I think I blew out my 3 pin on the mobo, help

Intel / Whitney system cr board
August 2, 2009 at 05:54:16
Specs: Microsoft Windows XP Home Edition, 1 GHz / 254 MB
I have a noisy cpu fan and a noisy crap fan I snatched from a broken xbox. They are both very noisy and only connect 3 pin. I also have a case fan that is very silent with a 3/4 pin adapter. I own two 3 pin Y splitters. Now heres this issue. I plugged one splitter on the 3 pin part of the mobo. I figured I'd plug the quiet fan, to give it the most power, on one outlet of the splitter, and use the second splitter on the other outlet. On the remaining outlet from the first splitter I attached the quiet fan since its quiet I'd figure I'd give it the most power. On the second splitter I connected both the noisy fans to give them less power so maybe they will be less noisy. Well after several times of swapping around to see what worked out the best, I turned on the computer and now I believe the 3 pin on the mobo is fried. Is there some way I can fix it to where I can give it power again or did I blow it? If I blew it I just tried connecting my quiet fan ( sense its a 3/4 pin connecter) to the 4 pin adapter and using the remaining 3 pin to power another fan and suprisingly it worked. So I'm using the quiet fans 3 pin adapter to power the other two fans at the moment. All help is appreciated.

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#1
August 2, 2009 at 16:02:08
Heres an update. I kept rebooting my computer and messing around again and now its working. Theres still a problem though. I still plugged up both the noisy fans with one 3 pin splitter and the not noisy one to a 4 pin. I'm starting to wonder if I damadged the PSU. The noisy fans are suddenly quiet, but whats weird is they keep turning off and starting up again, so thats kinda weird huh.

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#2
August 2, 2009 at 21:03:59
You probably haven't damaged the power supply, but you may have one or more connection that is loose and unreliable. Try each female socket on one pin to see whether it's too loose or not. If that's not your case, you may have damaged the mboard fan circuits. One of the three wires for each fan is an rpm readout - you're not supposed to connect the rpm readouts for more than one fan to one header, if the 3 pin header connects to an rpm sensor (some older mboards have nothing connected to the rpm pin), but it's okay to connect the two power wires for each fan to the same header.
The mboard fan circuits for a 3 pin fan header do NOT normally control the rpm of the fan or whether it is on or off.

" I figured I'd plug the quiet fan, to give it the most power, on one outlet of the splitter, and use the second splitter on the other outlet. On the remaining outlet from the first splitter I attached the quiet fan since its quiet I'd figure I'd give it the most power. On the second splitter I connected both the noisy fans to give them less power so maybe they will be less noisy."

The splitters don't split the voltage - all the fans get the same voltage - the fans are connected in parallel, not in series - they add the current requirements of all the fans connected to them together.


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