Question about Frigidaire FMV157GM Microwave Oven

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

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  • Frigidaire Master
  • 17,130 Answers

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.

Posted on Aug 25, 2010

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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

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

2 Answers

Kenmore Ultra Wave Microwave has no power


after removing the cover of microwave chk for continuty of cavity thermostat usually calld TCO(thermal cut off). it is located on top of the cavity and circular in shape.usually neutral wire goes through this 2 control board and this TCO is for protection of cavity from overheating.if this tco is open.then replace it.usually this happens when u cook for 2 long.

Aug 15, 2009 | Goldstar MV-1515 Microwave Oven

1 Answer

Same problem - panel out - no light


Open and remove outside panel. Inside next to the plug in (power supply) there will be a glass fuse. Look inside the fuse and see if you can see a thin metal wire running across the entire glass tube. If it does not touch end-to-end, then it should be replaced.
If the fuse is good, then you may have faulty power supply or even bad circuit board.

Jul 20, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Jvm1190 over range micro/convection oven


If the hood vent exhaust fan came on by itself, that was due to excessive heat on stove top, a failure of the hood TCO (thermal cutout / thermostat) or a problem on the control circuit board (smart board) which we regularly repair for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

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.

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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.

In this model, there are three TCOs which could be open, rendering the oven dead: The bottom TCO (not to be confused with the hood TCO, which should be normally open) the heater TCO and the magnetron TCO.

Also, the fuse should be checked in the unit.

Accessing some components for testing and possible replacement will require you to remove the oven from the wall.

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 GE owner's manuals and installation instructions here.

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

After you look into this, if you still need help, please write back with more details.

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

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

William E. "Ed" Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Feb 15, 2009 | GE JVM1790 Convection / Microwave Oven

1 Answer

ALL POWER LOST


We have the full service manual for this model and have uploaded it to our site here to help you.

You will need the
free Acrobat Reader to view or print it in case you don't have it.

The parts I would suspect most are the internal fuse, the magnetron TCO (thermal cutout) or the oven cavity TCO.

To check or replace the latter, you'll need to remove the oven from the wall and remove the 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 GE owner's manuals and installation instructions here.

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

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

Dec 26, 2008 | Microwave Ovens

1 Answer

No power


It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel, between the door switches, or inside near where the cord goes into the chassis.

If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.

Or another common problem, is surge damage on the control circuit board. We regularly repair these control units for customers nationwide with our guaranteed $39.95 service.

Feel free to contact me directly 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

Aug 23, 2008 | Samsung MW1030WA Microwave Oven

1 Answer

GE Spacemaker Microwave Blown Fuse replaced still no power


If you measure across the varistor leads with it still in the circuit, you should measure around 100-300 ohms, which is the DC resistance of the primary of the low voltage transformer.

If you read infinity / open the primary of the low voltage transformer is bad.

If the varistor is bad, it will be shorted and usually it will be cracked or split. This is a much simpler way to test the varistor.

Have you checked the magnetron thermal cutout (TCO) (or thermostat if so equipped) and the oven TCO? These are the leading causes of a dead GE when the fuse is okay.

You didn't mention the model number. What is it?

Please reply back here if you still need help.

We're happy to help you. Once we have all your information and offer a final solution, we'd appreciate your thoughtful rating of our answer.

Jul 17, 2008 | Microwave Ovens

1 Answer

Sanyo EM-710F display dead


Low voltage Tx actually OK. Restored vaporised circuit tracks on controller board, fuse and interior light globe. All working OK.

Jun 18, 2008 | Microwave Ovens

1 Answer

Ge Spacemaker microwave jvm240 wv Micro hood combo.


sounds to me like the magnatron has shorted out. i don't know of a way to test them unless you have some high dollar equipment. a continuity test prob wont tell you anything. what reading did you get on the cap when you tested it?

Jan 05, 2008 | GE Spacemaker JVM1640SJ Microwave Oven

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