Good call. I hooked the Oppo directly to my amp (L, C & R) and got sound so it's pointing at the 975.

The OSD and all the digital stuff appears to work. The factory reset did not fix the issue. The 12 volt out is turning the amp on so I'm thinking it's the analog output power supply that died.

I'll play a little more tonight and figure out what to do from there.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2