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Post originale di: Chris Jones ,

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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.

[image|1730017]

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

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