[rescue] E4500 questions

M Thompson m_thompson at ids.net
Mon Sep 6 19:17:24 CDT 2004

>heat sinks also just come loose with "age".
>i have this happen to a dozen of these system boards just sitting/running in
>servers that were never moved after installation.
>sun told me the "glue" loses its ability to hold the heat sinks in place
>(and, if there are plastic clips, they get brittle).
>i have had this happen to least a dozen of these system boards.
>sun replaces the system boards if they are under contract
>(and i have replaced a dozen of these system boards).

There are two designs of boards. The early ones have heat sinks that are
made by TYCO. These have a "C" shaped base that clips over the chip and the
heat sink screws into the base. There is a very small tang on the base that
holds it onto the chip. A very small shock can break the tank off and the
heat sink comes loose.

You can scavenge heat sinks from a donor board by unscrewing the heat sink,
sticking a small screwdriver into the slot at the side of the base,
carefully prying the tang away from the side of the base, and lifting the
base off the chip.

The newer boards have a heat sink that is glued to the chip. I haven't seen
the glued ones fail yet.

Michael Thompson
E-Mail: M_Thompson at IDS.net

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