The power supply was replaced and the unit is up and running again. We also got to test the digital out board in the Rio. We got sound, but it was quite garbled and L/R was all out of whack. Are you sure the signals going to U11 are in I2S format and not something else like left or right justified? That would require some modification to the board to get the CS8405 running in those formats, but can be done of course. Later, I'll try our original prototype board with jumpers that lets us change formats and see what happens.

Stu