imac 21.5 hdd temperature sensor help!!!

Discussion in 'iMac' started by gugutm, Oct 31, 2017.

  1. gugutm macrumors newbie

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    uk
    #1
    Hi everyone
    i am new in this forum, sorry for my english mistakes as well because it is not a first language of mine,

    i got a problem i was trying to read in google in this forum as well, but i am a bit confused
    my imac mid 2010 wd hdd fail so i bought a new seagate 1tb at that time i didnt know that it will happen with this hdd temperature sensor, that fan will run in a full speed,
    i done a research, and i find out that there is a 3 types of hdd temperature sensors, wd, hitachi, and seagate, and they all different shape,

    so my question is cos now i dont have wd hdd and i replaced it with seagete, if i will buy a new hdd temperature sensor from ebay for seagate , is it will work , cos i was reading yes you can use hhd fan control software and i tried which worked perfect but ,i have to pay 28 pounds which i dont want to, or you can short but also i am not to sure if that will work, but people say yes, it does,

    so what i did i tried to connect straight to hdd those 2 wires black/and grey, cos i looked at google
    https://d3nevzfk7ii3be.cloudfront.net/igi/uo5O5NJPCoqZxEh1.medium

    and i done the same, but for some reason it is not working then fan after some time start running at full speed,

    so now i dont even know if it will work with a new seagate temperature sensor cable , cos i i connected exactly the same 1 pin black, 2 pin grey.

    any help will really appreciate

    gugutm
     
  2. Zeke D macrumors 65816

    Zeke D

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    #2
  3. gugutm thread starter macrumors newbie

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    #3
    i was thinking about it as well cos i was reading about them in yours and in some one else forums about them , i will think and update what i did and how it worked out
     
  4. gugutm thread starter macrumors newbie

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    #4
    hi there update time
    so i bought from ebay https://www.ebay.co.uk/itm/Apple-iM...e=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

    Temperature -sensor and it fits in seageta hdd perfect but compering my hack i done exactly the same with my old one, that is why i thought most likely i will have the same issue , and i dit after some time the fan went to maximum speed

    really disappointed,

    but i want to make it right so now i am thinking to buy this onother one with Transistor i think this is the best one,
    i download Macs fan control its free good working version , it does the job really but its software,

    really confused now and angry about this king of stuff

    or the last think i red about just bridge with a wire the sensor and it should work , but dont want to fu...k it up

    any advice i will really appreciate
     
  5. gugutm thread starter macrumors newbie

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  6. Zeke D macrumors 65816

    Zeke D

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    #6
    My understanding is that for the drive to work correctly, it must be an apple-branded rotational hard drive and have apple firmware installed. I'm aware of three different connectors for Hitachi, Western Digital, and Seagate.
    [​IMG]
    That's why the 2008/2009 ODD sensor is a better fix, because it operates independently of the drive used, and has the added benefit of working with SSDs or no drive at all.
     
  7. tn-xyz macrumors regular

    tn-xyz

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    Sep 13, 2017
    #7
    why don't you buy the thermal sensor connector from OWC?
    it usually solves the problem you described.
     
  8. dogslobber macrumors 68040

    dogslobber

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    #8
    Run Mac fan control and set the hd fan speed to 1100. Been running no a couple of iMacs that way for 3 years.
     
  9. Zeke D macrumors 65816

    Zeke D

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    #9
    That is absolutely the worst advice. Setting the fan speed to a fixed speed, one that is the lowest of the scale will not achieve any cooling as the unit heats up. The rotational drive will still produce heat, and that heat must be dissipated, or it will damage the LCD panel. If you're running SSDs, then heat is less of a worry, but the OP has stated that the replacement drive is a seagate. Even the single-platter green drives produce a magnitude of 3 or 4 over the hottest SSDs. The best move in regards to using macsfancontrol is to set HDD fan to sensor-based, and probably the best sensor to use is the seagate itself. Then, adjust the min/max temperatures so that the fan noise is appropriate, while still providing cooling.
     
  10. dogslobber macrumors 68040

    dogslobber

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    #10
    Ah, I read the 1TB Seagate as an SSD which is what I run. If it’s a spinner then don’t use this program. I’ve used the app with x2 21.5” with replacement SSDs.

    Edit: actually is it an SSD that the original poster is referring to? It’s not clear.
     
  11. yelkenli, Nov 4, 2017
    Last edited: Nov 4, 2017

    yelkenli macrumors newbie

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    #11
    What is the issue with fit with the hard drive? My understanding is the sensor cable plugs into the motherboard (or other board), and the sensor itself is taped onto the drive. In my case, this is an SSD.

    Will a 593-0998 billed as a 'Seagate cable' work in my mid-2010 21.5 iMac?
    The picture in Zeke D's #6 posting on using a cheaper solution points to a 593-0493. probably the same parts, different length of cable or other minor change? Any knowledge on this would be nice. I am not able to see the connector shape on ebay pictures, and the #6 post picture shows a small 2 pin connection on the mother boards.
    Or would this work:
    https://www.amazon.com/ITTECC-Repla...ywords=593-0493+iMac+temperature+sensor+cable
     
  12. Zeke D macrumors 65816

    Zeke D

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    #12
    The three connectors I showed in post #6 only work if the drive is apple branded and has the apple firmware on it. The 593-0493 is an optical drive thermal sensor from a 2007/2008 iMac. You tape the thermistor to your rotational drive or SSD, and plug the 2-prong connector into the logic board. I recommend positioning it on your replacement drive so it lines up with the center of the plastic air duct of the middle or HDD fan.
     
  13. robeddie Suspended

    robeddie

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    Atlanta
    #13
    You guys drive me nuts, skip the cable Just run Macs Fan Control

    https://www.crystalidea.com/macs-fan-control

    This program allows the fans to run faster as needed, but uses the hard drives built in S.M.A.R.T. sensors to gauge what is needed. I’ve used it for years on my upgraded iMacs and it works great and never had a problem with heat, or out of control fans.
     
  14. dogslobber macrumors 68040

    dogslobber

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    #14
    With a Spinner or SSD? I’d only use it for an SSD but then I also don’t know why somebody would put a spinner in there nowadays.
     
  15. robeddie Suspended

    robeddie

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    #15
    It works for either. All drives have S.M.A.R.T. sensors, which is was Macs Fan Control uses, so it doesn't matter.

    It's a program specifically written to safety use a non Apple drive in an iMac that typically requires the apple thermal sensor cable. It's regularly updated, so it works with High Sierra. With a simple, effective, free program like this, there's really no excuse to be screwing around with that sensor cable.
     
  16. yelkenli macrumors newbie

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    Jul 15, 2017
    #16
    Zeke D: thanks for the explanations.

    I see it now. The drive specific cables have a plug on each end (hard drive on one, motherboard on the other).
    An alternate arrangement is to put in a diode or transistor to replace the hard drive end - per this post which includes your '09 ODD recommendation:
    https://forums.macrumors.com/threads/2010-imac-hdd-sensor.2065341/
    or put in a jumper (very 'Russian' according to this German - too funny)
    https://www.hardwareluxx.de/communi...atte-im-neuen-27-imac-ssd-upgrade-668088.html

    But how do the HDD internal sensors work? are they communicating via the 2 pin cable to the mother board using TTL?
    If I putt in a transistor or diode does the motherboard receive a constant temperature signal, and runs the fans ... according to what? or just drive them low? or does the OS receive a signal via SATA communications, and the cable is just an on/off handshake, etc?

    For the 593-0493, cable, this has a sensor or a transistor?
    If sensor, what kind? a pt100, thermistor?

    robeddie: thanks for the recommendation. Hard to say which way to go as the prices are about the same. I might solder in my own transistor or pick up the ODD sensor.
     
  17. robeddie Suspended

    robeddie

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    #17
    You can download and use Macs Fan Control for free indefinitely. So the prices aren't the same.

    Plus it's guaranteed to work, unlike some jerry-rigged cable.

    On top of that, you avoid dinking around inside your computer more, and thus avoid some accidental slip-up that could fry something.
     
  18. Zeke D macrumors 65816

    Zeke D

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    #18
    For the 593-0493, I'm not sure what kind of sensor it is, but Apple has been using them since they started with intel CPUs in 2006. The different part numbers just correlate to different wire lengths, logic board connectors, etc.

    Here are the reasons I'd recommend the 593-0493 over all other solutions:
    1. This sensor will still control the fan speed when the unit hasn't booted to the OS. This includes installations, and target disk mode. (macsfancontrol requires the OS to be logged in to work.)
    2. Since it's an apple-branded product, you know it's compatible, and that there is little chance that it could damage your unit.
    3. There isn't a lot of extra material that has to be hidden or tucked away. it's precisely the length to be routed with minimal slack, as to not obstruct airflow.
    4. Mounting. If you are uneasy simply using a piece of electrical tape (or thermal metallic tape), you can purchase a plastic mount for the sensor: 922-8183 (They're about $1 - $3 online)
    5. Price. These sensors are so readily available, that they cost less than $5 per unit. (I purchased six of them so that I'd have extras, since the 2010 iMacs are being phased out by universities, etc.)
    6. It will fulfill the requirement for Apple's hardware test, resulting in an (exit; 0).
    7. Myself and two others have tested it out on multiple 2010 27" & 21.5" models. I've installed them into 8 units to date, and each of them perform as expected.


     

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17 October 31, 2017