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Topic: Computer fan - 5V and GND switched? (Read 327 times) previous topic - next topic

Smajdalf

Hi, I am slowly scavenging HP notebook with dead CPU. Yesterday I got to the cooling fan. There are 3 wires in this order: red, black, yellow. On a PCB inside the motor it is labeled as expected: + at red wire, - at black one and S at yellow wire. But whole internet says all 3 pin fans should have pins in order GND, 5V, signal. Have anyone encountered such violation of computer fan pinout conventions? Maybe HP switches power pins to force customers to buy proprietary fans?
How to insert images: https://forum.arduino.cc/index.php?topic=519037.0

septillion

That is, if they use the default fan plug. This laptop fan probably doesn't ;) (Because those plugs are HUGE for a laptop).
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Smajdalf

#2
Jun 30, 2017, 01:03 pm Last Edit: Jun 30, 2017, 06:18 pm by Smajdalf
OK, thank you. I will connect it and look if it will rotate or burn ;-)

EDIT: as expected, red is + and black is GND, switched from "standart pinout". Thanks for confirmation.
How to insert images: https://forum.arduino.cc/index.php?topic=519037.0

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