![]() ![]() The tachometer output typically comes from a Hall-effect sensor mounted on the motor driver PCB on the fan frame. Motherboard may have to pull up or it may happen to 12V in fan (there is no rule it seems and there will be exceptions to what is considered "normal"). Intel 4-Wire Pulse Width Modulation (PWM) Controlled Fans document. Molex have a special 4 pin fan connector which is designed to accept both 3 pin (no PWM speed control) and 4 pin fans. ![]() Maybe there is a way to detect a PWM signal with an oscilloscope and be sure it is that.īut for the pin that are originally bridged (3 and 5), if I try that and it's different, I can create a short circuit and bye bye the computer.There is no agreed standard connector for PC fans, but there is a most choice. If +12V on pin one and pin 2 is grounded, the pin are identical in both machines. Very silent now with a stronger airflow and classic fan compatibility in bonus.īut my question isn't to bypass the detection, but what is the fan pinout of a Vectra VL/500 model 515? But as Overdrive can become hot, I choose to made an adapter from a male 3-pin fan to the plug used by the 486, replacing the original 40x40x20 fan by a Noctua. It is possible bypass the POST detection. Ditto to HP in general when I had to learn to ground unused or non-HP connectors using HP boards in generic PC, not just for fans. They ground one pin as long as fan is working but I don't have any dell fans and don't like their choice of dell fans. I had to do this to my proliant 1500 and many Dells using 3 pin fan which they do not use tach for this. I use 10 to 47 ohms resistors to ground these detection pins. When experimenting to bypass the detection. ![]()
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