I think you mean this one.Hi,
Because there is a square wave test you can do if you can monitor with a scope.
I'll see if i can find the pdf or you can search yourself.
If this problem is subtle you may have to resort to testing and logging, then shipping, then noting which ones came back and which ones didnt, then compare waveforms so in the future you can start to predict which cones would come back and simply dont use those. As time goes on you should be able to narrow it down to which cones will fail. This is like a last resort.
haha, wel thats a way to narrow it down indeed. Great input!