Problem with DVD player screen output

Question

My DVD player works fine if connected to the TV using the AV out cable. If I play the player to view the picture on the TFT display, the screen appears blurred out. Nothing is recognisable on the display. Even when no disc is loaded, the screen doesn't display the default screen correctly. Is there some way to reset the TFT screen on the player? There are no problems with the sound output.