Max2Play Home 2016 (en) › Forums › General Questions on Hardware and Max2Play Versions › Pi3B+ and IQaudioO Pi-DAC+ Pro: no sound › Reply To: Pi3B+ and IQaudioO Pi-DAC+ Pro: no sound
Sounds like this could be a hardware problem either on pi or on your soundcard.
I’m sure that you have dobb. checked /boot/config.txt that you have only one entry of: dtoverlay=iqaudio-dacplus
Well Im out of suggestions for you to try now, maybe someone from Max2play can be of better help, good luck!!