i think you neeed a new pair of cables. Good luck.
No this not the problem, I already gave the solution:
The DVD remote has a video button.
1. The DVD player must be empty of DVD/Disk.
2. On the TV set select yPbPr option view mode.
3. On DVD remote, click several time on video button until the image shows YPbPr selection from the DVD , then the screen should correctly display. ( this way you will control which output is chosen among the available ones: SCART, Composit, HDMI, component...).