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  1. #1
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    [Asus G751JY] CPU Fan suddenly running at full speed all the time.

    Hello,

    yesterday while i was doing some web browsing on my G751JY my cpu fan suddenly started to work on full speed and it works like that till now (I'm assuming that CPU fan is on the left if you look on the laptop opened screen and use keyboard). CPU is extremely cool (36 C) and the air going through the vents as well. I tried restarting my computer but it didn't help. The CPU usage during idle is about 1-2%, but the fan still works at full speed. The GPU (Graphics Card) fan is working in normal way. What can i do to make my CPU fan work in normal way as well?
    Last edited by Karzmu; 12-30-2014 at 10:42 AM.

  2. #2
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    Hmm... Sounds interesting because some people over here would prefer to know how to make the fan go on full speed to lower the temps ). I assume if may be a driver related problem. Did you try to install any of the bios versions from ASUS support zone? Or did you try to use any kind of software to control your fans ?

  3. #3
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    I did completly nothing with the BIOS or Fans control. Just suddenly CPU Fan started to work at full speed and it's annoying because it's really noisy now during idle . As I said GPU (Graphics Card) fan works completly normal only CPU Fan is spinning like hell :P

  4. #4
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    Could you tell us the RPM of the CPU fan at this moment ? Use HWMonitor and check it out.

  5. #5
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    It's 4100 - 4200 RPM constantly.
    Last edited by Karzmu; 12-30-2014 at 11:48 AM.

  6. #6
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    Dude. You have just answered something that we we're very interested about . Your problem may lead to our solution. Ok. Firstly I wanna ask you to make a print screen with the HWMonitor and the fans RPM and post it here because this will help us further into convincing ASUS that we need a more aggressive fan profile to lower the temps. The CPU fan in all cases never went over 3100RPM even at 91C.
    Regarding your problem, let's see how you could solve it. I would firstly suggest you to reinstall the chipset driver from here: http://www.asus.com/Notebooks_Ultrab...Desk_Download/ and after that download the Windows BIOS Flash Utility along with the latest Bios version 205 and then update your bios to 205 using that tool. Just use the Bios Flash tool and then restart the PC and let the bios update make its things. After the update is complete, enter the bios and check if the version is really 205. Then check it out if the fan still goes mad.
    If this doesn't solve your problem, come back and well try to find another solution.

  7. #7
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    I post a screenshot of HWMonitor. I'm not so happy as you with this RPM because it feels like it isn't good for my fan to run so fast (but maybe i'm just not used to my laptop being that noisy). I'll give it a try with updating BIOS to 205.
    Miniatura de Adjuntos Miniatura de Adjuntos Fan RPM.jpg  


  8. #8
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    I've just updated my BIOS to 205 and still no difference. This fan is killing me Do you think that fan running constantly at such high speed can damage itself?
    Last edited by Karzmu; 12-30-2014 at 12:49 PM.

  9. #9
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    Sorry to hear about your problem with the fan but its also an interesting test case for those of us interested in investigating the G751s cooling issues. A patch/BIOS update to fix the fan profile might even fix your problem too. You can read up on it here: http://rog.asus.com/forum/showthread...nd-Overheating

    Would you mind running a stress test so we can see your CPU temp with the fan running at 4100 RPM? We've been using a standard FurMark + Prime95 Small FFT stress test so our results are reproducible and comparable. I'm really curious to see what kind of temps you'd get with the fan running at that speed.

    To troubleshoot your issue, the first thing I would try is turning off your computer and disconnect the AC power for 10 minutes. I'd say to also remove the battery but...

    I wouldn't worry about the fan in the short-term. Running at top speed constantly is probably bad for its longevity but I don't think it should be an acute problem. You could return it to the retailer. It may even be miswired to the motherboard.

  10. #10
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    As ExpatGamer said. This isn't an issue than can't get solved. If it can't be solved by software, then you could always contact the guys with the Warranty service or even RMA your laptop for another one (though I would strongly suggest to keep it if it doesn't have any other issues). May I ask you if your fan was running normal before ? Or this was an out of the box problem ?

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