CPU fan testing

[dasr2006]

Hope someone here can help.  I need to know how to test the stock Intel fan that came with my i7-4770K LGA1150 CPU.  If the numbers on the fan are important, i can provide, just a pain to read them.  connector is 4 pin with 4 wires.  they connect to the mother board left to right - BLUE GREEN YELLOW BLACK, but they are soldered to the fan BLUE GREEN BLACK YELLOW from left to right depending on how you look at it.  I am trying to figure out if my fan is bad, my mother board is bad or my PSU.  PSU is a new Corsair RM1000X installed in June.  This fan was new (from 2013) but never installed, never used, till June of this year.  When I built this PC, I had it liquid cooled.  My pump went bad, so I tossed the fan on and it has run flawless since.   2 days ago i turned the PC on in the AM and it ran for 5 min then shut off.  Symptoms were similar to the overheating issue I had in June.  It would shut off but if I let it cool it would boot up and run for a short time.  When I tried to turn it back on this week, the PSU fan would not spin up at full RPM and the CPU fan would not turn on at full RPM before settling to around 2000RPM.  The CPU fan will just twitch.  sometimes if I flick the blade with my finger it will spin and then the whole system will boot up, now its not booting up at all.  It goes to the screen askiing if I want to boot in safe mood and when I try to boot it just restarts the pc back to that screen.  Not sure if its a voltage issue with the board, if its the fan that is bad and not letting the PC boot or if its the PSU.  I know old PSU's needed a load put on them to power up so not sure if this CPU fan sends a signal to the rest of the system to power up?  So I need to rule things out,  If I can put 12v to this fan and get it to power up on command, i know the fan is fine and i need to look at the PSU or consider the mother board as junk.

thanks

[AlHill]

Not really an Intel question, but here is your answer:

https://allpinouts.org/pinouts/connectors/motherboards/motherboard-cpu-4-pin-fan/

Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]

[dasr2006]

Hows is it not an intel question? Its their fan, their name is on it.  I realize they did not manufacture it but it could be made to their specs and the wiring colors might be proprietary.

[AlHill]

Whatever.   You have been provided the pinout which is better than colors.

Doc (not an Intel employee or contractor)
[Maybe Windows 12 will be better]

[dasr2006]

Is this fan supposed to turn on with no power/signal going to blue and green?  I want to power the fan manually for test purposes

[n_scott_pearson]

Provide ground to Pin1 and 12V to Pin2 and it will spin. Pin3 is tachometer output (provides two pulses per rotation). Pin4 is PWM control signal (fan spins at full speed if not supplied).

If the fan just twitches, then there wasn't enough power supplied on the 12V signal. This phenomenon is usually indicative of a failing power supply.

Hope this helps,

...S

[dasr2006]

After hours of Googling it appears that this fan wont kick on unless it has a capacitor/fan speed controller so unless i have proper equip or build something, its not turning on, not by suppling power directly to the ground and yellow wire.  My PSU is new.  How do we know its the PSU and not the onboard circuitry of the MB?  How can I test the PSU to pinpoint the issue?  I know about jumping the pins but which terminal is proving power to the CPU fan?