Ultra Optical Input Issue

[Dennis from Venice]

I am streaming Apple Airplay to my Ultra optical in via a Raspberry Pi with Ropiee and a hat for digital coax audio out- t I also have a coax to spdif optical converter since the Ultra doesn't have a coax input.

It worked fine for months and just stopped. Now I can't figure out which component is bad (Ultra, Hat, Converter). Any suggestions ?? The red laser light is on and all connections seem tight.

 

[Krabin]

Have you outputed the pi to another DAC to rule it out and inputed another source into the WIIM to rule it out?