I wanted to post an update that the problem is solved.
I got myself a multimeter and measured the VGA cables. Even though I had been told they were fully wired, there was no voltage on pin 9.
I eventually purchased a cable from a seller who provided a proper wiring diagram, so I could be sure that it was truly fully wired.
Everything works now.
Thanks everyone for your help!
Thanks for your replies. I’m sure that the SCART cables I tested are true RGB SCART cables.
Regarding the VGA cables, as I mentioned I unfortunatwly can’t do voltage measurements myself, but the sellers told me they were fully wired. The two VGA cables I’ve tried are:
HAMA 00200707
799422539334 (from Amazon)
If those are incompatible,
I’d appreciate any specific recommendations for a known compatible VGA cable that carries ddc5V.

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