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Cpu Fan Header Intermittent Failure


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#1 KDawg360

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Posted 22 July 2008 - 04:42 PM

This is one I have never encountered before...I bet you never heard that one!!...I am working on an Acer Veriton workstation that has me climbing walls. Acer has a known problem on the mother board, with the CPU fan header, fan header1, going bad...their advice is to swap to fan header2...this particular machine I have to swap back-and-forth between header1 and header2 on a continuum...this is way weird....when one header quits, it quits, but the other works....I know this makes no sense....but we're talking 'puters here....anyone have a clue as to what is going on? This issue may make me as schizoid at a PC!!!

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#2 hamluis

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Posted 22 July 2008 - 04:44 PM

Tried connecting it directly to PS?

Louis

#3 garmanma

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Posted 22 July 2008 - 06:36 PM

As long as the fan's not being monitored I'd do what Louis said. I never did use all the fan headers on a motherboard. I just don't trust the solder traces to carry all that load
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#4 KDawg360

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Posted 22 July 2008 - 06:56 PM

Thank you both, so far, for your replies. No, I didn't perform a bypass to the powersupply because I have had to defer to the header2 on six of the ten workstations on this particular job site. Acer FAQ page is how I determed changing headers as opposed to fan chaneout on the first of the machines to act up. And I have had no recurrance on any of the other machines. This particular one though, is strange. When I went back to fix this one the second time I took a new fan with me, but just to amuse myself I decided to revert back to header1 before replacing the fan. And guess what? It worked!! Since then, it did the same thing again and I had a surrogate swap it back once again...and guess what? It worked again!! I kid you not; when you swap the header it works...shut'er down swap back, and the header is dead. This is a true intermit that the header dies, and then comes back to life when the other dies; back and forth. There has to be an answer...my best guess would be BIOS confusion because when a solder trace is interrupted it stays interrupted, right?

Edited by KDawg360, 22 July 2008 - 06:57 PM.


#5 garmanma

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Posted 22 July 2008 - 07:04 PM

when a solder trace is interrupted it stays interrupted, right?


Not necessarily. I've seen plenty of strange things occur. Yours is an oddball, though
On the BIOS, all I can say is to poke around. I know on my new Abit board you have to set it to a 3 or 4 pin header. Who knows
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#6 hamluis

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Posted 22 July 2008 - 07:04 PM

Motherboard defect...is what I would call it.

Especially so if the problem can be bypassed by just connecting directly to the PS.

Louis




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