no fan power on motherboard, what could be the problem?

[bennyt]

Hi,

I got this ASUS A7A266 for nothing which will not even boot in barest configuration (128MB PC2100, TNT2 ultra GFX, Duron 1GHz, Power Supply).
The only evident damage/problem is that there is no CPU fan/chasis fan power. The on board stand-by LED comes on and the CPU gets hot.
So, are there any bright sparks that know anything about motherboard architecture and can point me in the right direction.

Does the lack of fan power suggest a particular problem or should I just quit while I'm behind because it could be anything?

Many thnks,
Ben

 

[jer22]

if neither of your fans come on i think i'd ace that board b-4 ya fry your cpu, or other components. just my opinion. jer

 

[bennyt]

I've taken care of the cooling via other fans for trouble shooting purposes.
Anyone know what MB components deal with controlling the power?

 

[ttn1]

My guess would be that someone tried to run a few 7200rpm fans using the motherboard headers. That's the easiest way to blow out the power on alot of motherboards. The fans try to draw too much current and certain components tend to "let out their smoke".

You'll probably have to trace through the power circuits of the motherboard. It would take awhile and you might never figure it out. At the very least you will need a decent volt meter and lots of time.

 

[microAmp]

<< My guess would be that someone tried to run a few 7200rpm fans using the motherboard headers. That's the easiest way to blow out the power on alot of motherboards. The fans try to draw too much current and certain components tend to "let out their smoke".

You'll probably have to trace through the power circuits of the motherboard. It would take awhile and you might never figure it out. At the very least you will need a decent volt meter and lots of time. >>



Would be even harder to follow the traces when there are several layers in the mobo. for the traces to go through.