BeoVision 1 (from 2000s)

Hello and greetings,

I own an old (from 2000 I think) B&O TV, namely the BeoVision 1, I think type 4186 (short floor stand). Now I bought an adapter which transforms the HDMI input from my laptop and changes the output to SCART. Works like a charm. The only problem is, I don't get audio from it. I actually tried connecting separately the R-L Cinch from the laptop to tv (at the same time as SCART). The TV doesn't somehow register it. My question to you is, would the SCART cable, which has a Cinch audio cable coming out from one end, work when of course connected as SCART in the back and in the front on R-L phono? I repeat it's a one cable with sort of three ends.