lights at all. Fuse is OK, Tested circuit board and power supply on it works. Open TCO??


You can check the TCO- thermal control contact sensor.by using a meter for checking the continuity. If open then replace if not then you can check on the relay trigger, check on the circuit trigger to the relay that must switch the lights,fan and microwave.
See if the door latch switch is contacting because only when the door is latched the switch contacts to give supply to the microwave circuit.
Hope you test on these tips.

Aug 25, 2010 | Frigidaire FMV157GM Microwave Oven

1 Answer

Kid ran empty for ten minutes, got very hot, now doesn't work. Fuses seem OK.


most likely the thermal fuse ( usually calld thermal cut off orTCO) which is mounted on top of the cavity and is to protect the cavity from over heating has blown out.power to control board goes through this tco.to access this tco u have to remove the outer cover of the unit by removing all the screws th back and sides.once u have removed the cover then u can the tco at the top.it is round in shape.u can do a continuity test on it.

Aug 19, 2009 | Microwave Ovens

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FMV158FMB Just stopped working.


This may be a blown 20A fuse, open bottom T.C.O. (not to be confused with the hood TCO, which should read "open"), open cavity TCO, or open magnetron TCO.

We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.

It will give you safety info, step by step help in disassembly, troubleshooting tips, and part numbers.
They will give you safety info, step by step help in disassembly, and troubleshooting tips.

Most computers will open this document automatically, but you may need the
free Adobe Reader.

You can order parts by entering your full model number from the tag on the oven here.

Accessing some components (especially the oven cavity thermostat) for testing and possible replacement will require you to remove the oven from the wall and take off the outer cover.

If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.

You can download Whirlpool owner's manuals and installation instructions here.

Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) 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, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Jul 24, 2009 | Frigidaire Microwave Ovens

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