DAC stopped playing

Hi,

I've got a problem with my DAC, M2Tech Young DSD, it just stopped playing today. It powers on, computer sees it without a problem, it can output to the DAC, and the DAC shows correct sampling frequence, but there's no sound there at all, total quiet.

I tried USB and Optical inputs, tried changing cables, but nothing helped.

Any idea what could be the reason? Are DACs repairable nowadays or only replaceable?

Thanks!