I have used the sensors from earlier iMacs as well as from Macbook Pros. The Macbook Pro aluminum models are the ones I usually use. There are several of them, I usually use the ones that are under each fan. They have 2 leads just like the iMac which I extend to reach the drive. Then i attach the sensor with double-sided tape (same stuff we use to adhere glass on iPads and unibody MacBooks).
The sensors from earlier iMacs (if they are the 2 lead type) also work. Some splicing is usually required.
I have done it this way since the very first drive replacement I had to do on one of these iMacs. I don't think that any resistor or jumper is a good idea at all. Temperatures in a computer need to be monitored and the fans adjusted continuously for everything to work at peak efficiency. I don't want to leave fan control up to my clients to monitor. Nor do I want their iMacs running noisily because their fans have to be run at high speed all the time.
I'm perfectly willing to hack and modify things when it makes sense, (my Hackintosh is over- clocked to 4.7GHz, and I install Mt Lion and Mavericks on unsupported Macs all the time) but in this case it doesn't make sense.
Macbook Pro A1150 right fan ambient temperature sensor. Splice one of these (black to black and color to color) to your old sensor cable and stick it to the hard drive. The hard drive fan will function just as it did with the original drive.
People have over-thought this problem.
My thinking was:
I can't use the internal sensor so I need an external one.
I have all these other mac parts.
Maybe the sensor from another Mac will work.
Lets try a Macbook Pro sensor.
Splice the wires and try it out.
Works fine, all temps check out.
I did what instructions said and plugged the two pin lead into pins nearest the SATA port and PCB board and no issue with fans running full when done. It did require I push the two pins on new HDD underneath down to fit, used plastic septula and was careful. Works perfect.(WD Green 2TB Desktop Hard Drive: 3.5-inch, WD20EZRX)
由 Tim Coyle 完成的
@Tim - Did you fashion your own external sensor? We use this one: OWC In-line Digital Thermal Sensor for iMac 2009-2010 Hard Drive Upgrade its a simple drop in.
由 Dan 完成的
No Dan, Plugged the apple cable directly into WD HDD with 8 pins; into 2 pins closest to Sata port and board on HDD, it did not fit naturally so I pushed 2 pins(on HDD) below out of way for the cable interface to fit, but worked flawlessly and no full time fans.
However if I have an issue in the future I will certainly use one of those cables.
Visual reference of pin out and pins plugged into # shows pins that plugged into.
. . . . . . ##
. . . . . . . .
Shoot it did not maintain formatting for visual...Oh well.
由 Tim Coyle 完成的