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Power supply board from a ventilation unit - burnt out something

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    Power supply board from a ventilation unit - burnt out something

    This vent axia ventilation unit stopped working and I pulled the power supply board hoping it was the internal fuse. Seems this other component might be to blame but what is it? It looks like a capacitor to me but next to it on the board is printed RV1 whereas a physically similar component at the other side of the board is labelled C15...

    Any ideas guys?
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    Last edited by cjard; 10-20-2019, 10:57 AM.

    #2
    Re: Power supply board from a ventilation unit - burnt out something

    the big cap in the picture looks bulged.

    the device may be a resistor to limit inrush - have you checked for shorts?

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      #3
      Re: Power supply board from a ventilation unit - burnt out something

      looks like a stand in for lack of a fuse . guessing there is a short after it

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        #4
        Re: Power supply board from a ventilation unit - burnt out something

        Check if RV1 is inline with the a/c line or is across the a/c between line and neutral, It could be a inrush ntc thermistor if in line or a MOV if it is across the line, clean it off, you might see a number on it.

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          #5
          Re: Power supply board from a ventilation unit - burnt out something

          My neighbor has the same device as I pulled this board from, so I'm gonna take a look at the components and see if I can see anything on them, writing wise

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