VCR shows tape is playing, but no picture or sound.
First, you need to check if the cables are properly connected to the television. Then you also check if you have your television on the appropriate channel that is to work with the DVD player/VCR combo for instance the AV channel. Then you can further try to change the cord used in connecting the DVD player to the television, if it does the same, then the problem is most likely from either the DVD's Audio Video port or from the Televisions Audio video port.
Have them both checked to detect which is faulty, and replace with the same type of port where fault is detected.
Take care and good luck