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General Forums => The O' Club => Topic started by: spitfiremkv on September 29, 2004, 02:33:33 PM

Title: adding a case fan-please help
Post by: spitfiremkv on September 29, 2004, 02:33:33 PM
I removed a case fan from an older ibm computer and can't find a place to plug it in my motherboard. the mobo has only three pin connectors and the fan has two wires.
regardless,I tried to plug the fan in and it wouldn't power up with the system.
any ideas? should there be a 2 pin connector somewhere on the motherboard? there's a connector labeled "system fan" but it has three pins as well. the fan is 12 volts, I don't know what current motherboards run at.
does it need to be activated from the bios?
I noticed that when I tried to plug my cpu fan in another similar plug on the motherboard it wouldn't start.

bottom line-do I have to buy a new fan?
Title: adding a case fan-please help
Post by: Skuzzy on September 29, 2004, 02:46:44 PM
Your two wire fan lacks the tachometer lead (center wire) which is used on all current motherboards.  This is why there are 3 wires.
I could make it work, but I am not comfortable with your level of expertise in hacking up hardware to tell you how to do it.
Title: adding a case fan-please help
Post by: AKS\/\/ulfe on September 29, 2004, 02:53:18 PM
You should make sure the connectors are getting power.

Lick them.
-SW
Maybe I should add a disclaimer: Licking electrical components is reserved for those with a very low capacity for mental prowess.
Title: adding a case fan-please help
Post by: Roscoroo on September 29, 2004, 02:55:52 PM
what you need is the 4 wire add on pigtailed connector that comes with alot of the side case fans . it plugs right into the hd/cdrom plug . I perfur to use this over taking power from the mainboard to run my fans .
 it looks like this
(http://www.coolcases.com/cart/c90_4.jpg)

you can also make your own if your electrically inclined , ive made several of them by using the old cpu fan plugs from k-6/286-486 pc's ,they have the same plug.
Title: adding a case fan-please help
Post by: lazs2 on September 29, 2004, 03:10:01 PM
fan won't start?  Bush brothers in power?   coincidence?  you decide....

lazs
Title: adding a case fan-please help
Post by: Skuzzy on September 29, 2004, 03:15:29 PM
I'll take "Alien Gas" for 10 Monty.
Title: adding a case fan-please help
Post by: lazs2 on September 29, 2004, 04:45:40 PM
skuzzy... might I refer you to the thread titled "Bush brothers-non political" ?

lazs
Title: adding a case fan-please help
Post by: spitfiremkv on September 30, 2004, 10:35:55 AM
ros, I bought a fan like that one, but it xan also be connected to the motherboard.
now-should I have it blow in or out?
the fan in the power supply blows out.
I have an emachines etower 1742, if anybody is familiar with that system.
Title: adding a case fan-please help
Post by: mora on September 30, 2004, 10:49:49 AM
Just hotwire +12V(yellow) and GND(black) from any of the several wiring harnesses, just like in the above picture. Just protect your connections properly, a self vulcanizing(sp?) tape is good. I have a similar fan on the lower backside wall blowing in, that's how I get the best air circulation.

You can use a connector like this for the job:
(http://www.biltema.fi/osteri/data/Kuvat/44_036iso.jpg)
Title: adding a case fan-please help
Post by: SOB on September 30, 2004, 11:11:20 AM
If it's mounted in the front of the case, have it blow in; if mounted in the back, have it blow out.
Title: adding a case fan-please help
Post by: Roscoroo on September 30, 2004, 11:16:28 AM
Quote
Originally posted by spitfiremkv
ros, I bought a fan like that one, but it xan also be connected to the motherboard.
now-should I have it blow in or out?
the fan in the power supply blows out.
I have an emachines etower 1742, if anybody is familiar with that system.



were are you mounting it ???

if on the front  or side of case i have them blow in

if on the back or top of case i have them blow out

you want good airflow thru the case with out disrupting the cpu's air flow (adding to it is ok )
Title: adding a case fan-please help
Post by: mora on September 30, 2004, 11:16:47 AM
Quote
Originally posted by SOB
If it's mounted in the front of the case, have it blow in; if mounted in the back, have it blow out.


I dont see how this makes any difference? there's always the power units fan(s) blowing out. There's no point in having another one blowing out. If the fan is on the back wall, then it circulates air better around the MB and the vid card.
Title: adding a case fan-please help
Post by: straffo on September 30, 2004, 11:26:36 AM
Quote
Originally posted by SOB
If it's mounted in the front of the case, have it blow in; if mounted in the back, have it blow out.


Why I'm not shocked when I read a sentence from you meaning (in resumé) : suck in blow out ?

:p
Title: adding a case fan-please help
Post by: Martlet on September 30, 2004, 11:27:12 AM
Just spend the 10 bucks on a new fan, tightwad.
Title: adding a case fan-please help
Post by: SOB on September 30, 2004, 11:35:39 AM
Quote
Originally posted by straffo
Why I'm not shocked when I read a sentence from you meaning (in resumé) : suck in blow out ?

:p

'Cause you've been dreaming about me again? ;)
Title: adding a case fan-please help
Post by: mora on September 30, 2004, 11:51:05 AM
Quote
Originally posted by Martlet
Just spend the 10 bucks on a new fan, tightwad.


You're a queen if you can't make a simple connection. Besides it's much more work to go and get another fan.
Title: adding a case fan-please help
Post by: AWMac on September 30, 2004, 12:24:37 PM
Queen eh?  very nice.  I didn't know we had a Queen.....'ow'd he get to be a Queen?

*with appologies to Monty Phython*


:D
Title: adding a case fan-please help
Post by: spitfiremkv on September 30, 2004, 01:24:49 PM
ok so I have to reverse it.

thanks for your help guys.