The PWM input to the fan should also be high-z with no pull-up, so should cause no damage. It should be +12V on yellow relative to GND on black.īeyond that, the PWM/Tacho pin should be pretty low risk of damage if they are not right - the output of the fan is open drain with no pull-up, so can only pull to ground. You could test this by measuring the voltage between the yellow and black wires.

While it is just a guess, it appears they've used the standard pinout. I guess they didn't want anyone to be able to connect 3-pin fans to it, as to why, who knows. This is as opposed to the standard fan connector which is a modified version with alignment pin designed to allow both 3-pin and 4-pin fans. Maybe I shoudl buy a second spare just in case though.Looks like they've just used a regular Molex 4-pin KK connector. Moving the bottom pin in that image to the top slot and moving the +12V pin right next to it seems to be the correct answer. I used a multi-meter to continuity test the 5 fan pins and using another online guide I determined that there was continuity between the fan side pin 2 and the pin on the other end of the connector.

Apparently the way I had it was connecting power and ground to the signal RPM & PWM pins, which is why the PWM chip exploded. Plugged it in the other way, and although I have fried the control portion, nothing is melting or popping any more. This is such a minor part of my project that I am already regretting choosing your products since apparently you have decided not to document them any more. I am following online pinout guides like this one.Please let me know before the second controller arrives. You could save everyone a lot of trouble here by using cables with the standard IEEE color scheme, although I am sure these all black ones are cheaper. On the 4 pin connector as it sits in the controller looking top (side with the buttons) down I have the following left to right: I have this thing wired up to a molex and have tucked the unused signal wires into the shield that came with the cable. Already fried a controller and it takes almost a full week to get another one. I also need the pinout for the 4 pin header on the north (opposite the 5-pin fan connectors) side.

4 pin fan pinout download free