Normally with component video the sync. is combined with the Y. Did you already try feeding in component video ignoring the expectation of separate sync.? Some projectors with a separate sync. input may still accept sync. via the Y.
If that did not work you might try using a Y-connector and sending the Y feed to both the Y input and the sync. input. If the sync. input ignores the positive going content (the video) it will pick up just the sync. and it may work OK.
A forum community dedicated to home theater owners and enthusiasts. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIY’s, product reviews, accessories, classifieds, and more!