Hello,
Last time(s) I found similar symtoms (in somewhat different equipments), the
main culprit was a tantal capacitor failed in short-circuit mode. It could
be worth a check...
HTH,
Best regards,
Jean-Louis
----- Original Message -----
From: "Hal Murray" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Sunday, November 28, 2010 8:13 PM
Subject: Re: [time-nuts] Dead Thunderbolt Explored - Any Chance of
Resurrection?
1. Is it likely that the FPGA is the culprit or just the victim of
another
failure?
It could be getting hot trying to drive some signals while some other chip
is
driving it in the other direction.
You might poke around and see if you can find any signals that aren't at a
clean high or low.
Or look for signals that are shorted to Gnd or Vcc. Maybe add a few mA of
load and see if they shift a bit.
2. What is the likelihood of repair?
My guess would be low, but what do you have to lose if you feel like
trying
something?
--
These are my opinions, not necessarily my employer's. I hate spam.
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