![]() the TVS burned itself out (while shorted) so much that it became open circuit, due to a power source which didn't shut down. The only scenario I can think of, where the initial symptom and the OP's latest report that the 12V TVS was "open" both match, is that things changed e.g. That fits with the initial symptom of no spin-up (due to the (likely) shorted TVS being a crowbar across the input power source). That's why I previously asked if other info was missing.Īlso, we have circumstantial evidence that at the start of the thread, the 12V TVS was (as you said, and I agree) shorted. ![]() Yep, I've seen all that before several times too - but the OP has not reported any other faults than the 12V TVS, therefore there is no evidence being given by the OP of other damaged components. Unfortunately if the power source dosn't for some reason shut down the tvs will burn out very often causing further damage to the pcb and also to other critical components. ![]()
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