This resistor is from an ATX APFC PSU that connects bridge rectifier negative to primary capacitor negative
I think that it's a current sensing resistor for the APFC
Is it correct that it's color code indicates that it should be 0.47 ohms?
I measured it to be around 0.08 oms
The PSU blew up (visible arc flash) after problems with a powerstrip, but i got it working now after replacing the 10A fuse, rectifier, etc and removing/shorting the APFC diode locations and using a jumper in place of this PFC current sensing resistor
I don't think that APFC likes being connected to powerstrips, as this is not the first time that i've come across this.
Has anyone else come across a wirewound resistor that failed short instead of open?
For the sake of completeness i attached extra photos of:
the pink primary current sensing resistor, which tests in spec despite the wire being exposed (due to overheating?),
and the small chopper transformer that had a piece of the top blown off (i stuck it back on with epoxy)
I think that it's a current sensing resistor for the APFC
Is it correct that it's color code indicates that it should be 0.47 ohms?
I measured it to be around 0.08 oms
The PSU blew up (visible arc flash) after problems with a powerstrip, but i got it working now after replacing the 10A fuse, rectifier, etc and removing/shorting the APFC diode locations and using a jumper in place of this PFC current sensing resistor
I don't think that APFC likes being connected to powerstrips, as this is not the first time that i've come across this.
Has anyone else come across a wirewound resistor that failed short instead of open?
For the sake of completeness i attached extra photos of:
the pink primary current sensing resistor, which tests in spec despite the wire being exposed (due to overheating?),
and the small chopper transformer that had a piece of the top blown off (i stuck it back on with epoxy)
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