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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.
The VCR is connected throug an audio/video cable (red, white and yellow) This happen because the electronic ciruitry on the combo "read" that the signal is going out to copy, and this devices have a copyraigh protection circuitry tat don't allow to do this, is not your fault, but making the connections like this, the systems automaticly activate this feature. If you can change the tv with one taht at least have the white and yellow RCA terminals, your problem will be solved definitevily.
Your cables are coded red(right audio), white(left audio) and yellow(video). The cable inputs on the dvd player and tv are likewise coded. Just connect color to like color. In setup, do not
change NTSC! If you should go to PAL you'll never get out of setup and all you'll have is screen roll, as though the vertical hold gave out.