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Found that solution mate, and yes, it works perfectly well. However I really don't want to have to turn the TV on while plying a CD. The problem is not there during DVD or BR playback, no sticking discs causing picture and/or sound issues, all perfectly good.I raised this back in 2018 on the US forum (when I had a Sony TV) and the only solution then was to turn on the TV and use Display off if you don't want it on for long periods.
Official OPPO UDP-203 Owner's Thread
Maybe it is possible to turn off HDMI CEC (Bravia something?) and / or ARC on new Sony's?