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CPU Fan doesnt work on Asus A7V133

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by luds 1 view

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...this is driving me bonkers...
HW:

MoBo: Asus A7V133
CPU: Athlon 1G
Mem: 256 MB 133
300W Powersupply in server case

I havent connected anything yet to the mobo.
Slapped on the Fan, connected it to "CPU FAN" connector on the mobo.

Switched sys on just to see if it works...
mobo does one beep (according to the manual meaning "no errors found during boot"), BUT
the Mobo Fan doesnt start. Neither does the
Chipset fan, that comes with the mobo.

The CPU gets hot, the AGP slot gets power (had a gfx card with fan on in it)

I havent checked it with a monitor , as I dont want to run the system without CPU or Chipset cooling.

First I thought perhaps a dip or jumper has to be set, but the switches/jumpers are in default, meaning jumper less mode.

Tried another Athlon 1G... same effect.
Tried an Asus A7V mobo... same effect.
The fans are standard 12V for Athlon (Titan)

I've been working the whole day on some other stuff , so am probably missing something obvious... hope someone can help me.

thanks a mill
luds

9 replies

by mike (from canada)

you are missing something obvious. here is what you do. take apart the component that contains the screwed up fan. use a soldering iron to detach the fan and remember where you detached the wires from. dont do any swapping. now get an adapter or theequivalent number of working batteries that make up the number of volts specified on the fan. connect the bumpy metal part of the battery (or the positive terminal of the adapter) to the red and the negative terminal goes to the other metal part. Ifthe fan doesnt go, replace it. Now connect the working fan the way the non working fan was connected before. If you switch the wires, then this fan will screw up as well.

by luds

Seems like it was "just" the MoBo being faulty.

Thanks to all for you suggestions. Good to have a place to ask questions and get some good feedback.

by grump

Take your VOM and check the power supply for 12VDC output.. If you don't have 12VDC out you ain't going spin any fan even it you try 2 dozen new fans..

Keep a smile on you face and nobody can guess what you are thinking..

by gmscne

If both fans refuse to turn, it may be the 12v supply or the wire connecting the 12v.
There are other fan connectors to try, one next to the power connector and one next to the battery. You may have to use a meter or some other device which will tell you if 12 volts are present on any of the fan connectors if the fan doesn't start from any of them. The 12 volt positive is on the center pin and the one on the left is the ground (if the notch is facing you). Small bulbs from an automobile run on12v and are not dependant on polarity, so you won't hurt them if you use one as a voltage indicator.
Before you take any of your fans apart, it's best to check them for operation with a known good voltage supply.

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