All DVD players will have have cables in the back that will also be plugged into the tv
1 is a power cord to wall
The others are for audio and video there are 3 types or ways to wire a DVD player
it will be a coax cable that i wide and stiff & the connector screws on, that is for video, and it will require 2 other cords that are red & white for audio. They just push in
you have a set of 5 cables that are colored green blue yellow for video red white. For audio these just push in
you will have an HDMI that is one cord with a wide connector that will push in
if you can see the back of the tv you can follow the cable from the DVD player to the back of the tv and the tv will have a label very near the connector indicating which input the DVD player is on.
If you cannot see the back of the tv; you will have to check to make sure your cables are securely plugged in.
turn off the dish network device
Turn on the DVD player and wait about 20 seconds, press play this way there is a signal or picture going to one of the inputs.
turn on the tv, "smart tv's" will know that a signal is coming in and they Adjust to the input that is sending a signal. If yours does not do that
press input wait 20 seconds each time you press it until you see a picture from the dvd.
if that doesn't work the your problem is the cables
if your press input and the tv screen says dvd; but your cables are plugged into another input like AUX or game, then you have to chose AUX or Game on the screen to view the dvd.
please reply to the comments if you are successful or have more information and I can help you resolve this issue,