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Thread: Help, I cannot control my fans any more, yes another problem

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    Senior Member mikeo01's Avatar
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    Help, I cannot control my fans any more, yes another problem

    Hi, so I bought a Y splitter cable to support my fans and attach it to the headers on my board.

    I checked the ampage, both fans add up to 0.5A, each header is rated 1.0A max.

    My board is ASUS M5A97 PRO.

    I bought the cable so I can control my fans from the chassis headers on my board, working fine.

    I decided to play around with my fans and snagged it on my heatsink, I realised my fans weren't working and a nice smoky smell came out, fortunately I shut it down quickly to realise only a bit of plastic on one of my fans wires was melted off, patched it up, fans working fine now. My fault!

    Ever since that I cannot control ANY fan regardless, I disabled and enabled Q-Fan, reflashed the BIOS, cleared CMOS, took out all hardware, switched fans, used with and without the Y cable splitter with no luck.

    On the AI Suite I cannot "Test" my fans, its greyed out. I set my RPM values in the BIOS, no luck, fans are still running at 100% regardless of what I do.

    I tried one fan in the other chassis fan header, no luck. When I snagged my fan the metal wire was touching the heatsink causing a short, so nothing really happened.

    I can control my CPU fan from the CPU header which is located right next to the heatsink. The unaffected chassis header is located at the bottom of the motherboard, but I still cannot control fans off it.

    Bear in mind I can see my fans in the BIOS, their reported RPMs, everything, just not being able to control them. They are 3-pin fans, and my board undervolts it to achieve a lower RPM, so no PWM is not the issue


    Anyone have any idea of what went wrong? My whole board is fine, I can do everything normally, just not being able to control any fans on any CHASSIS header? Surely nothing is fried because the CPU_Header can control fans?


    Thanks for any ones input, I must be the most unlucky user on hexus with all the problems I have had
    Thanks for every ones help

  2. #2
    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    OK was looking on wiki, resistors and diodes are used to control fan voltages?

    If 2x chassis fan headers don't work but the CPU_header can control fans then does this mean there are two controllers for the headers?

    It looked like I caused a short, could this have damaged a diode/resistor?

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    Re: Help, I cannot control my fans any more, yes another problem

    Dont use any case fans myself as temps good.

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    root Member DanceswithUnix's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    Quote Originally Posted by mikeo01 View Post
    OK was looking on wiki, resistors and diodes are used to control fan voltages?

    If 2x chassis fan headers don't work but the CPU_header can control fans then does this mean there are two controllers for the headers?

    It looked like I caused a short, could this have damaged a diode/resistor?
    The resistor/diode tricks are a cheap way to drop fan speeds, but not used on motherboards.
    There is a chance you have fried the fan control circuit, so now it can only dump full voltage into the fan. Transistors don't always fail off, sometimes they fail to a short circuit so they stay on.

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    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    Ahhh, but on such an expensive motherboard I would of thought there would be some sort of protection.

    Hopefully I can RMA it, unfortunately have had nothing but problems with this ASUS board

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    DILLIGAF GoNz0's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    it is protected, you blew the protection and saved the rest of the board. just be glad part of the protection is running the fans flat out so you don't fry anything else due to your own silly mistake playing round inside a PC with it running!

    Capitalization is the difference between helping your Uncle Jack
    off a horse and helping your uncle jack off a horse.

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    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    I didn't play around with it when running, I am too scared I will get a nasty shock

    I disconnect the AC cable, switch the PSU up and down couple of times to get rid of static and then I did it.

    The problem happened upon startup, so I connected everything, then put the AC cable back in and THEN turned it on.

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    DILLIGAF GoNz0's Avatar
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    What's the part about catching the cooler then?

    Capitalization is the difference between helping your Uncle Jack
    off a horse and helping your uncle jack off a horse.

  9. #9
    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    I disconnected everything, because I wanted to see if it would be better to control my CPU and side fan via 3-pin fan header. It wasn't, so obviously when I shut down the computer and opened case to replug my top fans I snagged the cable slightly, plugged everything back in and because the two fans are on the same Y splitter cable they didn't turn on, so shut the PC down quickly because I knew there was metal touching somewhere. And thats when I smelt the plastic smell.

    On the cable there is a bit of plastic missing, the metal looks fine and not burnt, so patched it up, rebooted and everything was ok, fans running fine, no smell, like nothing had happened.

    So I could control the 3-pin fans via a 4-pin header before I snagged it, after I snagged it (the short) I couldn't.

    It was an accident, I always take care when handling PC parts and I never have the PC running. I always touch metal so to discharge myself much like a wrist band and dry my hands thoroughly. So I am not sure if the PC is completely confused by what happened or if I have burnt something out. Obviously I want to be sure before I do anything.

  10. #10
    DILLIGAF GoNz0's Avatar
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    Ah ok, sorry for saying its a silly mistake. Just bad luck. Either way you blew the fan controller so RMA is you only option

    Capitalization is the difference between helping your Uncle Jack
    off a horse and helping your uncle jack off a horse.

  11. #11
    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    Its OK I worded it silly.

    And yeah I will have to see if I can

  12. #12
    Senior Member mikeo01's Avatar
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    Re: Help, I cannot control my fans any more, yes another problem

    Contacted scan now, thanks everyone

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