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Toshiba TV/DVD-DVD Trials and Tribulations

Discussion in 'Electronic Repair' started by JR North, Jun 1, 2007.

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  1. JR North

    JR North Guest

    So, Toshiba MD9DP1 9" tv/dvd. I know, I know, but let's move on...
    All TV functions OK, only a few hours on the set total time.
    On cold start, the DVD will read the disc properly, and can select any
    title or chapter and start playing normally. After 15-20 min of normal
    play, the picture starts showing digital artifacts. A couple minutes
    into this, the picture starts freezing. Momentarily at first,
    progressing to long 10 min+ freezes with a few seconds of normal play
    If I eject the disc at this point, and reload, the title screen
    displays, and can select between titles (highlight). On select, the
    system freezes. Period. If I set it to play first title on load, the
    first title will start, but again begins with the artifacts and freezes.
    Unplug set for a while, and back to the beginning. Does this with any
    multi title disc. I have played these discs in my other DVD players, and
    they function normally.
    I have a parts unit I can cannibalize the DVD module from, but would
    like some feedback first.
    I should note; I got this unit off Ebay for $10. Brand new in box. The
    CRT was gassed and arcing badly, sending mucho HV down the neck harness.
    I got the 'Parts' unit cheap (case was all beat up) , and swapped the
    CRT from it. I was amazed the unit fired up and worked at all with all
    that HV zapping around, But it did.
  2. jakdedert

    jakdedert Guest

    This may be related to the problem many cheap DVD recorders have:
    excessive heat buildup due to...well, just plain sloppy engineering.
    Try powering up the system with a hair dryer (on the 'no heat' setting)
    blowing across the most obvious heat producing parts. If no problems
    occur, then switch to a low heat setting.

    If the problems occur and are identical, then the solution is obvious.
    Engineer a cooling solution with a small heatsink fan, and/or heatsink
    the components (identified with cooling spray or just calibrated
    fingertip) which get the hottest.

  3. Arfa Daily

    Arfa Daily Guest

    First question is always 'does it play CDs normally ?'

  4. Typical of a bad laser pickup.

    Mark Z.
  5. JR North

    JR North Guest

    Thanks for the input. I played a 1 hr CD (Rock Classics '66 if it
    matters) and it played fine. The Toshiba splash screen was displayed the
    whole time, so I assume the power dissipation of the unit was similar to
    playing a DVD. The track/time dialog worked fine. I then loaded the
    multi title disc, and played the first title (Clash of the Titans); a 2
    hr long flick. Played fine, no anomalies. I let it shift to the second
    title (The Golden Voyage of Sinbad) and it froze 1 minute into the play.
    I reloaded the disc and selected the second title; it started OK, then
    went into it's thing.
    I think this rules out heat as the primary culprit, and also the laser
    pickup. It seems the encoding in the second title is somehow just not
    exactly right for this DVD unit, although the disc plays fine in other
    units. These multi-discs are ones I burned in a Toshiba DVD/R BTW. They
    are DVD-R 4X discs.

  6. Meat Plow

    Meat Plow Guest

    Did you mention earlier how it played a store bought DVD?

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  7. Arfa Daily

    Arfa Daily Guest

    OK. The fact that it plays a CD ok, in general rules out mechanical problems
    such as sticking sled mech, dirty laser, and generally spindle motor, as any
    probs here usually show up even worse on a slower rotating CD. On the other
    hand, playing a CD ok, but not a DVD, is usually a sure pointer to the laser
    itself. Bear in mind that there are usually two different wavelength lasers
    in the same optical block. It is a near infra red for CD, and a shorter
    wavelength visible red for DVD. A further pointer is if it struggles with
    home burn discs over factory pressed ones, as the reflectivity of home burns
    is lower, so any lack of laser performance is further exacerbated by this
    type of disc. A final test that you might try, if it seems to read factory
    pressed commercial titles ok, is playing a film beyond an hour or so. After
    this time, the laser will have reached the edge of the disc, and be working
    its way back on layer 2. This layer is harder for the laser to read, as it
    is reading through the first layer, which is semi transparent. If you start
    getting skips or freezes after this time, or you see the layer change take a
    couple of seconds to happen, this is also a good pointer to a worn laser. If
    the player can read all disc formats, you might try +R or +RW, or even just
    a different brand. The ones that I use come from a local supermarket and are
    real cheap 'own brands', but work in just about every player / recorder that
    I get in for repair. Just in case, I take it that you have cleaned the
    laser's lens anyway ? If the player had not had a lot of use, it's just
    possible that the lens may be a little filmy, particularly if it lives with
    smokers. I have known such a film to affect the performance on CD and DVD
    play differently.

  8. jakdedert

    jakdedert Guest

    Arfa Daily wrote:
    One thing to add to your otherwise informative post (I learned a couple
    of things there, myself), is that most early (otherwise excellent) DVD
    players did not--and never made any claim to be able to--read burned
    CDs. That capability only got common a few years after DVD players
    became a little more common. Most would/will play burned DVDs, however.

  9. Arfa Daily

    Arfa Daily Guest

    Valid point Jak, and one well worth adding

  10. Another point is that most all DVD players made the past several years
    actually have two laser diodes, one for CD and another for DVD. A red-laser
    only type cannot read ordinary CD-R's, since the dyes used are essentially
    invisible to that particular IR wavelength. This is why early Sony DVD
    players (360, 560, etc)will play actually CD-RW but not CD-R.
    It is entirely possible, even likely that it is still the laser pickup bad
    on this Toshiba. They are notorious for this in fact - crappy laser pickups
    and bad spindle motors.

    Mark Z.
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