I've added more related information in the previous post, as the link to the 5v schematic.

Your motherboard is just a regular board, so all the dm800hd schematics should be usable.

I have some doubts about the cap you have used, it has nothing to do with your issue but it may give scart problems.
Better is to use a cap with a lower loading voltage than the 50v you now use.
Same value as the others.
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Johnny B.

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