Here is what I found from the Venturer website: http://www.1800customersupport.com/
I hope it will help someone.
Q: I have an error message "No Valid Disk".
This indicates that the DVD Player has recognized that a disk is present but is unable to read that particular disk format. Insert a known playable DVD or Music CD. If these operate normally then the disk is probably faulty. If the known disk does not play, clean the DVD Laser lens as detailed elsewhere in these FAQs and try again.
Q: How do I clean the DVD lens?
Occasionally the DVD Lens can become tarnished due to atmospheric pollution or humidity. This reduces the ability of the laser to focus on the Disk and is consequently unable to read the disk data. The DVD Lens is situated in the DVD compartment and can be recognized as the small blue glass lens on the moveable laser platform. Using a Q-tip soaked in CD Cleaning Fluid, gently clean the lens. Leave the lens for 30 minutes to dry thoroughly before loading a disk to check the operation of the player.
Q: The disc does not play.
There is no disc inside ("No Disc" appears on the LCD). Insert the disc correctly with the playback side down on the disc tray. Wipe the disc clean. A non-NTSC or PAL disc has been inserted. The unit and region numbers are incompatible. Press the TV MODE on the remote control to output the video signal to a TV. Condensation may have formed inside the unit due to a sudden change in temperature. Wait about an hour for it to clear and try again.
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Re: DVD not playing
Here is the link to the user manual, troubleshooting and venturer support contact details;
Hope this helps, please post again if not :)
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some players won't play burnt discs. If you are using a factory made disc and you still get this, then you can try and clean laser lens with rubbing alcohol and cotton swab. If the cleaning doesn't work, then the laser lens circuit will need to be replaced.
If the lens is clean (clean with cotton swab and alcohol), then the optics are failing. DVDs require more power and accuracy to be read than CDs. The ability to read CDs but not DVDs is usually a good indication that the optics are starting to fail.
Get a laser cleaning disk, and follow through with the instructions about how to clean the laser with it.
If you are able to remove the DVD player drive, you can manualy clean the laser.
If cleaning the laser does not fix the fault, then this means that there is a failure somewhere else in the drive, or the laser itself is defective. Most of the time, these drive's are not worth servicing.
My Smasung DVD/VCR Combo stopped reading DVDs because of a dirty read head. It started by only playing disks sometimes, and progressed to never playing disks. I assumed it was a dirty laser lens so I bought a lens cleaner set. Unfortunately my player wouldn't play the cleaner disk.
So I took it apart and cleaned the laser lens manually with some isopropyl alcohol (the clenser that came with my cleaning disk), and a lens cloth (that came with my glasses). Just open the case (starting with the screws in the back) and remove the snap in cross panel that obscures the lens of the DVD portion. Put a drop of cleanser on the lens and gently wipe it with the cloth.
Oh and by the way, I take no responsibility if you break your own player while following my instructions. My own DVD player was far out of warranty at the time I cracked it open.
Try using 8x and lower DVDs and -R ones; try cleaning with CD cleaning disk and then try recording a few min again.
If that doesn't help try unplugging and waiting about 30min then put in disk that was previously recorded and go to last item and play it to end (if 2hr long skip to last skip and then play until it finishes) - now try just recording a few min using the manual DVD record button and see if error comes up again - usually this unplugging somehow resets everything. Hope this helps ya'll.