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Panasonic DVD-S27 acting odd

Discussion in 'Electronic Repair' started by Mark Modrall, May 28, 2007.

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  1. Mark Modrall

    Mark Modrall Guest

    Hi...

    We've got a Panasonic dvd player (the S27). It's been through about 4
    years of good use, but the last couple of days it's been acting very
    strangely. You put in a disk, and as it puts up the progress bar of
    reading the directory it gets 1 tick in and then shuts down completely.
    Won't power back up unless you unplug it, leave it for 30 seconds, then
    plug it back in.

    Of course when it comes back up it does the same thing - start reading
    the disk, then fritz.

    Anything to do with this other than replace it?

    Thanks
    Mark
     
  2. Guest

    Google to the panasonic website. Click on support for the device
    type. Find your model number, go to downloads. download the latest
    FIRMWARE for your dvd player. You must remember where it was saved to
    on the harddrive. I recommend saving to the desk top. burn the saved
    file to a blank dvd disk . Then follow installation instuctions for
    the firmware upgrade. YOU MUST BE VERY
    CAREFUL TO FOLLOW THE INSTALL INSTRUCTIONS TO THE LETTER. HOPE THIS
    HELPS.
     
  3. Arfa Daily

    Arfa Daily Guest

    Does it still read a CD ?

    Arfa
     
  4. Mark Modrall

    Mark Modrall Guest

    Nope... It starts reading the directory then shuts off completely.
    Can't be powered back on unless you unplug it for 30 seconds. Can't get
    anything to play.

    -Mark
     
  5. Arfa Daily

    Arfa Daily Guest

    Have you been inside at all to have a look what is happening in the time
    that it remains on ? Most Panasonic models suffer from bad spindle motors,
    and yours is the right sort of age. Have a look to see if the disc actually
    tries to spin up. If it doesn't, try just flicking it round with a finger.
    Sometimes, the motors go so bad that when the player tries to spin it up,
    the power supply detects an excess load, and shuts down.

    Arfa
     
  6. Bad power supply caps?

    Mark Z.
     
  7. Arfa Daily

    Arfa Daily Guest

    That's a good thought Mark. I haven't known Pans to be particularly bad in
    this respect, unlike some of the other makes that we all know and love (
    !! ) but worth a shot.

    Mark whose machine it is - start by having a good look at all the
    electrolytics in the power supply. Check for any where their tops have
    started to 'dome'. If none are evident, it would be worth running over them
    all with an ESR meter.

    Arfa
     
  8. Mark Modrall

    Mark Modrall Guest

    Sorry to take so long to respond... Day job and all that. Took the top
    off this weekend to see what was happening. As Arfa guess, it wasn't
    actually spinning up. It just sat there. There was a buzz at the
    start, then it shut down.

    Interestingly, I flicked it around with a finger a few times, and the
    next time it *did* spin up - for a few combinations of on/off,
    open/close. Then it stopped spinning up again. Went back and forth
    with the finger flick every time it seemed to "jam" and after a few go
    rounds it just seemed to spin up again normally. Not that I'm holding
    my breath on it.

    I didn't see anything looking to "dome" on the inside, but then I am
    just a novice.

    I also looked at the back, and it seems that it's just 3 years old, not
    4.

    Am I correct in guessing that it sounds like the spindle motor? Would
    it be worth fixing if it is, or would that cost near the same as a new
    unit for one who isn't in the repair business?

    Thanks
    mark
     
  9. Arfa Daily

    Arfa Daily Guest

    Assuming that you are saying that once you get it to spin up, it does read
    and play ok, then yes, that would be indicative of a bad spot on the spindle
    motor. On most Panasonics, the spindle motor comes preassembled onto a sub
    deck, that you then have to swap the laser onto. Mechanically, this is not
    too tricky. However, there is then usually an alignment procedure for
    correcting the laser tilt, which involves adjusting three hex screws under
    the spring loaded laser slide rails, whilst watching the effect on the
    jitter factor by way of an internal diagnostic display. This is not an easy
    procedure. You might check if the deck assembly is available complete with
    the laser for a reasonable price, as then it would be just a drop in job.

    There is a way that you can 'recover' a bad motor, but really, it would only
    normally be used to 'prove the point', and I would not do it on a customer's
    repair. However, as it's your own unit, and it doesn't work now, I guess
    you've got nothing to lose. You will need a 12v DC power supply, and some
    switch cleaner. You need to first disconnect both connections to the motor.
    It is important that the motor is completely disconnected from the external
    circuitry. The connections are usually made to it via an orange flexiprint
    which will need to be unsoldered. This will reveal two kidney-shaped holes
    in the motor backplate. Put a small squib of switch cleaner in each hole,
    then connect the 12v power supply BRIEFLY across the motor 4 or 5 times. No
    more than about a half second for the first few connections, and maybe a
    little longer - say 1 second - for the last one. Wait 30 seconds or so, then
    repeat the procedure with the connections from the power supply reversed, so
    that the motor spins the opposite way. 95% of the time, this procedure will
    successfully recover a motor with a bad spot. On the odd 5% of occasions, it
    will result in total demise of the motor, but as I said, you haven't got a
    lot to lose.

    Arfa
     
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