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Re: damaged sidecar
It is entirely a value judgement, I am only giving an opinion based on what known modes could have occurred to create the symptoms you described. You have better access to the board, and can therefore make a better judgement than I can.
From my viewpoint, I am assuming that this board has already experienced two damaging events: ESD and reversed input polarity. Both of these can stress the rest of the components on the board, which is something I personally don't want to deal with in competition. It may work perfectly, but it is forever less reliable than a board that hasn't been stressed in these ways.
Unfortunately, I don't know of a way to test for these stresses other than to wait for them to result in further failures.
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