Re: [vox-tech] Demo Machine: Stopped Rear Case Fan.

[msimons]

On Sat, Jun 08, 2002 at 01:14:49AM -0700, Bill Broadley wrote:
> On Fri, Jun 07, 2002 at 05:50:33PM -0400, [EMAIL PROTECTED] wrote:
> >   A while back I commented that the read case fan had failed.
> > One of the things I did yesterday was to swap the front and rear case
> > fans to see if the fan was operational or not.  It turns out that the
> > fan is 100% operational...
> 
> I assume the old front fan that is the new rear fan didn't spin up.

  Yes.

  Before swap: front fan spinning, rear fan stopped.
  Swap front fan with rear fan.
  After swap: front fan spinning, rear fan stopped.
  [Since this didn't fix anything I swapped fans back to their 
   original locations]

> >   I think the motherboard isn't suppling power to the back case fan
> 
> It's likely dead, abit bp6's are famous for this, no idea what
> kind of motherboard this is.

  Tyan Tiger 100.

> >   Another defect appears that the SMBus chips can not read the 
> > CPU1 Fan speed...
> 
> Is the cpu1 fan connector connected to a fan with 3 wires?  2 wire
> fans will spin but not show rpm.

  Yes, three wires.

> > - Someone with electrical skills want to test out the three pin 
> >   fan connector to figure out what is going wrong?
> 
> I'm betting on a short.

  Would this short release the magic smoke, or if the short is 
corrected would the thing be operational.  (I've not taken the
motherboard off the backplane to see if something is caught underneath,
this connector is extremely close to one of the motherboard mounting 
pins).

> > - Any suggestions on how to get the fan spinning? (1)
> 
> Get an adapter from the standard 4 pin power supply to whatever
> the fan takes.

  I took a different tact... I routed the CPU1 fan to the CPU2 
connector, then the case fan to the CPU1 connector.  Now all four
fans in the machine (power supply, two case, and one processor)
are all operational.
  I was going to connect case fan to CPU2 but would not reach.

  The interesting thing is the lm79's fan RPM information still
only reports one set of RPM information... now "fan3" is reporting
when "fan2" used to report.  I haven't figured out if the fan3 numbers
are for the front fan or not.

> > - Has anyone else seen motherboards fail to spin fans like this?
> 
> Common on abit's, most often when using a higher performance (more
> power hungry) fan, or when plugging/unplugging fans while
> the machine is on.

  These are large case fans (about 5 inches square).  I doubt that
anyone messed with the fans while the machine was operating since 
it was given to us... based on Henry's comment that the back case
fan has never functioned.

  I was thinking that this defect might have been why this machine
was donated... it would have failed a QA check and customer 
inspection would have most likely resulted in a return.

TTFN,
  Mike
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Re: [vox-tech] Demo Machine: Stopped Rear Case Fan.

[Bill Broadley]

On Fri, Jun 07, 2002 at 05:50:33PM -0400, [EMAIL PROTECTED] wrote:
>   A while back I commented that the read case fan had failed.
> One of the things I did yesterday was to swap the front and rear case
> fans to see if the fan was operational or not.  It turns out that the
> fan is 100% operational...

I assume the old front fan that is the new rear fan didn't spin up.

>   I think the motherboard isn't suppling power to the back case fan
> connector.  I checked the motherboard manual and there is no BIOS option
> which may do a temperature based or power conservation stop of the fan
> is on.

It's likely dead, abit bp6's are famous for this, no idea what
kind of motherboard this is.

>   Another defect appears that the SMBus chips can not read the 
> CPU1 Fan speed... I connected one of the case fans (which are
> known to report RPM information) to the CPU fan connectors... and
> while they spin there is no RPM information available.

Is the cpu1 fan connector connected to a fan with 3 wires?  2 wire
fans will spin but not show rpm.

> - Someone with electrical skills want to test out the three pin 
>   fan connector to figure out what is going wrong?

I'm betting on a short.

> - Any suggestions on how to get the fan spinning? (1)

Get an adapter from the standard 4 pin power supply to whatever
the fan takes.

> - Has anyone else seen motherboards fail to spin fans like this?

Common on abit's, most often when using a higher performance (more
power hungry) fan, or when plugging/unplugging fans while
the machine is on.


-- 
Bill Broadley
Mathematics/Institute of Theoretical Dynamics
UC Davis
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Re: [vox-tech] Demo Machine: Stopped Rear Case Fan.

[Henry House]

On Fri, Jun 07, 2002 at 05:50:33PM -0400, [EMAIL PROTECTED] wrote:
>   A while back I commented that the read case fan had failed.
> One of the things I did yesterday was to swap the front and rear case
> fans to see if the fan was operational or not.  It turns out that the
> fan is 100% operational...

Actually that fan has never worked.

-- 
Henry House
The attached file is a digital signature. See 
for information.  My OpenPGP key: .



msg02813/pgp0.pgp
Description: PGP signature

Re: [vox-tech] Demo Machine: Stopped Rear Case Fan.

[nbs]

On Fri, Jun 07, 2002 at 05:50:33PM -0400, [EMAIL PROTECTED] wrote:


Just make sure it works by June 26th, for my Zaurus talk at Davis PCUG! ;)

-bill!
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[vox-tech] Demo Machine: Stopped Rear Case Fan.

[msimons]

  A while back I commented that the read case fan had failed.
One of the things I did yesterday was to swap the front and rear case
fans to see if the fan was operational or not.  It turns out that the
fan is 100% operational...

  I think the motherboard isn't suppling power to the back case fan
connector.  I checked the motherboard manual and there is no BIOS option
which may do a temperature based or power conservation stop of the fan
is on.

  Another defect appears that the SMBus chips can not read the 
CPU1 Fan speed... I connected one of the case fans (which are
known to report RPM information) to the CPU fan connectors... and
while they spin there is no RPM information available.

- Someone with electrical skills want to test out the three pin 
  fan connector to figure out what is going wrong?
- Any suggestions on how to get the fan spinning? (1)
- Has anyone else seen motherboards fail to spin fans like this?

TTFN,
  Mike

1) Next time I power cycle the machine I'm going to try to connect the
back case fan to the idle CPU2 fan connector... it might just reach.
If that fails I'll look for a standard drive power to mini-fan power
convertor dohicky at Fry's.
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