24 Feb
2014
24 Feb
'14
12:10 p.m.
On Mon, 24 Feb 2014, Paul Koning wrote:
On Feb 24, 2014, at 2:49 PM, Terry Stewart <terry at webweavers.co.nz> wrote:
White gunk will hurt cooling, not help (white interferes with
radiational cooling).
I take it you?re assuming it is silicone thermal grease. That?s
plausible. But silicone grease only helps cooling if you stick it (in a
*thin* layer) between the device and a suitable heat sink. The heat
sink actually does the cooling.
The heat sink paste is typically only used if there's some kind of
mu-metal RFI shield in place over the board - a good example of this is in
the Commodore 128 where bent out tabs in the mu-metal shield act as
heatsinks - each chip that has a tab resting on it has a small amount of
white heat shrink paste on it.
g.
--
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If you
were lucky, it might overheat and set fire to your house. Then
you could claim the insurance money.
I noticed the video chip was covered with a white gunk in a couple of the
units I opened in order to reconstitute my working one. I understand this
is some kind of substance which aids with cooling so that chip at least
runs very hot.