Vcr no picture but has sound?

I have a jvc vcr with no remote and a vizio tv with remote from comcast. I cannot change channel on tv but vcr has a channel up and down. It's hooked up to composite on tv. Ok that being said I can explain the issue. We can watch one movie as long as we don't stop it and then some time later we can watch... show more I have a jvc vcr with no remote and a vizio tv with remote from comcast. I cannot change channel on tv but vcr has a channel up and down. It's hooked up to composite on tv. Ok that being said I can explain the issue. We can watch one movie as long as we don't stop it and then some time later we can watch another movie. I stopped the movie to rewind it and again I have only sound without picture. What can I do to fix this? Could it be a dirty head or tracking or something else? Whatever it is can you tell me what I need to do to fix it?
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