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TPA3130D2: Doesn't work when is Faultz High

Part Number: TPA3130D2


I designed a PCB with the TPA3130 but is doesn't work.

I connected 12V measured the voltage on the FAULTZ pin (which is High 10,6V) but the speakers stay quit. When I measure the SYNC pin I receive a clock puls. So I presume the amplifier is working. But I don't receive any audio on the output.

Does anybody has an idea?

Best Regards