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OpenVMS Hobbyist Program | Alpha Systems Forums | Alpha Hardware Forum
Author Questions about some chips

Posts: 11
Location: Phoenix, AZ
Joined: 21.03.08
Posted on January 05 2012 02:58
When I first bought my AlphaServer 800 it had a blown processor board which I replaced. Since then I've had this dead board sitting around -- I hope to remove the Alpha chip for display purposes.

I was looking at it yesterday and wondered about removing some of the other chips to use on bolo ties. I'm sure I would be asked what they are so I want to know what they are. A few quick online searches only found companies that might have them for sale, but no information on what they are.

So, what is an L1B9762? There are four and they surface mount, so should be easy(er) to remove.
And what is an L1A9756?
These are on a 54-24801-01 board.

And any ideas about unsoldering the CPU would be appreciated as well -- damage to the board is not a concern.
Author RE: Questions about some chips

Posts: 108
Joined: 12.03.10
Posted on January 06 2012 02:42
For $17 you can egt a product called CHIPQUIK which will allow you to remove the surface mounted ICs without damage. This is the easiest to use. Basically, this product will "replace" the solder and prevent it from sticking to the pads.

Author RE: Questions about some chips

Posts: 87
Location: The Netherlands
Joined: 28.03.10
Posted on January 06 2012 05:14
Thanks for the advice abrsvc, that sounds interesting and useful. I'm going to try it sometime.

Author RE: Questions about some chips

Posts: 108
Joined: 12.03.10
Posted on January 06 2012 08:29
I use the mentioned product all the time when repairing electronics devices. I have successfully repaired professional cameras, computer boards and high end audio using this to replace blown ICs. Soldering the ICs back on is another story that requires additional equipment, skill and patience...
Author RE: Questions about some chips

Posts: 60
Joined: 24.05.08
Posted on January 08 2012 06:20
While the AS800 doesn't have exhaustive technical information, based on what else was coming out of DIGITAL at the time I wouldn't be surprised if they were similar to the 21171/21172 ALCOR core logtic, with the set of 4 being data chips while the singleton is a control chip.
Author RE: Questions about some chips

Posts: 60
Joined: 24.05.08
Posted on January 13 2012 06:24
Checked out on my AS1000A and PC164 - those chips are the DEC 21172 ALCOR chipset. The 4 are the data chips, the single BGA is the control chip.

If you look on the second line they will say "21172-(x)A" where X is probably "B" (data) or "C" (control).

For desoldering get yourself a hardware store heat gun. Unless you're planning on using the 21164 in another project you don't really need to worry about functionality there either.
Edited by saq on January 13 2012 06:26
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