Phat Dac w/o sound output, but digital monitoring suggests otherwise


Hi, I’ve just soldered on a Phat Dac and attached it to a 3b+ pi and have followed the installation instructions (both manual and via the script to double check).

All audio input shows that output is playing on the digital side (via aplay --vv cmd outputs and monitoring on pavucontrol), but there is no output through the 3.5 jack (tested on in-ear headphones, a pair of JBL headphones, as well as a mains-powered speaker system). I’ve double-checked the soldering and they seem OK - not the prettiest but looks like the connections are solid.

aplay -l lists the device correctly (sndrpihifiberry [snd_rpi_hifiberry_dac]). I’ve posted on the discord channel and had a brief chat with sandyjmacdonald who recommended I post this in the forums.

Can anyone help please?



I’ve checked and resoldered the connections yesterday, and also tested the sound with test-sound with no success. I’ve attached photos from Discord of the soldering, and also of a screenshot where one can see an output being associated with the phat dac (or hifiberry?) but no sound actually coming out from the 3.5 jack.

pi@zpi:~ $ speaker-test -D hifiberry -c 2

speaker-test 1.1.3

Playback device is hifiberry
Stream parameters are 48000Hz, S16_LE, 2 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 128 to 131072
Period size range from 64 to 65536
Using max buffer size 131072
Periods = 4
was set period_size = 32768
was set buffer_size = 131072
 0 - Front Left
 1 - Front Right
Time per period = 2.754709
 0 - Front Left
 1 - Front Right
Time per period = 5.461233
 0 - Front Left
 1 - Front Right
Time per period = 5.461254
 0 - Front Left
 1 - Front Right
Time per period = 28.336253
 0 - Front Left
 1 - Front Right