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Sharp player won't recognize DVD's

Discussion in 'Electronic Repair' started by Greg Laux, Feb 9, 2006.

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  1. Greg Laux

    Greg Laux Guest

    I have a Sharp DV-SL20U DVD player that plays CD's but doesn't recognize
    DVD's. I've cleaned the lens and determined that the laser is working. Can
    anyone help bring this back to life? Thanks.
  2. Arfa Daily

    Arfa Daily Guest

    Failure to play one media type, particularly the way round that you have ie
    plays CD but not DVD, is usually due to a defective laser. As a matter of
    interest, it is very rare to have any problems related to dirty lenses, on
    DVD players. This is because the rotational speed of the disc is so high
    compared to CD, that a significant drag wind builds up under the disc, which
    keeps the lens blown clean of dust deposits.

  3. Hi!
    That's not always true. Compared to a simple audio CD player, you're right.
    However, any computer CD-ROM drive, CD burner, or even a CD player designed
    to use digital audio extraction will spin as fast or much faster than a DVD
    playback drive.

    Besides, doesn't moving more air across the pickup just result in more
    stubborn dust appearing? :)

  4. Arfa Daily

    Arfa Daily Guest

    Hi William,

    not in my experience. In many years of attending to DVD players - since they
    first appeared, I don't think that I can ever remember seeing a dusty
    pickup, like you often see on CD players, or any playability problems being
    cured by cleaning a lens, which they of course often are on CD players. I
    was originally told the ' wind under the disc ' explanation by a Toshiba TLO
    on a training course he was giving, so believe it - or not, as the fancy
    takes you. Always seemed like a reasonable proposition to me.

    You are of course correct in that computer CD ROM drives spin the disc up at
    very high speeds, but the fact that the drive is pretty much closed in means
    that they don't really get dusty anyway, and like DVD drives, they never fix
    by cleaning ...

    None of this alters the fact that the OP's laser is still likely to be
    faulty d;~}

  5. Ken G.

    Ken G. Guest

    Dust sticking depends on where you live . I dont see as much dust on a
    DVD lens but i have seen it . The climate is usualy very dry here and
    dusty . Dust sticks to the sides if furniture etc. far worse than i saw
    when i lived in a damper overall climate .
    If someone has a dirty house with carpet and dogs or kids the dust is
    un-controlable inside electronics here not to mention smokers film ,
    poor cooking or fireplace or oil heat ventilation .
    Here i have fixed several dvd by cleaning the lens . This inclused PS2
    units which kids mostly keep on or near the floor that suck in all the
    dirt .
  6. Greg Laux

    Greg Laux Guest

    I have determined that the laser works by putting in a transparent disc and
    looking at the laser through the disc while it searches for the dvd info.
    The laser is on. Any other thoughts?
  7. Arfa Daily

    Arfa Daily Guest

    Being able to see the laser burning, unfortunately does nothing to prove
    that the optical block overall is working, as it contains the pickup(s) as
    well. Also, being able to see the laser burning, tells you nothing about the
    output power of the laser. This is critical to correct operation of the
    optical block, and the following circuitry. Trust me, the lasers do wear
    out, and failure to play one media type, usually DVDs, is a very typical

  8. Ray L. Volts

    Ray L. Volts Guest

    Yes. Stop looking at laser beams! Seriously, though, an imperfect
    transparency might offer enough diffusion so as to decrease the danger a
    bit, but it's still not a bright idea [pardon pun] to look at it.
  9. Ken G.

    Ken G. Guest

    The lazer can light up real bright and still not work . I run into this
    all the time . Its not good to stare at a lazer
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