SOURCE: No valid disc
the codes might have got switched somehow (region codes.) go to this site www.videohelp.com/dvdhacks.php follow the instructions.....I hope this helps!!!!
SOURCE: DVD player reads open and the when I push the play button it reads invalid key
I am having the same issue with Toshiba SD-P1850
SOURCE: PORTABLE DVD PLAYER NOT SPINNING DISCS AND SAYING NO DISC
When it is region lock it will say it on the display, if the player is not reading any disk, it is more likely a lens problem, see below:
Try first using a lens cleaner disk, like the ones here.
If
that does not work, the unit must be disassembled, and lense cleaned
with q tips and isopropyl alcohol or cleaning solution. See below:
How to Clean the Laser Pickup Lens on your DVD Player
How to safely clean a DVD lens?
Clean DVD lens, or replace player?
Clean CD or DVD ROM lens with a brush?
Cleaning your DVD drive
How to clean a DVD player
How do I clean my DVD player optical lens isoproponol alcohol
SOURCE: Disc tray keeps opening/closing on DVD recorder
my dvd player sony cinema entertainment system dav-dz111 the tray is opening again after closing
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