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Did you check if the DVD disk you are trying to play is actually playable? Mabe the player can't read the disk so reboots to radio. Also, you should try with another DVD disk
If disk is ok, recheck your original setup options, but I'm quite sure that it's some electronic failure of your device. Simply should not make sense some hidden option to play radio wnen you select the DVD player.
So your final optin probably should de take your device to repair service. Look at your original warranty for nearest authorized repair service, even if warranty has expired.
you must have connected the safety feature to the hand brake. this disconnects the dvd from working until the hand brake is applied. you will need to attatch this wire to a ground connection to enable it to be played while moving
This would denote some kind of vertical sync problem. I would begin by checking the vert sync circuitry. To do this you will have to have an Oscilloscope, and DVD containing a steady-state picture. The oscilloscope is used to measure the vertical sync rate and the vertical sync pulses. Taking into mind that ther is a video signal present but it is in the black range. If you do not have an oscilloscope it makes troubleshooting this hard. in any event you will also need a schematic to see what waveforms you should be seeing.
If you do not have a background in electronics you may have to have someone who does look at this unit.