HDD Temperature sensor gone in 2011 iMac?

HDD Temperature sensor gone in 2011 iMac? It looks like the temperature sensor in the iMac for the hard drive if now gone in the teardown - can iFixit confirm?
Asked by: Guest \| Views: 672

Total answers/comments: 5

Comments display order:

bert [Entry]

"Timothy Poon

Rep: 107

2

1"

bert [Entry]

"Y splitter cable works if you are upgrading to SSD. I don’t know why Dan keeps recommending OWC cable. maybe kickbacks from OWC. it’s overpriced and meant to take advantage of naive user.

more info about this sc*m can be found here

https://www.youtube.com/watch?v=pMsk1o1W..."

bert [Entry]

"Thanks Hanno for this hint!

It should be noted here that on the SATA side of the cable the wires 1 and 4 have to be shorted (and NOT wire 2 and 7). This is much easier then Apple's official solution where you have to take the iMac almost completely apart.

For better understanding I have added below some (low resolution) photos. (Sorry for the bad quality).

CAUTION!!! This modification is ONLY VALID when you switch to a solid-state drive (SSD).

DO NOT use this mod to connect a normal harddisk drive! This will most likely result in massive overheat of your iMac."

bert [Entry]

The correct way of dealing with this is to use this: OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade. This has proven to be the best way to handle the sensor issue which ever drive you put in.

bert [Entry]

"I’ve been reading this thread and the Y Spitter solution. I am 100% sure this is just grounding the temperature sense data pin 11 on the sata power plug to the hard drive. These sata power splitters and the connections on a standard ATX power supply tend to be be wired with 5 x 3 sets of pins bridged together. 3.3v , gnd, 5v, gnd, 12v.

The 3 pins 10, 11, 12 in one of these splitters are all grounded. Maybe grounding this temp sense pin 11 shuts the fan up. I wonder what apple do in the late 2012+ models when it is a blade only SSD only model with no standard drive.

My other reading implies that in the pre 2012 models there was a blanking jumper plug that was sometimes put in the unsued sata power port to keep the SMC happy with no drive present.

Standard sata power wiring.

Sorry if this has been answered I just thought my thoughts may be useful to anyone stumbling across this tread like i did."