There is no difference between YUV and Y,Pb/Cb,
Pr/Cr or sometimes just Y,Cb,Cr.
They all mean component video.
In YUV:
Y carries the luminance and sync
U carries colour difference-blue minus Y
V carries colour difference-red minus Y
make sure your device is definitely outputting RGB. Most DVD players and set top boxes will output RGB via the scart but check in the menu that it is set to RGB.