dell PSU fan noisy

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Fan wires are soldered to the psu board. Should I buy the new fan and cut
old wires and solder new fan wires. Does the voltige on all fan is the same?

Boba Vancouver

Re: dell PSU fan noisy

On Thu, 10 Nov 2005 06:46:24 GMT, "Boba & Ilinka"

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Difficult but most elegant way-

Pull whole PSU board out, remove the PSU fan wires and
solder in a pin header.  If spacing of pins makes that
impossible then solder new fan leads directly to PCB.

Of course with the pin header you also need a fan having
compatible pin socket.

Easier way - snip the fan leads close to the body of the old
fan.  Strip insulation off of them, and the new fan leads,
slip some heatshink tubing over the leads towards the base
of the wires (away from heat while soldering), solder the
wires, slip the heatshrink tubing over the solder joints and
heat to shrink-seal the connection.

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The most common "PC" fan voltage is 12V.  The most common PC
PSU fan voltage is also 12V.  It is common for misc non-PC
fans to come in other voltages, and rarer but not
theoretically impossible for a PSU fan to be other than
12V... though offhand I don't recall ever seeing a PC PSU
fan that wasn't 12V.

In other words, read the fan label, it should state voltage.
Otherwise it is reasonable to gamble and assume the PSU fan
was 12V and needs another 12V fan for replacement.

Also signficant is the fan speed.  If you can find the spec
sheet for the original fan online you may have some idea,
but some fans are OEM runs and the speed might vary from a
generic fan family spec sheet's listings.  Compare the fan
amperage on the fan label to the spec sheet as there is
direct correlation in amperage and speed among same size and
voltage fans.  For similar noise levels and cooling, choose
a replacement fan with similar amperage.

Avoid questionable quality sleeve-bearing (or single
ball-bearing plus sleeve bearing) fans for a PSU exhaust as
they have short lifespans in such uses unless they have a
very good bearing and lube system- which most unknown or
low-end fans don't.  Dual ball bearing name-brand (fan
manufacturer brand, not fan relabeler-for-PC-products) fans
are the best choice for this use.

Re: dell PSU fan noisy

Boba & Ilinka wrote:
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maybe you can buy a quiet power suply , get a standard ATX to Dell
adaptor, this is important(assuming dell PSUs are still wired
would a standard atx PSU fit in your dell case though? u may have to
modify the case.

if you do modify your Dell PSU though,
you could run a fan at less than 12V(zalman fanmate or rheostat) but
you don't want the psu to overheat. A superdooper temp sensing fan that
adjusts RPM woyuld be nce. i've heard of cpu fans that do it.

you might end up replacing your PSU fan with a case fan. I think you'll
find PSU fans are 2 wire. CPU fans are 3 wire.  you'd ignore the sensor
wire. whatever colour that is. i guess you'd need to know! but I think
it may vary. I thhink the 3 wires are red,black and other. other is
sensor wire.  perhaps it's yellow? not sure.

Re: dell PSU fan noisy

On 10 Nov 2005 01:51:53 -0800,

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Fans with their own integral thermal throttling should be
used with caution or completely avoided in many power
supplies.  Often a supply has it's own separate fan
throttling circuit and when used in conjunction with a fan
that has it's own, the fan may not spin up upon power-on, or
may inappropriately turn off later.

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