Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor

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I messed up a cable changing hard drive

The connector cable for the "thermal sensor connector" broke as I was disconnecting it. How can I replace this part?

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There isn't a thermal sensor built per se. The Thermal sensor is built into the Hard Drive itself and is wired through the Power Cable. I'm assuming you are getting high fans soon after booting? If so there is something you can do to fix it. You will have to purchase a specific cable and run it inline with the hard drive power cable. OWC makes a pretty good one that I've used in the past. Just connect the power cable to the male section, the female into the Hard Drive, and the thermal sensor onto the HDD (preferably on the front over the platter)

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Actually a few comments back:

(1) I purchased the OWC cable and it controls the fan for my new 2TB internal HD - this is not my issue;

(2) I needed to install SSD Fan Control to get the optical drive fan to stop spinning hard - I assume this relates to the SSD I put in attached to the second Sata port and located beneath the optical drive.;

(3) my original question was about the "thermal Sensor connector" (as it is called on iFixit). This is the left most cable that is attached to the logic board and goes to what I believe is a heat sensor mounted at the top of the chassis. The part has a label 593-1258 and seems to be also know as Skin Temp Sensor (593-1258). I seem to have the wires connected without the connector (it broke) and taped in. Should I replace it? How important is this connector?

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AH! Yes I know what you speak of, it is also known as the Skin Temp Sensor. PB medic has some good cables too. Here's a link to the cable you're going to need to replace

http://www.powerbookmedic.com/Intel-iMac...

The old one is actually adhered onto the top case, and with a thin, flat too (like an isesamo) it should come off with relative ease. I would recommend using some strong double-sided tape to hold the new one in place. You don't have to replace it, but you will get high fans if it's not functioning correctly. But if you're okay with your iMac sounding like a jet engine then you shouldn't worry about it too much

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