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I have JDS Labs built ODAC and it served me fine till it has developed some static-like noise when being plugged by USB. I've tested it on different PCs with different cables and headphones and problem seems to be in ODAC itself. Took it apart and cleaned it, though it had little to no dust inside due to enclosure.

 

Can anyone give me some tips on how to diagnose and fix the problem? Some electric component went bad and needs replacing? Many thanks in advance.