This is a tool only.

The non-function should be diagnosable to more orders of magnitude of
accuracy than you are stating. if it is timing only.

If the freeze spray trick is repeatable, a competent design engineer should
be able to give you more informational symptoms than just "it goes now".
That's how you'll find your answers using this tool.

RL

RL
----- Original Message -----
From: "Ken Carlile" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 24, 2002 12:11 AM
Subject: [TN] Freeze Spray Trouble Shooting


> We recently received a prototype batch of 4 boards and experienced 4 for 4
> failing test.  Our techs sprayed down certain chips with Freeze Spray and
> the board began working properly, at least for a short period of time.  I
> have checked prior tech net postings and have found fantastic responses as
> to why Freeze Spray can damage a the IC or board, but can anyone explain
why
> they would begin functioning properly.  Being a rookie component engineer
I
> can fully understand the issues related to freeze spray, but out techs and
> design engineers are just going to point the finger since their units work
> when sprayed.  To further complicate the matter the chips that are being
> sprayed are not all the same manufacturer and I can easily rule out a
> component failure.  Our senior engineer thinks that it may be timing
related
> since the main circuit being froze is the Altera PLD (20K400E) and related
> circuitry.
>
> Can anyone defend the use of Freeze Spray?
>
> Can anyone present a logical failure mechanism?
>
> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
>
> The best Freeze Spray argument to date was Werner Engelmaier's:
>
http://jefry.ipc.org/scripts/wa.exe?A2=ind9907&L=TechNet&D=0&m=23823&P=55370
>
> However this points to failure after spray not the opposite.
>
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