2011 Mac Mini Fan running 100% 0RPM reported (missing resistors?)

Discussion in 'Mac mini' started by Axelsnoski, Feb 26, 2016.

  1. Axelsnoski macrumors newbie

    Feb 26, 2016
    So I purchased a 2011 Mac Mini that was listed as having the fan running 100% speed, I thought it would be a thermal sensor and I could just replace that and be done, I went to try and slow the fan down using a few different apps SMC fan speed Etc to no avail, I did notice that the fan speed was showing as 0RPM Which I though was kinda Weird.. All the thermal sensors were giving perfect readings.... I ran a diagnostics on the sensors and got a pass for that as well.. Seems that isn't the issue.

    I moved onto looking at the fan and noticed the connector wasn't 100% complete which leads me to belive they had trouble removing it as so many have before, both the connector and the plug look a little damaged but the fan still Runs, At this point I assumed that the fan was damaged and not giving feedback to the computer as to its RPM... I purchased a replacement fan..

    The new fan arrived today and I installed it, while its a little quieter its still obviously running at full speed, so its not the fan, Doing a little more digging around I came across a link to this (https://www.ifixit.com/Answers/View/154380/CPU+Fan+runs+at+full+speed.#comment146815) Yeah its for Imac I assumed the same should apply... I opened up the mini and sure enough there are three missing resistors or at least It looks to me like they are (its pretty small space)

    Comparing this image

    to my board


    It seems fairly clear that someone must have nicked them with a screwdriver or something...

    My question is what are the codes for those and are they part of the fan control circuit

    If I can get that info I can get someone to solder new ones on for me.

    Thanks for reading and for any info you can supply :)
  2. Axelsnoski thread starter macrumors newbie

    Feb 26, 2016
  3. duervo, Feb 27, 2016
    Last edited: Feb 27, 2016

    duervo macrumors 68020


    Feb 5, 2011
    Those "dots" are just test points for equipment used to diagnose the individual components on the board.

    Oh wait. The red arrow was pointing right at a test point. I see what you actually are referring to when compared to the photo of your board. In the future, a circle or square around the affected area would be more helpful.

    It's been damaged definitely. Why didn't the seller disclose that to you? Would you have bought the system if you had known it was physically damaged like it is?

    You will have to send it in somewhere for component level repair. It will probably cost a few hundred dollars to fix (that seems to be the common range for a flat rate component level repair job.)

    If you have to ask what those pieces are, then you probably do not have access to the tools and schematics needed to fix it yourself. Unless you want to do the job yourself as a learning experience, as opposed to get a fully-working system out of it, I wouldn't try it.
  4. Axelsnoski thread starter macrumors newbie

    Feb 26, 2016
    He only said that the fan was running full speed.

    Really I just want to know what resistors those are since I cannot see any codes on it, I'm not worried about who is going to do the repair or the cost right now.
  5. Celerondon macrumors 6502a


    Oct 17, 2013
    Southern Cal
    Caveat Emptor :rolleyes:

    When a buyer decides to purchase equipment that is advertised to not be in working order they should be prepared to accept a certain amount of risk. Common causes of the full speed fan problem are traumatic damage to the connectors, fan or logic board. A quick search would reveal this information and plenty more even if the OP did not know about fan speed problems on Mac mini computers.

    This is what happens when heavy handed novices start poking around inside of these compact computer designs. The seller may not even know exactly how they damaged their computer! It might not be reasonable to expect full disclosure from a person who only knows that "I broke it somehow!" ;)
  6. Axelsnoski thread starter macrumors newbie

    Feb 26, 2016
    Seriously, I did accept the risk! I did know the common causes, more often than not its a sensor gone bad or disconnected...

    Really all I want to know is the SMD code for the missing parts, people want to talk about all kinds of **** other than what I have asked, I don't care about anything else EXCEPT the SMD codes or what they are...

    I have a plan already I just want help identifying the parts...
  7. duervo macrumors 68020


    Feb 5, 2011
    Well, that escalated quickly after only two replies.

    I recommend stepping back, putting on some relaxing music, and calming down. There's only been two different people that replied so far, me included.

    Lower your expectations as well, because Apple does not release schematics. There is an extremely low probability that you will get the answer that you seek. You will have to hope that an employee of questionable morals has leaked your schematics online, but I'm sure that you've already googled for them and found that none exist, at this time, for the part that you have.
  8. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    Have you looked at ifixit?

    You need hi-res pix of the area, or buy a dead LB
  9. Axelsnoski, Feb 28, 2016
    Last edited: Feb 28, 2016

    Axelsnoski thread starter macrumors newbie

    Feb 26, 2016
    I'm chilled :) I posted on a sperate forum and got a similar reply... Just get frustrated when people skip over my question and make unrelated assumptions..
    As MacVidCards says High Res would be great (I was hoping for someone with the same/similar model that could have a look if they had markings that were legible) I have done quite a bit of searching, No image I have come across as of yet is high res enough to see any markings unfortunately.


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