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- Mar 6, 2016
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All the grounds are connected on the pcb. The issue is SDN not shorted high.One thing I see is missing a ground wire in between the "INL" & "INR"... that might be the problem. I think that is the internal ground for the speaker input.
I have 5 of the same audio amp from Amazon for my projects along with the specs sheet but haven't wired the up yet. Looking at the spec sheet I don't see a "SDN" anywhere on it. There is a "SHDN" that has a description of "Shutdown Control Input(active low), pull-down".