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Fried my CPU Fan Header - help!!!

P

petreza

n00b
Joined
Feb 16, 2006
Messages
52
Hi,

I think I fried the CPU fan header of my Inspiron 560. I have to press F1 each time I boot to bypass the CPU fan failure warning. This is annoying but the bigger problem is that I am running a service on the computer which I constantly need. Hence, the computer is running all the time. It is setup to automatically boot after a power failure but then it would get stuck in POST. I checked the BIOS for options to ignore the fan RPMs but there were none. Also, I upgraded to the latest A06 version but that did not help.

Here in what happened:

I had to upgrade the cooling of the CPU with one of those pre-assembled, pre-filled water cooling kits (Thermaltake Water 2.0 Extreme). It is using the CPU fan header for power for the pump/water_block and the two 120mm fans for the radiator. The pump connector has 3 wires (all black). The CPU fan that I removed has 4 wires: black, red, yellow, blue. When I plugged the pump wire into the CPU fan header, despite the little plastic guides, I managed to shift the wires one over like so:

Code: 
FAN        PUMP
HEADER     WIRE

black------
red--------black
yellow-----red
blue-------yellow

The pump did not work. Realizing my mistake I plugged it in the right place but it did not help. Now even the original fan does not work. I even tried spinning the fan with my Dremel at boot time to give the system feedback but no go.
In order to get the pump working I had to unplug the case fan (3-pin) and plug it there. It appears the pump does not provide rpm feedback because now I get both CPU and CASE fan failure.

Interestingly, the CPU fan header is not electrically dead. I measured the voltages between the black wire and the other three and got:
black-red = 12V
black-yellow = 5V
black-blue = 1V
(approx)

To eliminate the possibility that the CPU fan was damaged in the process too, I plugged the case fan in the appropriate 3 wires of the CPU header and it did not work. Also, I plugged the CPU fan in the Case Fan Header and it did work there.

Any ideas how to fix this problem will be greatly appreciated.

Thanks!
 
it happened to me looooong time ago in a HP DX-2400 machine.. i'd installed wrong the 4pin CPU fan and shorted it.. in fact the original intel Fan smoked it.. and was unable to work again just died, the board until this day its working, but its working wrong, CPU fan its at full speed all the time, no matter what kind of fan i use 3 or 4 pin even older 2 pin, just doesn't work good, all are at full speed (which its loud certainly for those kind of 775 OEM fans..) no
 
It's possible that the header could still read RPM's, but not be able to power the fan. Mod the cable so you power directly from the power supply, and plug the yellow cable alone into the motherboard. Might not work, but it's worth a shot.

This little adapter would do the trick:
Panaflo 4-Pin Tail w/ Separate RPM
 
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