7i76e PWR FAIL

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16 Feb 2024 22:49 #293548 by atlantis
7i76e PWR FAIL was created by atlantis
Hi

I have a 7i76e that was given to me a longer time ago because it was faulty and I don't know what happened to it exactly. It's been sitting on the shelf ever since until I stumbled over it lately.

A visual inspection turned up nothing unusual, no holes in chips where magic smoke might have escaped. Upon applying power the field power led is lit as well as the pwr fail led. I checked and 3v3 is indeed shorted. In addition the ethernet controller chip gets hot, not smoking hot but definitely hotter than it should get.

Should I expect the ethernet chip to be the cause or is the cause rather somewhere else and it getting hot is just a symptom?

Kind regards
Martin

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16 Feb 2024 22:59 #293550 by PCW
Replied by PCW on topic 7i76e PWR FAIL
If the Ethernet chip is hot, its likely been damaged by ESD

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16 Feb 2024 23:11 #293551 by atlantis
Replied by atlantis on topic 7i76e PWR FAIL
Ok, I think technically I could replace it but do these chips have internal firmware that needs to be programmed?

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16 Feb 2024 23:22 #293552 by PCW
Replied by PCW on topic 7i76e PWR FAIL
No, the Ethernet chip has no non-volatile memory

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16 Feb 2024 23:29 #293553 by atlantis
Replied by atlantis on topic 7i76e PWR FAIL
Very good, thanks!

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