Electronics > Repair

Help identifying NTC value

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keenox:
Hi! I'm trying to repair a Corsair RM100x PSU with a blown NTC (along a blown cap and shorted MOSFET). The NTC has no markings on it. It is after the rectifiers, a coil and a diode.

fzabkar:
The diameter may give us a clue.

bte:
There's a review at https://hwbusters.com/psus/corsair-rm1000x-atx-v3-1-psu-review/3/ and the "parts analysis" section indicates the NTC is SCK-207R0 (https://www.alldatasheet.com/datasheet-pdf/view/1132411/THINKING/SCK207R0.html).

Harry_22:
Hi!
Carefully cut off the legs, gradually wipe off the soot trying to see the inscription. And finally, measure it with a tester.
Estimate the power consumption of your device. Look at the rating of bulky capacitor. Most likely there is a PFC circuit.

PS
There's probably a whole bunch of faulty parts there.

keenox:
@fzabkar: The diameter is a bit over 14mm
@bte: Wow! Great find! Unfortunately mine is a different revision, as the layout is different. The big caps are the same, but mine has 3xIPA60R190P6 (one of which is shorted) and generally worse radiators for the mosfets (no fins). You reply was very helpful nonetheless!
Harry_22: Did cut the legs, but didn't notice anything written on it. Today I looked again and managed to make out SKC 037. Coupled with bte's answer I managed to find the right one. Should I replace it with a beefier one?
Indeed there are more components faulty. In the PFC circuit there is one MOSFET shorted, the film capacitor near the NTC was blown and the 2 bridge rectifiers seem blown (no conductivity). It's weird that the main fuse didn't blow.

Looking in the datasheet provided by bte I can see that 037 is a bit underrated (820uF) for the 1150uF (680uF + 470uF) that this PSU has. Should I upgrade it to an SCK253R0 (1200uF capacitance, 14A max current)? (Just to add context, mine doesn't have a relay before the PFC, just this NTC)

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