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LG DVD Recorder "Unknown disk error"

I have recently experienced a problem where my LG DR7800 DVD recorder will not recognise disks "unknown disk error". I'd had no problems until recently and I haven't changed anything. Any soloutions? I have an LG DR6621W DVD Recorder.
When inserting a disc it states "Unknown disc, please check disc again"
It still plays CDs, so I guess the laser alignment is OK.
I have changed the region setting to '0' all regions by using the 0000000 hack, but still no luck.
Can I upgrade the firmware, and how?

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  • 4 more comments 
  • sghshsdfhd Jul 26, 2008

    I have an LG DR6621W DVD Recorder.
    When inserting a disc it states "Unknown disc, please check disc again"
    It still plays CDs, so I guess the laser alignment is OK.
    I have changed the region setting to '0' all regions by using the 0000000 hack, but still no luck.
    Can I upgrade the firmware, and how?

  • sghshsdfhd Jul 26, 2008

    Sorry there seems to be a bit of confusion as my issue was attached to a previous posting.

    My model is the LG DR6621W.

    Thanks

  • sghshsdfhd Jul 27, 2008

    I tried the lens cleaner and hair dryer, but still the same. I don't think it is a hardware problem.
    Any other ideas?

  • sghshsdfhd Jul 27, 2008

    I guess if the lens was bad it wouldn't read CDs or DVDs, but it still reads CDs.
    I'm sure it's coding/firmware. How do I upgrade or reload it?
    Thanks

  • sghshsdfhd Jul 27, 2008

    Guys, everyone is telling me to clean the lens - I've done this many times.
    It's not a dirty lens as it reads CDs but not DVDs.

    How do I upgrade the firmware?

    Thanks

  • sghshsdfhd Jul 30, 2008

    Thanks for your feedback, but there is no screw for adjusting the lens. It is a suspended lens with lots of horizontal play.
    I'm 100% sure it is not hardware.
    Does anyone know how to upgrade or reload the firmware?
    Thanks

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Hi,

Big difference in reading CDs and DVDs or SVCDs. A CD has one spiraling track that's really easy to read and follow.

A DVD has cylinders and sectors. The mass of data per square inch is tremendous vs a CD and the lens arm needs to be very accurate. If it is damaged to the point where its sloppy in finding data in sector to sector tracking you will end up with your experience.

The trouble itself, appears similar to ones experienced by people with dirty lenses.

In your case this is clearly not true. You do state there is a lot of horizontal play. There shouldn't be any at all. Actually, when not reading a disc the arm should be locked.

I have to conclude you have a hardware malfunction and if you are under warranty I will support your cause to have your unit replaced.

Any of us can be found later at
http://www.fixya.com/users/worldvet

If you, and should be, fed up with the stream on non answers for your money you can just close out this thread and you'll be prompted to rate one of us to earn our share of your fee $6 or you can refuse and your charge will be credited back to you. You could also receive an email from fixya reminding you to rate this session and at that time you can invoke the money back gurantee.

Hope this answers your question and empowers you to move on and get your money back if you're unsatisfied.

Regards,
Worldvet

Posted on Aug 02, 2008

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As already suggested you have a dirty lens problem. But a lens cleaner disk and solution, like this one here : Memorex DVD Lens Cleaner, and use it a couple otf times, if it still does not work, you will have to take apart your device and clean using isopropyl alcohol and soft cotton straight on the surface of the lens.
Your firmware should be OK, or at least you need to do first lens cleaning to find out if there is any other problem.

Posted on Jul 31, 2008

  • Ginko
    Ginko Jul 31, 2008

    If it reads CD effectively it is unlikely to be lens error. In this case it is possible the machine read only +r or only -r. This happens often , even with DVD reader that are supposed to read both -r and +r.
    Buy two good brand (sony, memorex, verbatim, philips, tdk etc.) DVDs , one +R and one -R. It should work with either one, find out the kind of DVD accepted by your DVD and use only same kind.
    Do not use no brand dvds, some reader get in troubles with them.


  • Ginko
    Ginko Jul 31, 2008

    By the way, do not touch the lens, if you move the alignment you probably won't be a ble to do it again, and firmware is not the problem.
    Do the test I suggested and return us feedback.


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Make sure that you use suitable DVD's for your recorder.If you have created yourself ensure that they are closed after finished recording.

Posted on Jul 31, 2008

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:D firmware is sectret thing and all manufactures know how to protect it.

Posted on Jul 30, 2008

  • Shahid Electronics
    Shahid Electronics Aug 02, 2008

    Please take your LG unit to nearest LG Service Center before its too late :D

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  • 813 Answers

Your witer lanse has been week so u have to change the lanse of the writer

Posted on Jul 30, 2008

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If u have tried the cleaning procedure and found nothing in positive, then do a thing.
u have to allign it finally,
for this, open the main cover of ur dvd player and where the len exist, there is a small adjusting screw, a very small one. that is tuned for changing the intensity of lens, called lens allignment. cd has a different format as compare to dvd. the sense has to do a little bit different work for reading dvds. so make it possible to move that screw, in clockwise or anticlockwise. its a trick to do that because its very sensitive part.
regards,

Posted on Jul 27, 2008

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Get a Lens Cleaner from any Computer/Electronics Shoppe and Clean your DVD Player Lens as per directions enclosed with the DVD Lens Cleaner.
If this fails, you should contact Service Center as it would then be considered to be Hardware-related problem.

Posted on Jul 27, 2008

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2 things,

messed up the firmware (just the part that identifies movie disc)

or

lens gone bad (common problem with all optical devices)

Posted on Jul 27, 2008

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Click here for firmware;

www.videohelp.com/tools

Hope this may help;

Regards,

VOTIT

Posted on Jul 26, 2008

  • 2 more comments 
  • LORETO LACARON
    LORETO LACARON Jul 26, 2008

    I encounter like this before, can read CD but can't read DVD,this is the symptom DVD-ROM problem,only i do is open the DVD got a hair dryer reheat the circuit board avoiding the plastic connection and the to be direct hit.After its ok can read DVD,,,

  • LORETO LACARON
    LORETO LACARON Jul 27, 2008

    Manually cleaning the lens


    To locate the laser lens, look
    around the door or drawer of the DVD player and you will see a small circular
    disc, which is often called the turntable or disc platter. Right off the edge
    of the platter you should see a small clear lens. There are some manufacturers
    that have had problems with the lens, depending on the age of the unit. In
    these problem players, moving the unit to a different location, turning the
    unit upside down, or sometimes even without moving the unit, the lens can
    become detached from the laser assembly and floats around inside the unit. You
    can re-glue it back with a little crazy glue, BUT it must be perfectly
    centered, and without getting any glue on it. So, if you don’t see the plastic
    lens, but instead see the laser pick-up assembly, look around for the lens
    inside the unit and glue it back on.



    To clean the lens you must use very
    little pressure. Take a cotton swab and barely moisten it with plain,
    non-scented, or oily type alcohol. In a swirling motion, very gently rub the
    lens until you’ve covered it entirely. Then repeat using the dry end.



    If the cleaning didn’t help, don’t despair just yet. You can see if there’s
    a problem elsewhere in the unit by using a few simple tricks and tips.


    First thing you want to see if the unit’s laser is in good working order.
    This method isn’t foolproof, but most of the time works admirably. When you
    insert a disc, see if you can look up underneath where the disc sits on the
    turntable. Observe the laser lens going up and down. If the lens is trying to
    focus, that’s good! After a few seconds of the lens trying to focus, the
    platter should start to spin. On almost every CD/DVD unit I've encountered, the
    unit won't spin unless the laser has properly focused on the surface of the
    disc. If the unit spins up and and then shuts down, you should check and make
    sure the laser pick-up assembly slider mechanism is working without any
    obstructions and that the small chrome rail that it slides on is slightly
    greased. Don’t go overboard with the grease though, as too much can cause all
    sorts of problems.


    The slider mechanism, depending on the age of the unit and the manufacturer,
    consists of the small chrome rail, a drive motor, a small gear assembly, and
    (in some units) a small belt that drives the slider unit via the motor. This
    small belt causes all sorts of problems. If the belt is broken or slipping, it
    can cause skipping, dropouts, or simply no start up at all. Also, if the belt
    breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped
    up into the gears, or the pick-up assembly doesn’t return to the start position
    (called home), the unit will (99% of the time) refuse to release the disc, causing
    it to become stuck inside the unit. There’s a little micro or leaf type switch
    located at home position that sometimes gets dirty or breaks and, causing this
    problem also.


    If the disc starts to spin slowly and doesn’t come up to speed, the spindle
    motor that’s attached to the turntable platter is a common problem. There could
    also be a problem with the spindle motor driver controller IC or the power
    supply regulator that supplies voltage to the driver IC. If the disc starts to
    spin and then spins really fast, or stops and starts to spin backwards, your
    problem is the laser pick-up assembly or the servo control circuit. If you
    continue to have problems after cleaning and checking the other things listed
    above, you may have a problem with the player's alignment. Of course, one of
    the problems you'll face checking alignments on a DVD/CD player is that you’re
    going to need to use an oscilloscope on most of them. If you have the proper
    tools and equipment, the first thing to look at is the RF pattern of the unit
    while its playing. It should be a sharp and clear pattern. If it's dull and
    smeared, then the laser could be weak.


    Also, in these units are very critical alignments called the focus/tracking
    gains and offsets. When these alignments are off, it can often cause
    intermittent troubles. As the unit ages and parts change value, so do these
    alignments, and will need to be checked. In my time as service technician
    repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were
    good and only needed a small adjustment. Today's technology makes it unfeasible
    for a shop to hook up a DVD/CD player, and even some recorders, to their
    equipment and make these adjustments because of the cost involved.




  • LORETO LACARON
    LORETO LACARON Aug 01, 2008

    Just click below
    Post region code/hack comment
    Using the remote control open tray
    Press 0, 0, 0
    Region selection will appear.
    Select 0 for no region (ie. all regions)
    Press pause button on remote control.
    Turn Unit off and back on again.
    It should now be region free.
    Test your disk.

    hope this may help;

    Regards,
    VOTIT



  • LORETO LACARON
    LORETO LACARON Aug 11, 2008

    can't read DVD,this is the symptom DVD-ROM problem,only i do is open
    the DVD got a hair dryer reheat the circuit board avoiding the plastic
    connection and the to be direct hit.After its ok can read DVD,,,


    hope this may help;


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  • 13,433 Answers

Possibly dirty lens, Il look into the firmware.

Posted on Jul 26, 2008

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