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VCRs (if playing tape) would be the least recommended signal source for troubleshooting...Especially sync troubleshooting.
VCRs record the complete signal on tape and play it back...As such the most minute lack of precision in the mechanical systems results in sync errors in the VCRs output. Sets made before 1970 were not made with VCRs in mind and will have a harder time correctly syncing to tape than say an 80's TV set, but even the newer sets will show some errors if the signal is bad enough.
Use a DVD player, OTA DTV/cable/sat converter or test pattern generator for troubleshooting.
If your DVD player lacks RF output then you can plug it's A/V output into the VCRs A/V input, tune the VCR to it's A/V input and use the VCR to RF modulate the DVD signal. The VCR should not cause sync issues as long as you do not use it to play videotape.
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