Help needed with A4000 video output problem

[Lomax]

I have recently rescued an A4000 with a 40Mhz Warp Engine from being scrapped(!) and am quite excited to get a chance to experience some AmigaOS goodness. Sadly, however, there seems to be a problem with the video output. After getting a Amiga -> Scart cable and hooking it up to a TV I was disappointed to see this boot screen (Photoshop mock-up):



Where as it should of course look something like this:



Does this look familiar to anyone? Any suggestions what could be the problem? I do not know if the cable is at fault here, bought it second hand on eBay (listed as A1200 Scart cable), could it be that I have the wrong cable?

Grateful for any suggestions!

Lomax

[Lomax]

Thanks for all your suggestions! That the video card would be half dead seems (with my limited knowledge of electronics) unlikely. I'm gonna go with the assumption that my (cheap and old) TV doesn't handle RGB input properly and see if I can find another TV to test the Amiga on.

I think the Scart standard includes a composite video signal and that some devices only incorporate this interface, allthough they may have a standard Scart connector. I guess it's possible that the sync sent from the Amiga could be enough to generate the "ghost" image I'm seeing.

I'm not ready to give up on this machine yet as I'm much too keen to experience the legendary AmigaOS in all its glory!

Many thanks,

Lomax