Fan controller almost caused a (house) fire

FYI... i would check out the fan too.

Mosfets are no more prone to going up in smoke than anything else. Its possible that the fan itself is knackered which caused the excessive current draw through the transistor that made it go up in smoke. Although any product available to buy should have current limiting designed into the circuit, which in the case of a fan controller, should be rather easy to do.

Check your fan. Check it rotates as easily as it should and there is nothing stopping it from spinning, and maybe check it with a multimeter if you have one. Failing that, plug it into another port on the fan controller, if you get smoke again, chuck the fan away, or return it. Better to try it on this fan controller (assuming it works at all) than risk causing damage to something else you might plug it into later.

just my thoughts
 
Desktop yes, fan controller no.

Added to this a desktop PSU will have loads of different safety features there to protect itself and the system it's powering. A TV might just have a simple SMPS that won't have the same level of protection.

Anything that burns can cause a fire though but you'd expect that this MOSFET in question would have just failed properly eventually and either shut down the system or just gone open circuit or something. Power MOSFETs are chunky and robust and are designed to get warm, just not that warm.
 
is this the same one that arrived all bent up?
I hope all the people that said "go ahead and use it it will be fine" are feeling a bit sheepish now! :D

Yes it is the same one. If you look at the picture of the power mosfet in this thread and the one I posted when I first opened the fan controller they are exactly the same.
 
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