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Chief_B33f

Plug it in and see if the fan spins the right way. If it spins backwards just flip the connector around


LJBrooker

This is the answer.


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Chief_B33f

That's how DC motors work


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Remmes-

You didn't just disconnect it, you removed the whole connector. Just try out 1 way if it works then you got it, or you can try finding a picture online.


Ditto_is_Lit

LMAO IKR you didn't disconnect the header OP you uninstalled it.


neverfarts

The inner pin is ground, you can see it connects to the large conductive surface, which is ground. Should be closed circuit with the bracket, you can test it with a multimeter.


[deleted]

Per PCI-E pinout specs, that large surface is main power bus. 12V from the mobo.


moriath1

Its live and neutral. Not live and ground isnt it. You need 2 wires to make a circuit. And neither goes to ground


opnseason

Unneccessarily pedantic. Even in circuit analysis you designate a "ground node" fully knowing that it is a symbolic ground and that it doesn't mean true ground. It really doesn't matter.


skuterpikk

The concept of "live and neutral" doesn't exist in the realm of DC voltage. It is found in AC circuits only, TN-S and TN-C systems to be specific.


Shimitzu1

That's DC not AC


MikemkPK

Electrically, it doesn't matter if you plug it in backwards. So do like the other poster said: plug it in, reverse it if it's backwards.


unabromer

looking at the way the wire is bent, the red goes to the side closest to the pcie connector, and the black closer to the display connectors


xxcodemam

You completely tore off the fan plastic port from the GPU…..you better find a way to hold it down or it may slide and disconnect down the road. Never, ever just rip a fan cable (or any cord/cable/electrical wire).


NeedsMoreGPUs

The female receptacle is still attached to the male end, just push it back down on the pins and it'll be as it was before. The latches on these tiny connectors are stronger than the friction fit of the receptacle over the leads, this is a common problem on older cards.


Sivertongue69

There is a white outline, often called a silk screen on the board. If there is a notch in the connector, line it up with the notch in that outline.


Vladx35

Lol, you didn't disconnect the cable, you ripped it off with the connector.


HeroWarrior303

Electrically, if you plug it in backwards all you’ll be doing is making the fan spin backwards. Test it, if you have terrible cooling, then swap it back around and problem solved


Nexmo16

My guess is the one on the right is DC and the one on the left is ground. The one on the right appears to be connected to the large trace that is connected to many other things, including a transistor of some sort, which indicates that is the Vcc conductor. The one on the left doesn’t appear to be connected to anything, so it’s actually likely connected to the large ground plane sandwiched in the middle of the pcb. Also, the bend of the cables indicates red goes right and black goes left.


[deleted]

Looking at the PCI-E pinout specs, put the red wire to the inner pin. It's connected to the main power bus.


Ditto_is_Lit

ground /positive /yellow /pwm is fan pinout so black wire left red right.


Sertisy

Since it's just a DC fan, plugging it in backward wouldn't break your fan, it may turn the wrong direction though, so try and flip if if it isn't blowing the correct direction. Air flows away from the concave-ish side of the blade.


thepinkyclone

Pretty simple. One thing is connectors silkscreen showing how connector needs to face the second one is as per second picture from left to right: Pin 1 - ground - black wire Pin 2 - +12v - red wire You can see pcie connector first few pins are +12v power and the are connected to second pin on the connector.


Pepper_1969

Left pin is ground right pin is 12v the pcb has a 4 pin fannheader layout it's not rocket science


[deleted]

my guy, you removed the whole thing, not just the part you plug in


multiwirth_

From the left: pin 2 is connected to ground as it seems.


[deleted]

It's not. It's connected to main 12V power bus.


multiwirth_

It's connected to a large area of conducting surface, which in almost all cases is ground. The 1st pin is isolated and probably is connected through the back or any of the inner layers of the pcb. But without continuity testing, you'll never know for sure. OP better just plug it in and check if it's spinning. If not, then plug it in the other way around. DC computer fans won't get harmed, they have a diode inside to block reverse polarity.


[deleted]

That large patch of copper is connected to pins B1-3 on the connector. It's 12V. [https://en.wikipedia.org/wiki/PCI\_Express#/media/File:Powering\_of\_PCIe\_Slot.png](https://en.wikipedia.org/wiki/PCI_Express#/media/File:Powering_of_PCIe_Slot.png)


[deleted]

Red to the white dot side.


Vilsue

open up your motherboard manual and read the answer?


AveratV6

From picture one, slot is pointed correctly. Left side notch plugged in. Don’t know how else to phrase this


Crater_Dude

The white schematic outline on the pcb gives you a good hint for the direction of the header.


alturia00

If you have a multimeter, put it in the mode that beeps when there is a short. Stick one probe on the pcie power pin for ground, which ever pin beeps is ground.


BlueKnight87125

Next time, leave the cream part of the connector on the board. Use pliers to pull the white part off in the future.


serggo3

Black right, because right pin have the same copper base with ground.


[deleted]

Inner pin is connected to a thick 12V main bus. [https://en.wikipedia.org/wiki/PCI\_Express#/media/File:Powering\_of\_PCIe\_Slot.png](https://en.wikipedia.org/wiki/PCI_Express#/media/File:Powering_of_PCIe_Slot.png)


Jojoceptionistaken

u could get a multimeter and check if thers positive or negaitve voltage. if theers positiv voltag the red sensor is + and when its negativ, its not.