Mark,
That is very interesting, and, I suppose it is possible. I always thought
that aluminum was not susceptible to magnetic fluxes. And the plate really
did not show much "dust" at all; one of the other reasons I chose these
cases years ago. The front filter catches most of it, and, the rear output
seems to collect most of the rest. They just do not collect much dust at
all between cleanings every 6 months or so.
Showed the marks to my BIL last night. He is an industrial electronic tech.
Since 2004 he has already regaled me with many observations he has seen
that often defy common electrical knowledge. He agreed that while the marks
appear to be arc sites, he discounted that the source was the back of the
m/b. Hmm....... Odd, because all these PC's connect to the AC mains via
their own ups. And, they have survived numerous weather related electrical
storms both here in Georgia and SoCal.
Still a bit of a mystery, but I will check for this potential aging symptom
as I continue my upgrades of these 3 aluminum cases.
Thank you.
Duncan
At 09:28 11/08/2008 -0600, you wrote:
These could be corrosion at areas of magnetic influences along with dust,
lots of metal in dust....
Very well could look like electrical arcing.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of DHSinclair
Sent: Friday, November 07, 2008 11:59 AM
To: Hardware Group
Subject: [H] riddle me this?
I have de-commissioned my old Abit BX6r2. Somehow that old m/b surely may
have something sick somewhere inside. I suspect the hard drive/CDROM logic
(pata?) is dorked. No issue.
Now that I've torn the system down, I find an alarming observation to share.
I accept that m/b's deal with high I/low E circuitry. But, I never
expected this high I/low E circuitry to ARC to the aluminum m/b tray
(Lian-Li PC69)! I've been looking at the tray with the highest
magnification I have, and, it seems that this tray exhibits ~30 sites that
sure do look to me like ARC sites! These sites appear to align with the
old NorthBridge chip, the VR's for the cpu, and some align with the RAM
modules. Has anyone else noticed this with and Aluminum m/b tray?
I thought I remembered what an ARC site looked like, but, I suppose I could
just be looking at general Aluminum corrosion over time. These Aluminum
cases are ~9yrs old now. (They take a licking! And, keep on ticking!)
I have never seen this before. Curious? Yes, does add credence to me that
the old BX6r2 was on the way out! Still, I wonder. I do know that the
ground continuity of the case is solid; always has been. And, all of the
m/b mounting clips still meet the normal height standard (not crushed).
Thoughts? Other observations?
Thanks,
Duncan
