26-12-2020, 05:47 PM
It seems that I had a DIY kit. Removing the RGB+I-to-Analogue adaptor board I immediately noticed some dodgy soldering by, ahem, me.
Pin 9 of U2 (MAX4619 analogue multiplexer) was unsoldered, and the middle pin of the 7805 (ground) looked dodgy too (although the chips seemed to be powered okay).
Pin 9 of U2 (MAX4619 analogue multiplexer) was unsoldered, and the middle pin of the 7805 (ground) looked dodgy too (although the chips seemed to be powered okay).