Several days ago, I bought a car DVD player online.After I set up the DVD player on my car.I have tried to use. There is no sound with some DVD disc, but some DVD disc can work. Anyone can tell me why? Is it the problem of my car DVD Player? Or is it the problem of my disc?

 

Most like the DVD player. Check which audio mode it's using when you play the ones that work vs the ones that don't. See if it's using the stereo track on the ones that work, and maybe Dolby Digital on the ones that don't or something along those lines. It honestly *shouldn't* matter, but I have no clue what DVD player you have or how it's setup.