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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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 Posted: Sun Oct 16, 2011 8:58 pm Post subject: IBM 4341 INSIDE THE WHITE CERAMIC CPU |
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Hi all,
I have a damaged IBM 4341 cpu. I want to know what under the gold heatspreader so I decided to put it on the fire (my home Gas device) for over 20 minutes. I guessed the gold heatspreader will melt down but it didn't. After heating it for over 20 minutes, the pin nearly melted down but the gold heatspreader was still there .
So I finally used the hammer to open it. Woo too beautiful cpu.  |
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Sun Oct 16, 2011 9:01 pm Post subject: |
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very nice mate 
and I see you have your father's trusty hammer there for scale 
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Sun Oct 16, 2011 9:08 pm Post subject: |
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| Neon_WA wrote: | very nice mate
and I see you have your father's trusty hammer there for scale |
Not for the scale. I used it to open the cpu.
BTW, will the gold heatspreader are all pure gold? I have such thinking because after put it on fire over 20 mins, it didn't change its color and shape. |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Sun Oct 16, 2011 9:11 pm Post subject: |
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| bccwchan wrote: | | Neon_WA wrote: | very nice mate
and I see you have your father's trusty hammer there for scale |
Not for the scale. I used it to open the cpu.
BTW, will the gold heatspreader are all pure gold? I have such thinking because after put it on fire over 20 mins, it didn't change its color and shape. |
If the heatspreader was all gold the value would be so high that collectors would never be able to afford them, as I'm sure a lot of gold refiners would know about that much gold.
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Sun Oct 16, 2011 9:13 pm Post subject: |
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interesting thing is that the heat-spreader doesn't seem to be in contact with the dies 
so it seems it is only to protect the dies
_________________
There are 10 types of people in this world:
those who understand binary and those who don't. ~Author Unknown
http://www.x86-guide.net/Neon-WA/en/collection.html |
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Glory_Cloud
Joined: 24 Jul 2010
Posts: 2942
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| Posted: Sun Oct 16, 2011 9:19 pm Post subject: |
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Put a magnet next to the gold heat spreader and see what happens.
Pure gold is not magnetic.  |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Sun Oct 16, 2011 9:35 pm Post subject: |
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| Glory_Cloud wrote: | Put a magnet next to the gold heat spreader and see what happens.
Pure gold is not magnetic. |
OK, will give it a try.
Thank you  |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Sun Oct 16, 2011 10:11 pm Post subject: |
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Just put a magnet next to the gold heatspreader.
The gold heatspreader is magnetic so it is not pure gold.
Thanks Glory_Cloud teach me this easy method for testing. |
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UMMR
Joined: 23 Aug 2007
Posts: 381
Location: Udine, ITALY
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| Posted: Mon Oct 17, 2011 3:17 am Post subject: |
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Hi,
very nice. Chips inside are bipolar (ECL) logic, up to 704 gates each. |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Mon Oct 17, 2011 4:07 pm Post subject: |
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cool hammer, really! nice find unde the hood too:-)
but impressing you melted down the pins with no reaction on the lid.
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You may use the photos I have posted here under CC BY-NC-SA license. |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Mon Oct 17, 2011 8:01 pm Post subject: |
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| wepwawet wrote: |
impressing you melted down the pins with no reaction on the lid. |
Yes, i'm lucky to only "remove" the pin but not the lid/die.
Here is the close-up of the lid/die. |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Tue Oct 18, 2011 1:14 am Post subject: |
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die = chip/silicon
lid = metal cover/the golden piece you removed.
... but yes, it could happen the die gets removed too.
Happened to me with the first C4002-2 I opened with a heat gun. When the metal lid was removed after ten minutes of maximum heat the die was slipped in a corner.
I think the best method of removing a lid is both heat and mechanical help, the heat is often sufficient to melt the solder but the lid does not slip away. Then a needle can do a good job. |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Tue Oct 18, 2011 1:38 am Post subject: |
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| wepwawet wrote: | die = chip/silicon
lid = metal cover/the golden piece you removed.
... but yes, it could happen the die gets removed too.
Happened to me with the first C4002-2 I opened with a heat gun. When the metal lid was removed after ten minutes of maximum heat the die was slipped in a corner.
I think the best method of removing a lid is both heat and mechanical help, the heat is often sufficient to melt the solder but the lid does not slip away. Then a needle can do a good job. |
Thanks for your info. 
My next target is this IBM cpu.
I don't know whether it's good to use the fire (my home gas device) to detach the lid.
Is there any suggestion if no heat gun is available to use. |
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Marcin
Joined: 02 Jan 2005
Posts: 8519
Location: Poland
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| Posted: Tue Oct 18, 2011 1:56 am Post subject: |
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| bccwchan wrote: |
My next target is this IBM cpu.
I don't know whether it's good to use the fire (my home gas device) to detach the lid.
Is there any suggestion if no heat gun is available to use. |
Better buy a heatgun. There are big blue cores under that lid if I good remember. A friend of me have removed the lid a years ago. |
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bccwchan
Joined: 20 Sep 2004
Posts: 2585
Location: Hong Kong
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| Posted: Tue Oct 18, 2011 2:23 am Post subject: |
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| Marcin wrote: | | Better buy a heatgun. There are big blue cores under that lid if I good remember. A friend of me have removed the lid a years ago. |
Thanks for your advice.
Will consider to buy a heatgun to safely remove the lid. |
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