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There should be a preset resistor on circuit board of old CRT based TVs, designated as vertical rolling adjust. Try to locate it and adjust a little till rolling stops, while playing the DVD. The set will be live during this process, so be careful. If you are not familiar with electronics, do not
attempt to repair. Whether you suffer fatal electrical shock. Instead, contact any experienced service
technician, or the nearest service center.
You switched to PAL mode from NTSC or vice versa. Most DVDs will only output PAL or NTSC, not both. So even if the disc is region ffree, the fact that it's encoded in PAL (50hz) makes it appear like you describe - no vertical hold / black and white.
Some set top players [Apex, Phillips] will convert PAL to NTSC on the fly or vice versa.
it really doesnt matter what color the cables are as long as the one from video out on the dvd player is going to video in on the tv then the same for the sound.yellow is generally video and red would be your sound