Dreamcast video output problem.

[Ergot]

I have a Dreamcast that is displaying incorrectly (see photos). The photos show the image via RGB scart, I have tested it with a composite cable and get no image.It works fine via my VGA cable, so I am thinking it is an issue with composite video and composite sync as the VGA uses the separate horizontal and vertical sync signals.

 

[citrus3000psi]

Looks like its somehow being stuck in VGA mode? Would explain why composite doesn't work and why RGB is showing doubled pixel data.

 

[Ergot]

I didn't look at it that way (duh). So VGA select (pin 6) on the AV out socket is somehow always connected to ground even when another output cable is used?

 

[citrus3000psi]

Yeah, I would pop open the case and probe with a multimeter.

 

[Ergot]

The VGA select pin isn't connected to ground, unless the grounding happens when the console is receiving power?

 

[Ergot]

This again.