Hello Alexey,
I also have an LG TV connected, a C9 55″, to a BS3 (mk3).
I use a super simple optical (toslink) to coax converter. All works fine, feeding 6 Beolabs through Powerlink.
Do you have Powerlink to RCA cables for the Beolab 8000s then? And you say that the Beolabs show orange leds? Orange leds are not usual and indicate an issue – they should be red (off) or green (on). Do you have Beolabs that work with Powerlink to try? Could it be that the volume coming from the BS3 is too low to trigger the RCA fed Beolabs?
There are some more threads around this, including screenshots of the LG sound output options and the BS3 input options, such as this one: https://archivedforum2.beoworld.org/forums/p/43717/316931.aspx, hope they help to isolate and fix the issue.
Regards,
Johan
