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Old 10-20-2019, 11:53 AM   #1
cjard
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Default 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 at 11:57 AM..
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Old 10-20-2019, 04:05 PM   #2
stj
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Default 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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Old 10-20-2019, 05:01 PM   #3
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Default 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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Old 10-20-2019, 05:23 PM   #4
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Default 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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Old 10-21-2019, 01:05 PM   #5
cjard
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Default 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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