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Wrong connection of fan connector to motherboard fan header

post #1 of 4
Thread Starter 
I accidentally connected the 3-pin connector of my Storm Force 200 to the CHA_FAN2 header of my motherboard even though the header has some sort of connection mechanism to avoid this. Apparently, with a little bit of force you could connect it the wrong way. This is what happened:

Mobo header Fan connector
GND output terminal ---> (nothing, hanging)
VDD output terminal ---> minus inputterminal
RPM input terminal ---> plus input terminal
(nothing, hanging) ---> RPM output terminal

If you can imagine it properly, the fan connector moved one pin down that's why it made this connection.

Upon booting up the PC, the fan didn't work (as expected) and I waited it to boot to Windows and immediately shut it down, popped up the case open and I noticed this wrong connection and the fan wires were hot. With that, I suspect that excessive current went through the wire, to the fan, and ultimately back to the mobo. I tried connecting the fan the right way and surprisingly it worked. So what damaged did the hot wire do to my fan and if ever to any other component of the motherboard?

The only thing that is not working right now is the voltage control of CHA_FAN2 and CHA_FAN1. The CHA_FAN1 header was also damaged. Before this incident, the voltage control worked properly both in the UEFI and in Windows using ASUS AI Suite II. Now it seems that the two chassis headers only provide full +12V to the fans connected to it.

Are fan headers isolated from each other in such a way that if one is damaged by things like this accidental connection the others won't be damaged?

Also, can anyone explain why that connection caused this damage to this system? I spent hours thinking why it happened but can't find the answer. I mean the VDD and GND of the motherboard header weren't even shorted.

Thanks for your help
post #2 of 4
Thread Starter 
Anyone can shed a light on this?
post #3 of 4
Accidently forced it to fit?
Brulf
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Brulf
(20 items)
 
  
CPUMotherboardGraphicsRAM
i5 4690k ASUS Z97-Pro [WiFi- ac] Gigabyte GTX 980ti 2 x 4GB Corsair Dominator 
Hard DriveCoolingCoolingCooling
Samsung 840 120GB SSD EK-Coolstream PE 360 EK-Supremacy EVO EK-FC Titan X 
CoolingCoolingCoolingCooling
EK-Xtop D5 Vario EK-Res X3 150 Monsoon Compression Fittings PrimoChill PrimoFlex Advanced LRT Tubing Clear 
OSMonitorKeyboardPower
Windws 8.1 64bit Samsung S27D590 Ducky Shine 3 EVGA Supernova 850 G2 
CaseMouseMouse Pad
Corsair 800D Logitech g502 Mionix Sargas 900 
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post #4 of 4
Thread Starter 
Quote:
Originally Posted by Brulf View Post
Accidently forced it to fit?
Yep. I didn't know because the fan I was connecting was the side panel fan and when I connected it I didn't noticed that it was fitted in the wrong manner because I felt the "snap". I just used very less force that's why I didn't noticed that I had it connected wrongly. This was the first time that something like this happened because usually I'm very careful with things like this.
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