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#1 |
Miggy Ate My Hamster!
Join Date: Nov 2008
Location: Lancashire, UK
Posts: 1,566
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Amiga RF shield corroding or tarnished?
Just opened up my A1200 for the first time in years and i have noticed the metal RF shielding is not as shiney as it used to be
![]() I don't understand how this has happened as all my systems are kept in mint condition and have never been stored in a loft or garage? My house is usually quite warm and never gets cold or damp ![]() Its not rust either... it looks like the metal has tarnished or oxidized and i don't think its corrosion? I have noticed a few amiga's that have this happening to the metal shields so i guess it's a common thing ![]() Instead of it all being nice and shiney the metal shields have dull grey patches ![]() Anyone else have this problem and know why it happens?? |
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#2 |
Global Moderator
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
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Hi PowerPie,
I guess this is because the RF shield is not chromium plated, as it might appear when new, but tin plated. Tin plate is used because it's marginally softer than chromium plate and won't be so likely to peel from the base metal, which can be a problem with chromium plating. Tin isn't quite so inert as chromium, so is less resistant to tarnishing. Of course, the shield might well be solid tin, but I don't think it can be because tin is actually very expensive. A better (and more cost-effective) solution these days would probably be nickel plating. prowler |
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#3 |
Miggy Ate My Hamster!
Join Date: Nov 2008
Location: Lancashire, UK
Posts: 1,566
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So i guess it just goes this way as it gets older? I have always assumed systems have been left in damp/cold conditions when i see this
![]() I assume alot of people have the same issue with the metal shields in their amiga's? Well i can solve that problem by buying some new shielding or doing a bit of handy work with some primer, car spray paint and lacquer ![]() |
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#4 |
He found it at the zoo..
Join Date: Jun 2008
Location: Townsville / Australia
Posts: 151
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Any moisture from the air that settles on it will have a negative effect - a tin can will still get some corrosion on it even if it's left indoors. Also my machine went this way after a few house moves, probably because of plugging and unplugging cables, which eventually strips into the plating.
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#5 | ||
Global Moderator
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
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Quote:
Quote:
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#6 |
Miggy Ate My Hamster!
Join Date: Nov 2008
Location: Lancashire, UK
Posts: 1,566
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Ok i will scrap the paint idea then
![]() ![]() ![]() so it's nothing to worry about ![]() |
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#7 |
I hate potatos and shirts
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There is a way to make the tin become as new, but it is dangerous and expensive:
You just need to force hot hydrogen trough the corroded area and a reaction will take the oxygen from the board in form of evaporated water. Why dangerous? Because hydrogen is explosive! Think "big baddabuuuuum"! ![]() |
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#8 |
Registered User
Join Date: May 2001
Location: ?
Posts: 19,651
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I still don't understand why people want to keep this thing.
Remove it and e done with it! |
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#9 |
Global Moderator
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
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#10 |
. . Mouse . .
Join Date: Jun 2005
Location: Nowhere
Age: 55
Posts: 1,792
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I love my RF-Shields:
Once they're done slicing holes out of my fingers I re-cycle them as useful bits of metal for other projects... ...HDD / floppy brackets, the occasional IO shield. I don't think I own a single computer with an intact shield. ![]() Last edited by Charlie; 22 March 2009 at 00:58. |
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#11 |
I hate potatos and shirts
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Of course, none of my Amigas have the upper part of the shield from a very long time...
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#12 |
Zone Friend
Join Date: Sep 2006
Location: Bathurst Australia
Posts: 281
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Truth be known, I don't think the shielding has any effect to or from the amiga itself other than "maybe" reducing the interference to my AM radio dial when in use.... but then again I wouldn't know if there is any difference as I too don't use the shield !!!
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#13 |
I hate potatos and shirts
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Wedge Amigas already have the metal on the back of the keyboard, so why another tin ware inside?
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#14 |
Global Moderator
Join Date: Aug 2008
Location: Sidcup, England
Posts: 10,300
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#15 |
-
Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,910
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Because of FCC.
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#16 |
1 Potato to Spam´em all!
Join Date: May 2008
Location: Lost in a Wine Country
Age: 48
Posts: 572
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Indivision Aga Scandoubler mounting instructions advice the use of the top RF shield, in their opinion, the computer will suffer from random crashes and RF interference can affect Indivison´s signal.
Anyone experienced this? |
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#17 | |
Registered User
Join Date: Feb 2009
Location: Glasgow, Scotland
Age: 44
Posts: 637
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Quote:
Nope. Run my indy without top RF shield and a CF card sitting on top of it (Brutalized the RF shield bigtime ![]() ![]() Andrew ![]() |
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#18 |
Banned
Join Date: Jan 2010
Location: france
Posts: 932
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