Installed pHAT DAC using the simple setup approach. Press-on only at the moment - wanted to check all OK before soldering.
Have run two tests:
shows snd_soc_hifiberry_dac and snd_soc_bcm2835_i2s
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dac], device 0: HifiBerry DAC HiFi pcm5102a-hifi-0 
Subdevice #0: subdevice #0
Have tried various sound test approaches, but nothing emerges. (Power speaker connected over 3.5mm jack to line out).
As far as I can see, I’ve done everything correctly - the modules are all in place etc. The only thing I haven’t done is the soldering. Surely that can’t be it?