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DAC+ how to debug system

Hi everybody,

my one year old dac+ pro suddenly stopped working, at least there's no audio output anymore (plain mpd setup with alsa and pulseaudio). Not sure, whether this was connected to a system upgrade.

aplay -l says:

aplay: device_list:268: keine Soundkarten gefunden ... (no sound cards found)

Also booted the pi with the raspbian image provided by hifiberry team - same result.

How can I debug the system to exclude hardware failure?

Configuration: Pi3 with Raspbian (kernel 4.9.13-v7+)

syslog shows:

snd-rpi-hifiberry-dacplus soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry

sometimes also:

snd-rpi-hifiberry-dacplus soc:sound: ASoC: CPU DAI (null) not registered - will retry

vcdbg does not show any errors (to my understanding..) loading the devicetree overlay.

snd_soc_hifiberry_dacplus kernel module is loaded

Thanks in advance!

Andreas

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