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CPU Fan Doesn't Spin

Does the CPU fan on the VGC-LS1 always spin, or does it cycle on and off as needed?

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  • robk444 Apr 13, 2009

    Joe, thanks for the prompt response, and extensive solution.. Let me give you some more background.

    I got the unit from a friend for free as he said it would not power on, and he did not want to deal with it. My profession is a Network Admin, so I figured I would be able to fix the issue, and in return I was getting a nice system for my time and "low" costs.

    I found out that the motherboard was bad and needed to be replaced. I found a honest, and reliable website (blueraven.com) that said they would send me a replacement mobo for $100, and I needed to send mine to them as a core return. This was great as a new mobo for this system is at least $800..

    So I got the replacement board, and installed it. Immediately I noticed that the CPU fan was not spinning. I tested the voltage on the board where the fan goes and it's pushing the correct voltage (5V)..

    So, I ordered a new fan... would you believe that the new fan does not work either.. I decieded to plug in the CPU fan (5V) where the case fan (12V) plugs into, and ironically, both CPU fans work, old and new.

    I am now stumped as to why neither CPU fan works where they should work, even though the board is pushing the correct voltage (5V)... This is why I thought maybe they cycle on and off as needed. I agree with you in that all CPU fans that I have come across all run constantly, however, I am stumped with this one.


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  • Computers & ... Master
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First time that I had heard of a Sony Vaio VGC-LS1, so I had to go take a look. Pretty Cool!

I can only tell what I think from a tech standpoint of view on it's processor fan.

1.This computer is housed in a housing that incorporates the LCD screen also. It's set up just like a laptop, except the LCD screen is in the body. (Housing)

This means you not only have the heat of the processor when it's running, you also have the heat of the LCD screen.
Plus it's all packed into one tight 'box'.

Processors give off a lot of heat by themselves. If they aren't kept to a certain thermal limit, they will burn up. Literally! Like ON FIRE!

When a processor goes beyond that thermal limit, there is a built-in Fail Safe feature that turns the processor off.

In ANY computer I've seen, or worked on, the processor fan is constantly spinning. As the load for the processor increases, so does the heat given out by the processor, and the fan spins faster.

It is my contention that you have a bad processor fan. I would at least ask a tech in your area, and see if this is so.
If your computer is turning off on you while you are using it,
you have a bad processor fan.

Posted on Apr 13, 2009

  • joecoolvette
    joecoolvette Apr 13, 2009

    Forgot to add, this is where I saw the Sony Vaio VGC-LS1,
    http://reviews.cnet.com/desktops/sony-va...


  • joecoolvette
    joecoolvette Apr 13, 2009

    I have read what you stated, and am not doubting your statement for a minute, about the fan header on the mobo put's out 5 volts DC. Nor am I doubting your computer prowess.

    All I know is that the older fan's used 5 volts, and the newer fan's use 12 volts. I also believe, that with the fan plugged into the 12 volt connection straight from the power supply, that IF, it has a sensor wire, the fan RPM's will not change. Change as the processor becomes hotter or cooler. The fan will just spin at one constant rate of speed.

    Not a bad thing. Just easier on the ears if the fan spins down to a lower RPM.


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