I got a PC from garage sale, and within a few weeks the mesh on the
power supply is coated in lint. It is sucking air in, whereas my other
desktops are blowing air out the back of the power supply.
It is a Silverstone 500 watt. Perhaps the fan got installed backwards?
Or otherwise would it be a special model to go with a case having a
matching vent for power supply?

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Woozy Song <[email protected]> wrote:

I got a PC from garage sale, and within a few weeks the mesh on the
power supply is coated in lint. It is sucking air in, whereas my other desktops are blowing air out the back of the power supply.
It is a Silverstone 500 watt. Perhaps the fan got installed backwards?
Or otherwise would it be a special model to go with a case having a
matching vent for power supply?

In all my years I never had a PSU that sucked air in. Possibly a mistake
in assembly, either fan the wrong way around or soldered to the
circuitboard with the terminals reversed?

Shouldn't take too much time or effort to fix.

--

IanJ

gopher://gopher.icu

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IanJ <[email protected]> wrote:

Woozy Song <[email protected]> wrote:

I got a PC from garage sale, and within a few weeks the mesh on the
power supply is coated in lint. It is sucking air in, whereas my other desktops are blowing air out the back of the power supply.
It is a Silverstone 500 watt. Perhaps the fan got installed backwards?
Or otherwise would it be a special model to go with a case having a matching vent for power supply?

In all my years I never had a PSU that sucked air in. Possibly a mistake
in assembly, either fan the wrong way around or soldered to the
circuitboard with the terminals reversed?

Shouldn't take too much time or effort to fix.

I suppose it's possible to arrange the airflow that way, in some kind of
custom build (maybe a Dell or similar box where they do proprietary things because they can), but I'd have thought it would be better to blow the
coldest air at the CPU heatsink, with that air going afterwards to the PSU. Rather than prewarming the air on the PSU before blowing it at the CPU.

Although there are modern cases where the PSU lives at the bottom, and maybe cold air entering from there might make sense? But I think they do things
like having a separate air tunnel for the PSU so it doesn't mix with CPU
air.

I would guess somebody has taken the PSU apart at some point and put the fan
in backwards. Maybe they did it to change or lubricate the fan?

Theo

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On 27/06/2023 in message <Nhn*[email protected]> Theo wrote:

Although there are modern cases where the PSU lives at the bottom, and
maybe
cold air entering from there might make sense? But I think they do things >like having a separate air tunnel for the PSU so it doesn't mix with CPU
air.

Mine are like that. Air in to the PSU underneath and out at the bottom
back of the case. Presumably that keeps it pretty well separated from the
main case airflow.

--
Jeff Gaines Dorset UK
All those who believe in psychokinesis raise my hand.

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On Tue, 27 Jun 2023 14:32:53 +0800, Woozy Song wrote:

I got a PC from garage sale, and within a few weeks the mesh on the
power supply is coated in lint. It is sucking air in, whereas my other desktops are blowing air out the back of the power supply.
It is a Silverstone 500 watt. Perhaps the fan got installed backwards?
Or otherwise would it be a special model to go with a case having a
matching vent for power supply?

Silverstone make home theatre cases so perhaps this is designed for one of them?

Cheers



Dave R


--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

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