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MC1377 RGB to composite encoder help

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neazoi

neazoi

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Hello, I have build this little RGB to composite encoder, to drive a TV from a microcontroller project that outputs RGB and HSync signals
https://www.retroisle.com/amstrad/cpc/Technical/images/encoder.gif
The circuit seems to work but only a black and white image appears on the LCD TV.
Any ideas of what could the problem be?
 

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