GX4000 Jail bars or PSU issue?

[nam9]

Hi,


I have recently set up my GX4000 with Geralds C4CPC, a new 9v 850ma PSU and a ridiculously over-engineered Monster scart cable I picked up from a charity shop...


Well, everything boots fine, but the picture I am getting over scart has prominent vertical bars over the entire image.
Are GXs susceptible to jailbars on scart? (FYI I have a european model without RF, just Scart/Din).


I have tried 2 different 9v power adaptors... could this be a power related issue?
Pic attached... not easy to see, but very clear in person

[nam9]

So short answer, yes, Jailbars are an issue (unless someone wishes to suggest otherwise?).


From https://circuit-board.de/forum/index.php/Thread/15426-Amstrad-GX-4000-Bildverbesserungs-Mod/



Same thing I see...





That link brings me to ArcadeTVs work on GX4000 video imaging, which is in a post here on CPC:


http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/gx4000-video-processing-questions/


ArcadeTV concluded that the jailbars may be a result of interference from a clock line in the DAC.


Some great examples of what could be... but some issues left to iron out it seems...