I need a 70MM fan with 4 wires (red, yellow, blue and black) and a connector with 4 openings. I've looked EVERYWHERE but can't find one except on the eMachines website, but it's out of stock til March. If anyone has any suggestions I would appreciate it.
(I've found some with 3 wires or 3 openings on the connector)
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the four wires will be 0V, 12V (from supply), and a sensor to sense speed (I think this is a voltage o/p proportional to the fan speed). The fourth wire with be the PWM signal to control the fan speed (input to the fan)
see Motherboard CPU 4 Pin Fan Connector Pinout AllPinouts
four wire fans almost always have the same connections. There should be a black wire on the connector at one end. This the 0V The next one is called 'sense' and is a signal giving the fan speed. The third one, often with a red wire, is the +V line (?48V in this case I think). The fourth one controls the fan speed and carries a signal from the computer to the fan causes it rotate at a given speed.
ok in the pictures of this fan I have found the wires are not the same colours as I have mentioned above. I think the ordering is the same though - but I am less certain now. blue is speed sense, yellow is +48V red is speed control ??. You can check this by (carefully !) measuring the voltage between black and yellow wires; if it 48V then my pin assignments are more than likely correct. Or if you have your motherboard manual the pin assignment for the fan's connector should be in that.
The reason for this pin assignment is so that you can use a 4 pin fan (often 12V) with a three pin power connector: the speed control is simply not connected.
sounds like a driver issue if you are having trouble
with your drivers here is a general look at
the drivers and how to update them if your computer came with
a motherboard disc the drivers could be on it click start control panel
administrive tools ,computer management ,device manager look through all
of your devices if you see a yellow question mark?or exclamation mark
! or red x right click to reinstall
drivers or if you can see your usb but
its not working ports(com&lpt)right click update
driver hope this helps
Usually the red is +12 volts DC, the black is ground, the yellow is the tach sensor, and the blue is speed control. The fan will run at full speed off the red and black. The yellow and blue are of no use unless the motherboard is designed to use them.
The red is positve (+) 12 volts. The black is negative (-) ground. The yellow is sensor (RPM) and the blue is control (PWM). Don't use the yellow and blue. If it's going to run it will be off the black and red.
You can solder the two open ends of the wires/base together. Generally, it doesn't hurt at all to have the yellow wire not connected. As long as the fan is still running, you will be fine. The yellow wire gives information about the fan RPM. You just won't be alerted if the fan stops working.
Dell used to be a real *****. The connector looks the same as a industry standard, the industry standard plug fits into the motherboard but they changed the freckin pinouts. The only reason they did this was to make your frustrated. If you want it done right you should build it yourself ;)
Take a look at your old fan are the wires colored? Red typically means voltage+ whereas black is ground. the third wire is information form the motherboard at what the fan should be running at. you are going to have to either take the wires out for the connector and switch them around or you can get one of these nifty things.
The fan should have a red and black wire. You don't need the other one or two wires if there is (yellow/blue are for monitoring, if they are there).
The fan will take anywhere from 5V to 13V, so depending on how much noise you want you can change it.
As for the amperage, you want at least 1A. Most fans take 0.3A, but some powerful ones can take up to 0.6A. The quick easy route: Go with 12V and 1A., so 12W.
As for running them in parallel, sure you can. I've done it myself many times. Just match red with red and black with black, so that the endings are still just one black wire and one red wire. You can chain as many as you want, but add 1A for each fan.