Hardware debugging

I bought a hifiberry dac recently and started setting it up with a pi.

Now I am at a point where my pi + hifiberry passes all the tests in the faq*, but unfortunately I get no sound out of it :(

I am looking for suggestions. What I find is:

1 - There are no visible defects in my soldering;
2 - There is continuity between pins on the two boards wherever common sense says there should be;
3 - There is one case where two adjacent pins have continuity, which could indicate a short, but I can't see anything wrong and this may be by design (is it?)

*On the software side, "aplay -l" does show the right output, and aplay will run without error on a wav file. The pi's on board audio produces sound in this case, but the hifiberry does not produce sound.

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