I just bought a Sylvania Dvd player and my remote stopped working. It still plays movies with the buttons on the actual player but any button on the remote just gives me the message "Invalid key"

Simple time for a new player.

hi there.
go to this link and see if it helps you get it sorted.
How to Fix DVD Player When the Drawer Won Open Techwalla com .
or this one.
DVD tray will not eject the movie Google Search

Some brand name of the DVD player.Some brand name DVD player,u must used it own DVD player remote to turn on the volume higer or lower to get it up or lower on the movie DVD discs or any kind of DVD discs are playing.The tv dosen't control the output volume of the movie,if the function require the DVD player remote to do it.Check ur DVD player remote see if u have a volume control buttons + - used those buttons on the DVD remote control u will control the volume of the movie DVD disc it is playing on the DVD player.

with regard to using the remote control :

Make sure the batteries in the remote are working (they go in the back of the remote at the bottom).

Turn on the DVD player with the power button on the DP300 itself (lower left). Open the dvd tray either with the remote (press open/close button, upper right) or with the button on the DP300. Put a DVD in the tray and close it with the remote or the button on the DP300. The DVD should load.

Use the arrow buttons in the centre of the remote to select choices from the onscreen menu of the DVD. Press Play (centre of the 4 arrow buttons) to activate the choice you want. For example, if you want to play a movie, use the arrow buttons to go up or down until "play movie" is selected, then hit PLAY, and movie will play. If you want to choose a scene/chapter of the movie, use arrow buttons to go up or down until Scene Selection or Chapter is selected (highlighted), and press PLAY. This should bring up a list of the scenes or chapters. Use the arrow buttons to select the one you want, then hit PLAY, and that scene should play.

If the DVD tray is taking less than 20 seconds to operate, there is likely no problem. If it is taking more, there may be. I think the mechanism that opens and closes the tray is often the first thing to stop working on DVD and CD players.

You can probably use the front panel buttons (STOP PLAY OPEN/CLOSE etc) manually, the only thing you cannot do without the remote is access certain DVD menus, including subtitles/language/special features etc. You can always obtain and use a universal remote for basic menu functions later on if necessary.

To play a DVD movie without the remote, simply load your preferred disc, wait for the player to finish reading its contents, then to skip copyright warnings and/or the 'play movie' menu screen, press STOP, then PLAY, or simply press PLAY button where 'play movie' (or whatever function) is highlighted in the menu. These buttons should be on the front of the main unit. Doing this should encourage the player to detect the appropriate title (the movie) and play it (basic playback operation may not be possible with some DVD releases due to the numerous interactive menus and title pages, such as film trailers).

If basic manual operation is not completely possible with some DVD titles, consider a universal remote for your player if you have either lost your original, or the player was purchased/received without one. Such remotes are relatively inexpensive to purchase, and are available just about everywhere.

Press the top menu button on the remote after putting a multi movie DVD. Scroll down on the movie file you want to play and press enter. You will see two items in each of the movie folder, Scroll down on the second item and press enter.That is the movie folder. It will play.

After the movie loads and shows "play" highlighted. And only then,press the stop button and then press the play button and the movie should play...hope this helps.

try pressing stop while at the menu. then stop again. then hit play. that works for most dvd players

TRY PUSHING the ENTER BUTTON on remote TO START MOVIES THAT DONT ALLOW MOVIe to start when play button is pressed.

Sylvania SRD3900 remote codes