Question about Sanyo DWM400 DVD Player

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My dvm400 says no discs. I have cleaned the laser lens and still does not recognize the disc. Can you help?

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Try cd for music, if that works there is hope to get the circuits hot enough to drive out the moisture on the semiconductors. Otherwise try using a fan to blow on the dvd player(more than 2 hours) to dry it out. Then try cd, then try dvd?

Posted on Oct 15, 2010


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  • Check the disc you're using for scratches and dirt. If the disc is damaged it won't play properly, regardless of the CD player's ability to function. You can use a CD repair device like the "Disc Doctor" to repair the CD or purchase a new CD.

  • Clean the laser lens with a CD laser lens cleaning disc. CD laser lens cleaning discs can be purchased at most electronics retailers or online. Insert the laser lens cleaning disc and follow the instructions.

  • Insert a correctly-formatted, undamaged disc into your player. Listen to see if it begins to read the disc. If it continues to make no sound and gives you the same message, then the problem is probably that your disc is not spinning in the device.

  • Clean the lens while the DVD player is open. A dirty lens is most likely the cause of your no-disc error. The lens should be cleaned with isopropyl alcohol and a cotton swab.

  • Dec 11, 2010 | Sony CMT-EP505 CD Shelf System

    1 Answer

    My XO Vision DVD player in my car headrests stopped reading discs. It says no disc even when one is in the unit. Tried to clean it with a cleaning disc and it didn't help.

    This sounds like a laser problem. The laser is not recognizing that a disc is in the unit. The cleaner unfortunately is only for the lens

    Nov 17, 2010 | XO Vision XOD1735 Car DVD Player

    1 Answer

    My panasonic sa-mt1 says that there is no dvd in the tray, it says no dvd?.

    There a few common reasons why dvd players will not recognize the disk.

    1. If the disc to really dirty or scratched the optical reader will not be able to read it.

    2. The optical lens could be dirty and will need to be cleaned. If the laser can not see (so to speak) the disc and read the tracks it will not recognize the disc.


    3. If the spindle motor does not spin the disc, the optical lens will not read the disc and not recognize it.


    4. If there is a malfunction with the optical reader assembly (the laser malfunctions) it will not read the discs. The whole optical assembly is the entire optical lens and circuit board seen in the above picture along with a few other components not seen.

    5. The disc tray could be out of alignment. This usually does not happen unless the device has been treated roughly or dropped.


    In most cases, a simple cleaning of the discs and the optical lens will solve the problem. If the disc is not spinning, the spindle motor has malfunctioned and it will need to be replace which with parts and labor will cost you roughly between $70-90 dollars (most is labor) depending on the prices in your area that service technicians charge. The most expensive part to replace is the whole optical assembly, which depending on how much you paid for the device, it might be cheaper to buy a new player (average estimated cost of replacement between $ 200-280 most of which is the part unless you can find a great deal some where).

    Check to see if your discs are scratched or dirty by holding them up to the light and tilting them back and forth. Try new disc in your machine to see if the problem still persists, if it does then try cleaning the optical lens. You can purchase cleaning discs to do this for you or you can do it manually. You can also purchase things that will help clean your discs as well. For a more detailed description of cleaning procedures, please review my profile where you will find my tips. Check to make sure the discs are spinning. You can remove the cover if you like or you can listen really close to hear if the discs are spinning up. If the discs start and stop the entire process without spinning up after you have cleaned the discs and lens, the problem could be that the spindle motor is about to go out. If the discs are not seated in the tray properly or the tray itself if out of alignment then it could cause the machine to not read the disc properly.

    I hope this helps you solve or determine what the device malfunction is. Please let me know if you need further assistance.

    If you would not mind, please rate my help. I would greatly appreciate it. Thank you.

    Feb 05, 2010 | Panasonic Televison & Video

    2 Answers

    I have a techwood st67 3-disc changer that doesn't always recognize a cd much less actually read it... any ideas?

    The laser diodes2.gifwhich read the disc weaken over time and the lens can become dirty.Remove the case and you will see the 4mm dia. lens on the assembly riseup to read the disc when inserted. Eject the disc and lightly wipe thelens clean with a cellulose acetate Q tip or head cleaning cloth withjust a small amount of disc/optic/lens cleaner. Try playing the disc. Ifit will not read any discs then the laser diodes are to weak to read orthere is a malfunction in the digital signal processing2.gif board. Unless it is under warranty, you will need another unit.

    Jul 19, 2009 | Electronics - Others

    1 Answer

    Portable dvd player does not recognize disc. spins and stops and says no disc

    clean the laser lens if this don´t solve the problem change the flat cable who connects the main board with the laser lens

    Oct 02, 2008 | Televison & Video

    1 Answer

    Dvd stuck on the reading part

    Sometimes the problem is CD DISC, Next Is the laser lens, cleaned the lens with 100% cotton buds.. or if not working after you cleaned the lens, replace the laser eye A new one!

    Sep 14, 2007 | Toshiba MD13P3 13 in. TV/DVD Combo

    2 Answers

    3 yr Old CD Player not recognizing discs

    Laser might not be faulty but just a dirty lens/ rail assembly.
    If thou darest open the thing, clean the lens ( GENTLY) with a swab of glass lens cleaner. Clean the chrome runners for the optics assby with a swab lcaed with WD40 or silicone.

    Aug 01, 2007 | Yamaha CDC-565 5-Disc CD Changer

    4 Answers

    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 :)

    Jan 30, 2007 | Venturer PVS177W Portable DVD Player

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