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Raspberry Pi Zero W: No sound

Dear HifiBerry community,

I am struggling to get audio from my Raspberry Pi Zero W with a Hifiberry DAC+ Zero RAW, which adds a 3.5 mm output to the HAT.Neither 3.5 mm nor Cinch output work. PI musicbox v0.7.0RC7 runs on the system. However, the same prolem occured with Volumio.

If I use the HDMI output it works flawless. The soldering connections of the GPIO were checked using a multimeter. Do I need to solder more than the GPIO and output ports on the HAT?

"aplay -l" delivers following print:

**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
Subdevices: 7/7
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
Subdevice #4: subdevice #4
Subdevice #5: subdevice #5
Subdevice #6: subdevice #6
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0

Because it seems like the card1 needs to be selected, I added following setting in /etc/asound.conf (which did not solve the problem):

pcm.!default {
type hw card 1
}
ctl.!default {
type hw card 1
}

Link to the HAT:
https://www.berrybase.de/raspberry-pi-co/raspberry-pi/erweiterungsboards/hifiberry/hifiberry-dac-43-zero-raw

Thanks in advance for helping me!

Kind regrds,

Steffen

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