How does one even figure out which chip has gone haywire? If a board breaks and I don't see a bad cap, a cluster of moths, or other obvious problem, I bin it.

How does one even figure out which chip has gone haywire? If a board breaks and I don't see a bad cap, a cluster of moths, or other obvious problem, I bin it. Last week I did resurrect my dualie 400GB DDR3 Supermicro beast.. it had been infested by moths. After cleaning them all out with tweezers, to my amazement, the thing works again. Thank you, X9DRi-LN4F+.