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Old 5th February 2010, 08:25 PM   #1
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Default black and white output from s-video connection

Hi i'm trying to hook up a tv to a computer through the s-video out on the graphics card to a svideo to composite video cable to a tv.
The output comes in black and white....

I've read somewhere you can get an adaptor that changes or decouples a dc offset to remedy this problem. IE, a certain dc offset causes the tv to switch into black-and-white mode. Any ideas?
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Old 5th February 2010, 10:17 PM   #2
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How are you combining the Y and C lines? Just shorting them together? You may need a bit of resistance to effectively mix the signals like 75-Ohm in series with each of Y and C before combining them. A small capacitor in series with the C line will remove any DC offset, say 0.1uF ought to work fine.
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Old 5th February 2010, 10:29 PM   #3
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Well, get this. I just checked it with a multimeter.

Luminance is connected directly to the output.
Chrominance is not connected at all, and i checked the capacitance to see if the capacitor was in there! Nothing!!!

Moral of this story, don't trust crappy crappy adaptors.
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