RGB requires an additional signal for synchronizing the video display. Several methods are used:
composite sync, where the horizontal and vertical signals are mixed together on a separate wire (the S in RGBS)
separate sync, where the horizontal and vertical are each on their own wire (the H and V in RGBHV)
sync on green, where a composite sync signal is overlaid on the green wire (SoG or RGsB).
Composite sync is common in the European SCART connection scheme (using pin 17 [gnd] and 19 [out] or 20 [in]). Sometimes a full composite video signal may also serve as the sync signal, though often computer monitors will be unable to handle the extra video data. A full composite sync video signal requires four wires – red, green, blue, sync. If separate cables are used, the sync cable is usually colored white (or yellow, as is the standard for composite video).
Är rätt säker på att du inte kan köra in komponent video i ett scartuttag som är gjort för RGB. Du behöver synken också.