Since there's no signal from the sensor, my guess is that it will default to full speed, for safety. Hope that helps. James Gordon. The "missing" componet is the thermal sensor, which is attached to the stock hard drive. When you take the stock hard drive out you will see that there are two connectors - the main hard drive connector and another, thinner connector. The wires for that thinner connector are stuck to the side of the hard drive with the plastic "cover". A cursory glance will make you think those wires are just part of the hard drive, some superfluous connector that it appears you don't need, since the SSD works fine with just the main connector attached.
They are not superfluous. And those wires don't actually go into the hard drive either. All you need to do is pull the plastic "cover" off and then gently peel off the sensor from the hard drive.
Monitor System Stats, CPU Temp, Fan Speed in Mac Notification Center
Then you can plug the sensor back in to the appropriate socket on the main board and run the sensor to somewhere where it might get hot. I just ran mine up near the RAM and now my fan works correctly. That's an amazing find! I was wondering what that extra lead on the old HD was all about. Prayed it off and will attach to the new SSD. Hoping that will do the trick. Thanks for this tip; we had a mini with 2 HDs but didn't need them both. Pulled sensor off second drive and attached to the first only HD needed and worked like a charm.
Monitor and control fans on Apple computers
I assumed since I didn't have an optical or second HD that I wouldn't need the sensor in place One thing to check is the print manager. Sometimes the CPU gets stuck on trying to print to an unconnected printer. I found that every time I want to my Mac mini 2. I killed the app and the fan slowed down with about a minute and within 2 mins all was quiet. Thanks for the tip Frank. I had this fan spin issue on my older core 2 duo mac mini, after installing an ssd. I solved this by replugging the fan in proper orientation. I must have turned it around during reinstallation.
The issue for me was a tiny little wire that went into one of the sensors had come out just a bit, enough to break the connection. After using needle nose to slip it back up into the clip the fan worked fine. It seems possible to swap the two accidentally. Good luck. I have resolved my fan issue. A surface mount component had somehow come off the logic board and as a result the pwm fan control signal was not controlling the fan.
fan speed on ghz mac mini () never changes | MacRumors Forums
The fan defaults to full speed when it sees no pwm signal. I was able to see the monitor signal was working by using smcfancontrol and the slowed the fan with my finger - the rpm changed. As a result the mac was requesting, for example, rpm, but as the fan didn't see the request it was giving approx.
The missing component was a bridging SMD device. By hooking up an oscilloscope I could see a pwm signal on one side of the missing bridge, but no signal at the fan.
1531 Macs Fan Control Reviews
As soon as the 2 pads were bridged normal service resumed. Not sure how this component has become detached, presumably when I removed the fan connector. Anyway, it is worth checking for 2 solder pads just above the fan connector - if you see no component then you may have the same issue! I'm having the exact same problem but I don't have an oscilloscope. Thank you! Thank you AAC for the tip about the little smd component just next to the fan connector, somehow it got unsoldered and there was no contact, there are 3 components, and the one close to the fan connector was the issue.
I checked with my multimeter and there was no connection, it seems to be a little diode or something because checking continuity after fix there was no resistance, one of the fan pins goes through it. Thank you again, also I had this SSD fan control application that did not work until I got this fixed.
My board had 3 connector for the sensor's, 1 was for the hd temperature, DVD temperature, and 1 for ambient temperature. If you don't see 1 it is probably broken take a good picture of where the fan connector is at surrounding area, and I could point you where is it supposed to be. How can i solve this? Just bridge the connection? Hi Step I checked, with my multitester and it seems it is not a diode, measured resistance on it and I got 0.
It can be a smd cap but not sure, I wish I could help more.
Hi, When I had this problem, I gave it to a friend of mine with a full electronics workshop in his garage. Using an oscilloscope, he was able to see the fan control signal on one of the solder pads of the missing component. He was then also able to see that the other solder pad was connected to the fan control pin of the fan connector. He then measured the impedance of the fan control circuit of the fan and the motherboard and was able to deduce based on similar low voltage fan controller designs that the missing component was either a low or no voltage jumper component.
As such he then just bridged the two pads with small piece of wire and my mac mini has been working flawlessly for 2 years now! As Lui has measured this to be 0. My friend doesn't believe that this component would have been a capacitor. Show 7 more comments. It would have been even more helpful if I didn't already find the answer on my Mac! It has an SSD in it, and even though the body was completely cool, the fan was running at maximum speed, which is quite distracting.
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It was a plain text file called "slowfan". All I had to do was drag and drop it into Terminal, after I read it -- don't run code you don't know what it will do. You need to create the "Apps" folder first, in your User Home folder.
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My problem when I pulled off a socket from my board when removing the plug attached to my optical drive thermal sensor while replacing the battery. The sensor program allowed me to choose among different sensors by listing their current operating temp and what component they were sensing. Sadly, the software solution is not a good long term fix. There are people with micro soldering skills that might be able to fix the damage. I would recommend you give them a try. The web site that led me to this software also offered that apple had a fan control app, that did the same thing , but it was developed for the iMac which employs more than 1 fan and therefore wasn't ideal for the mini.
The forum is on Macgurus. The software I suggested has been used since at least on both macs and pcs with no negative feedback I could find. If you know otherwise I am interested.