If it's new then it could be hooked up wrong. If it isn't new then you could have done what I did by mistake and hit the "mute" button on your controls. Look for the mute button and click it. Hopefully this is all that's wrong.
If it's old...that could be the problem. My CyberHome DVD player, after lots of service, sometimes would play DVD 's without the sound . Usually after resetting (turned off, and maybe unplugged) it would play sound again, for a while.
You could also try this:
For a CyberHome DVD player that plays no sound when watching DVD's, another option that worked for me without resetting it or shutting it off was to place a music CD in the player. Once it played the music CD with sound, eject it and put the DVD back in. Works without fail unless the sound is really messed up.
the battery is dead
A DVD player does not have surround sound built into it. You can purchase surround sound speakers and connect them to the DVD player. This will make your movie experience much better.
The best brands of DVD players to use for a DVD player surround sound system will be brands listed as a home theater DVD player. The home theater DVD player is specifically designed to make the most of the surround sound system.
There are three main componets: the dvd player, the car video monitor, and the sound system. You need to mount the dvd player to either the dashboard or roof and run several wires from the audio of the dvd player to the speakers of the car.
Try changing the source on the television to AV1 if you only have sound but no picture from a DVD player. If it is on TV it will not play a DVD.
it should automatically have sound
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Most Ford Expedition DVD players use wireless headphones for the sound from the DVD player. They are usually stored in the seat back pouches in the driver and passenger seats. If you don't have the headphones you will have to get them from the manufacturer of the DVD player. Hope this helps.
It is possible to wire a DVD player just for the picture, and not for sound, although most people prefer to have sound. Dialogue can be very interesting.
If you have hooked up your DVD player and get sound but no picture, try changing the picture source from TV to AV 1.
I am not completely sure if the set up for DVD player surround sound hard to do. I have done some research and found videos and guides that might help you about it.
If your surround sound is only playing through the DVD player and not the TV, it may be due to incorrect audio output settings. Check that the DVD player's audio output is set to send the signal to your surround sound system. Additionally, ensure that your TV's audio output settings are configured correctly, and verify that the surround sound system is properly connected to the TV. Lastly, ensure that the DVD player's connection to the surround sound system is functioning correctly.