Aporte original por: Platypus ,
I know this is probably too late, but this is a classic Audio IC failure. As for checking it, there’s really no way to other than ensuring you have good parts. The problems are caused by a broken connection under a chip. Since the pad goes to a tiny resistor, you could try measuring it against a known good board, but there’s really no use. This issue is so widespread that the Audio IC will have a broken pad in 99% of these cases.