Question about Sony DAV-C900 System

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Does not recognize/play DVD - shows "NO DISK"

It will still play CD but when I try a DVD (that has worked before) it will make sounds like it is starting to read but then you can hear head seeking and then it reports "NO DISK" on the display and the TV will show "Insert Disk".
If a CD is in one of the other slots, it will start playing the CD instead of the DVD that was inserted.

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  • raustinort Dec 02, 2008

    I fear trying this because I do not possess the knowledge/tools to accomplish.  I don't know if you missed the point that the unit still plays CDs as it always has.  It is the DVDs that are not recognized.

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If you are good at repairs.dismantle the Disk drive unit carefully from the main carriage and if the Optical lens reading unit has got a drive P C B ,then desolder the PCB so that you have only the CD mechanism on your table,with a Digital Multimeter check the Ohmic values of both the Spindle motor and Sled motor. the resistance should read between 4.5 ohms and 8ohms any value beyond this means that the drive signal voltage is not enough to move /rotate the disc and optical-pickup in syncronisation.you can get the drive-motors replaced,or replace the CDM assly available off the shelf.
this should solve the problem.hundreds SONY DVD players are running with this remedy.

Posted on Dec 02, 2008

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Sony DAV-C900 Home Theater System: problems with speakers and dvd picture quality Hello all, I hope someone can help me here... The speakers have been going off and on intermittently for a while now. I have cleaned the connections, but it does no good. Sony has these stupid color coded connectors and I do not know how to go about upgrading the wires. If that is even the problem. I have switched the wires around, and when I switch one that works to a non-working connector it will not work. When I put a non-working speaker wire into one of the working connectors, it will work--it almost seems to me that it is either a problem internally, or with that specific connector that sticks out of the rear of the unit. After fooling around with them for a while, I can usually get it to work, but then it will go out for no apparent reason. Another problem has to do with the picture. It has developed these squiggly lines while watching dvd's. Sometimes they go away after a while, but it is certainly annoying. I have attempted to clean the laser with one of those dvd cleaning disc's and even replaced the s-video cable, but neither has resolved this problem. It used to have an excellent picture, even though I wasn't using component cables. Due to my TV set-up, I need to use the S-video hook-up, but like I said it has always worked well until recently... We really do not watch that many movies, so I wouldn't think the laser is going bad--hell, the kids have many more hours on their xbox than this unit has...If I had the money, I would just go out buy a new system--not an HTIB this time, but this year has not been too lucrative, so I am stuck with this for the time. Any help will be greatly appreciated. Thanks Dana

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