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Bad video over composite


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So I have a Dreamcast that was dropped or hit or something. I bought it as parts but it needed a new power supply. After that it powered and worked fine over VGA on a flat screen. Come time to play it on crt, I only had a composite cable. It had crap video, almost like it was scrolling. I took it apart and thought to check everything inside. I didn't see anything out of the ordinary. Nothing burned up, no broken solder that I could see. Continuity between all contacts on the video output.


So I ordered an svideo cable and it works fine over svideo. Different cable still won't support composite. Also, I tried both cables on a different console with the same result. Image attached.


Is there a composite video amp or chip that's separate from s video or VGA?


Any advice is appreciated.


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