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From: Mick <michaelkintzios@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Filthy oscilloscope picture! =P
Date: Sun, 23 Aug 2015 12:14:58 +0100
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On Sunday 23 Aug 2015 01:11:03 Fernando Rodriguez wrote:
> On Saturday, August 22, 2015 3:19:50 PM Alan Grimes wrote:
> > Isn't this the filthiest oscilloscope u've seen recently?
> >=20
> > The only bare metal contact that I could safely use to get a reading off
> > was a +12v line on a spare PCI-E gpu plug. The ground reference is the
> > chassis.
> >=20
> > You can see the machine's settings in the photo clearly enough. The
> > waveform is fairly constant, it stays in this mode most of the time but
> > sometimes goes into a "low ripple" mode where the ripple falls to +/-
> > 20mv and holds tight. The scaling indicates the upward spikes are around
> > 0.120 volts and the downward spikes are about 0.22 volts. This
> > __SHOULD__ be within the input tolerances of the motherboard's
> > regulators.
>=20
> Regulators don't filter noise, they introduce it. Capacitors do that as
> somebody pointed on the other thread.
>=20
> So if you're on a tight budget and you have an electronics surplus store
> nearby you can replace all the capacitors on your mobo and PSU (except the
> big bulky ones on the PSU) for about $3.
It is quite likely that only the secondary circuit on the PSU needs to have=
=20
its electrolytic capacitors replaced. We're talking of anything between on=
e=20
to half a dozen of capacitors. In all likelihood less than a $1 to $3. If=
=20
any are even slightly domed I'd start with those and spend no more than a f=
ew=20
cents.
Primary circuit ceramic capacitors (transient protection) could have been=20
affected if the PSU was submitted to high surges in the mains supply. I ha=
d=20
one go bad on me after sheet lightning hit the area once. Its replacement=
=20
along with a resistor fixed the PSU without any further problems and to muc=
h=20
of my surprise - I thought it was a gonner!
Domed capacitors on the MoBo is a different story. Quite likely other=20
components would have been affected and many of them are surface mounted. =
=20
You'll need a magnifying glass and steady hands for those. It is not=20
something I would attempt in haste, as it is easy to damage more components=
=20
than what you fix on a MoBo. YMMV.
PS. Noisy PSUs are nothing new. The noise is can be caused by the capacito=
rs,=20
or the coils. Although annoying it does not necessarily mean that there is=
an=20
electrical problem with the components. If the fan is rattling, then a dro=
p=20
of oil on its bearing should soon put a stop to this. As Dale mentioned, a=
=20
stalled fan will not help the longevity of the remaining components. :-)
=2D-=20
Regards,
Mick
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