control my fan speed ?

kwah · #1 (**permalink**) 05-05-2008, 01:24 AM

hey... ive been doing my research about this today (im a software person, not so much about hardware so please forgive my ignorance) but i havent found information specific enough to my own setup that id feel confident following it etc..

after watching my cpu/hdd temp for a while using notebook hardware control and speedfan, my hdd steadily rose to 60C (with warnings at 55C) at which point my desktop fan came to use ..

in all fairness, it is my fault for having my laptop on my lap (the irony..) for blocking airflow and causing it to overheat but my past experience with cooling trays have been uncomfortable and clumsy so im wanting a more 'permanent' fix

my BIOS does not have any mention of any form of fan control / speed and speedfan does not pickup my fans so im at a loss as to what im to do but i figure that its likely that ill need to upgrade / replace my fan from 5V to a 12V fan, regardless?

oh, and the current fan is 3-pin (yellow, black, red)

Quote:

AB7505HX-HB3
DC = 5V 0.25A (X18)
HYPRO BEARING

stamped on it is "714A"

Digerati · #2 (**permalink**) 06-05-2008, 06:14 PM

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5V to a 12V fan

That will serve nothing. If your current fan runs on 5V, so must any new one, unless you are prepared to modify the wiring to bring in another 12V line. What you may need is a 5V fan that delivers more CFM (cubic feet/minute) of air. That is achieved by buying one that is designed to turn at a faster RPM and/or has engineered (aerodynamically) blades that by design, deliver more air per rotation.

You are right - being unable to use a laptop in your lap is a bit ironic, perhaps that's why most makers call them notebooks now days.

You should stick with the cooling pad, or have some flat, hard surface between you and the "notebook" so your clothing is not blocking air being drawn in underneath. Alternatively, have a desk fan blast down on it while it is in your lap may work too.

kwah · #3 (**permalink**) 13-05-2008, 09:49 PM

Quote:

Originally Posted by Digerati

That will serve nothing. If your current fan runs on 5V, so must any new one, unless you are prepared to modify the wiring to bring in another 12V line.

depending on the current involved, would a capacitor in series with the fan work do you think? i mean, quick intermittent bursts of 12v might be enough to keep the fan going at a faster speed than it would if it was recieving a constant 5v supply? what kinds of current are going through the fan?

meh, maybe im thinking too 'outside the box' and it would be easier to just rewire it / get a more efficient fan than fiddle with capacitors etc..

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You are right - being unable to use a laptop in your lap is a bit ironic, perhaps that's why most makers call them notebooks now days.

darn these marketing ploys :/

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You should stick with the cooling pad, or have some flat, hard surface between you and the "notebook" so your clothing is not blocking air being drawn in underneath. Alternatively, have a desk fan blast down on it while it is in your lap may work too.

the only problem with cooling pads is that theyre designed to be used on a flat surface and the cooling fan(s) that ive tried is that unless i sit in certain positions, those fans get blocked my my clothing also, defeating the purpose somewhat ..

cooling pads and flat hard surfaces are generally uncomfortable...

and desk fans work quite effectively, except that as well as cooling the laptop down, they cool me down as well =[

Digerati · #4 (**permalink**) 14-05-2008, 03:15 AM

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depending on the current involved, would a capacitor in series with the fan work do you think?

Huh? Umm, I think some classes in basic electronics are in order first. A capacitor in series will effectly shut down the circuit.

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what kinds of current are going through the fan?

I don't know. Depends on the design specifications of the motor. Every model is different.

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i mean, quick intermittent bursts of 12v might be enough to keep the fan going at a faster speed than it would if it was recieving a constant 5v supply?

You want to hit a device with voltages 240% higher than designed specs???

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cooling pads and flat hard surfaces are generally uncomfortable...

Oh well. Maybe try an external keyboard then.

kwah · #5 (**permalink**) 14-05-2008, 07:59 AM

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Originally Posted by Digerati

You want to hit a device with voltages 240% higher than designed specs???

noo.. i meant as a workaround to keeping a 5v power supply but with a 12v fan..

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Oh well. Maybe try an external keyboard then.

external keyboard would mean the screen is pushed back (unless they're somehow side-by-side) and I'd need an external mouse unless I reach over for the built-in one ..

Digerati · #6 (**permalink**) 14-05-2008, 01:57 PM

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noo.. i meant as a workaround to keeping a 5v power supply but with a 12v fan.

You can certainly install a 12V fan if you can find one that "physically" fits, but it will run at less than 1/2 speed - not what you want. 5V, 12V, 24V, 48V, 110VAC fans come in many varieties. The primary rating that you would be concerned with is the CFM (cubic feet/minute) or how much air it moves. This is determined by the Laws of Physics (specifically, aerodynamics) as governed by the rotation speed, pitch, shape and number of the blades. Notice I did NOT say the speed is determined by the voltage!!! The speed can be toggled DOWN, by reducing the operating voltage. Increasing the voltage above what the motor is designed for WILL cause the motor to overheat, and eventually fail - possibly with catestrophic results.

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external keyboard would mean the screen is pushed back (unless they're somehow side-by-side) and I'd need an external mouse unless I reach over for the built-in one ..

Well, the problem appears to be the user and not the notebook. Either use the laptop on a solid surface/cooling pad so it can get proper air flow, get a desktop computer, or use an external keyboard. Note that many people buy an external keyboard, mouse (or keyboard with touchpad), AND an external monitor for their notebooks to use when they are at home. I suggest you look into that and NOT into modifying a very sophisticated electronics device - especially since it would appear you know little to nothing about Ohm's Law. That is not meant as a criticism, as most folks don't, nor do they need to. It is just the way it is.

johnpol78 · #7 (**permalink**) 10-03-2009, 01:01 PM

There is option in each and every BIOS available is as called Temperature or Heat Control I think but try to make sure and then enter in this area and try Disable Temperature Warning, if you are unable to do any thing like this then leave this and enter into the BIOS and then try to set it on to the Default Level it will automatically set as default. and then press F10 to save and exit, then system or Laptop will start automatically started up and try to make sure that the same problem persist again - again or temperatures decrease.

i f you have desktop Then try to use blower to clean all fans and remove Processor from it's clip and use thermal paste and then back to reinsert processor into the slot. and then try to reboot your computer. i hope it will resolve your problem and you will be very very satisfied and happy and tension free user. try the best, Best of Luck.

Digerati · #8 (**permalink**) 10-03-2009, 01:58 PM

@johnpol78 - just to be sure, do understand the last reply in this thread is nearly a year old.

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There is option in each and every BIOS available

Sorry, but that is not true for all BIOS menus. Most do, but not all. AND not all use F10 to save and exit either.

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i f you have desktop

As stated throughout this thread, this is a notebook.

I do not recommend pulling the CPU on a notebook - that is best left to an experienced technician. And on a PC, unless the CPU was installed without TIM, or the CPU has been removed (do not reuse TIM) you do not need to apply a new layer.

I also do not recommend disabling over-temperature warnings. They are there for a purpose. However, there are usually user defined thresholds that can be changed to a more realistic threshold to keep the alarm from sounding prematurely - just make sure the setting is too high.