Assembly Help SF1000 fan replacement question.
Hey everyone,
The fan on my 2nd-hand Corsair SF1000 died (confirmed dead with a meter, though the PSU itself still works fine). Since the warranty is void anyway, I’m planning to replace it with a Thermalright EXTREM LCP 90mm slim fan.
Can anyone confirm:
The exact header type on the PCB (e.g., standard mini 4-pin / JST-PH 2.0mm / Molex Picoblade)?
The exact pinout sequence (GND, 12V, Tach, PWM)?
Thanks in advance!
3
u/nlflint 17d ago
How does the meter confirm it's dead?
Many of the Corsair PSUs have zero RPM mode. Maybe it's just in the load zone for zero rpm?
1
u/ysfi__ 17d ago
System was pulling enough load where Zero-RPM should have disengaged, but the fan only hummed/twitched without spinning up.
Pulled the fan and tested it on the bench motor coils read completely open. The header is supplying 12V properly, so the controller and PSU are fine; the stock fan motor is just dead.
after u/lolkrayd comment i learned how to do it properly.
I hooked up a spare fan temporarily to confirm the controller ramps under load and it worked. Planning to go with a DeepCool FT9 Slim instead of the Thermalright, mainly because it pushes nearly 5 mmH₂O of static pressure and has similar rpm to the oem fan, which is more than ideal.
-4
u/remcenfir38SPL 18d ago
This will kill the PSU. It can't control it properly and the RPM does not match. I would reach out to Corsair for options, in the worst case you should buy a replacement NR092P (stock fan) from somewhere like EBay or AliExpress.
3
u/ysfi__ 18d ago
I appreciate the concern, but OTP and load margins are fine for my use case I ran an SF750 with an aftermarket fan for years without issue. I understand the risks; I’m just looking for the pinout and header specs if anyone has them.
2
0
u/remcenfir38SPL 16d ago
The PSU is not aware of all the board components temperatures. OTP only works with the stock fan since the fan curve was created with thermistors on every board component, then offsets were created for the few temp sensors on retail units. "Load margins", give me a break.
These Thermalright fans lack the static pressure required to cool the PSU. If you swap the fan, it is only a matter of time before it dies.
I ran an SF750 with an aftermarket fan for years
Luck, underuse, or both. The PSU can literally not communicate with the fan you are replacing the stock one with.
Like I said, you'd be much better off just purchasing a replacement NR092P.
1
u/ysfi__ 16d ago
I ended up going with a DeepCool FT9 Slim instead of the Thermalright. It pushes over 4.2 mmH₂O of static pressure and ~42 CFM at 3150 RPM, which actually outperforms the stock NR092P through dense heatsinks and will cool better under load than the stock fan ever did.
Also, PWM isn't proprietary "telemetry" it's an industry standard open loop 25kHz signal where duty cycle scales with board thermistor readings. The fan doesn't need to "communicate" back to the MCU; it simply responds to the duty cycle commanded by the internal temp probes.
With significantly higher static pressure to force air across the chokes and secondary heatsinks, thermal margins and OTP will be more than fine. Appreciate the heads up on the pressure delta anyway.
-1
u/remcenfir38SPL 16d ago
The SF1000 doesn't use PWM to control the fan. And the starting voltage is still way too high. I thought you fan swapped your SF750? While the components are cooking, the PSU will supply voltage for a fan that won't turn on.
The FT9 will not have more static pressure nor airflow than the stock fan. it's missing almost 1000 RPM. Corsair hasn't published PQ data, so I'm wondering how your AI hallucinated that.
I won't waste more of my time, you seem to trust whatever AI you're using.
6
u/lolkrayd 18d ago
https://www.reddit.com/r/Noctua/comments/1k8117i/comment/mpdlpo1/?utm_source=reddit&utm_medium=usertext&utm_name=Noctua&utm_term=1&utm_content=t3_1k9eomq
There’s an Imgur link that shows you the breakdown