There's some increasing interest in adding RGB support to CD-i players, to boost the video output quality. Special interest goes to the CD-i 470 and 490 players, as these normally only have RCA support but the mainboard has space available to add RGB components: CD-i tweakers like Retrostuff and Mobius are doing their best to create mods for these CD-i families. Retrostuff: "It's time for a quick work in progress picture: This is a CDI490 with added components for RGB, composite sync and audio via SCART. The switch and blanking signals are not there yet. Let's assume to add Euro-SCART RGB. If you want something else, like YUV, then this is not going to work. For a start, always follow the footnotes in the service manual:
# - Only for RBG - add 1k resistor 3161 to enable RGB (it's right next to the Bt video encoder)
@ - Only for CDI210/51... do not add these components, they are for Jp region only
**
** - Not for player with Eurocon - do not add these components if you want to implement RGB/SCART (1013)
Follow 2,4,6,8 through the unpopulated area on your player PCB (marked "analog video") and add components for each colour and sync until you reach the SCART connector (1013) and its pins 19,15,11,7.
Ignore the components in the boxes with the dashed lines (explained above). You will need a transistor and a couple of resistors per signal. At the end, before the SCART connector, there are a couple of coils (DSS306-xxxxx) - I don't know how to obtain these though.
Also, take care of SCART pins 18,15,11,7 (GND for the signals) and 16 (needs to be 1-3V to switch TV to RGB - just follow the schematics or omit if TV can be set to RGB manually). And don't forget the audio channels... There are already a bunch of 75 Ohm resistors on the way. The coils are EMI suppression filters, all ports of the CD-i players have them. It won't hurt if you leave them out for your initial tests."
[Thanks, Retrostuff]