We have a 23" Toshiba with a internal DVD player.

No,tv internal DVD player are not on sale by itself as a seperate unit,only can buy it from the tv corporations themselves and it not cheap and have to have experience to putting it in into the tv internal tv itself.The tv internal DVD player now,could be the laser eye data reader have problems reading mp3 and mp4 files on the DVD disc,which are video files.Now tries to play more than one DVD movies dic,tries like to play like 5 to 6 original DVD movies.One disc don't play tries another DVD disc.Tries this might forcing the laser eye reader to read DVD dics again and than might fix it to read video files again.Or just buy an external DVD player hook it up to the tv and play DVD disc on to the tv video modes.DVD players external devices are really cheap these day,like can buy new one for $40.