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Digital Stream DTV converter failed

Discussion in 'Electronic Design' started by [email protected], Aug 25, 2012.

  1. Guest

    I bought it several years ago, but it was just in the closet as a spare.
    I've only used this DTV converter for a couple months. Today it
    suddenly just shut off and left snow on the tv screen. If I unplug it,
    the front LED lights for a second and shuts off. I'm suspecting a
    capacitor.... Anyone know of a common problem with these converters?

    Thanks
     
  2. Guest

    We had a thunderstorm last night, but it did not fail till hours later.
    However it's possible the storm did some damage. This converter is in
    my workshop so I dont know which model I haveright now, but they only
    made 2 or 3 models. I believe mine has analog passthru. I'll have to
    open it and look at the caps. Seems this is the #1 problem on all
    electronics these days. Too bad they make such crappy caps these days.
    Hell, I have old radios and stuff from the 60s and 70's that still work
    fine and no caps have been replaced. I think this is preplanned
    failure. If they could make good and long lasting caps 50 years ago,
    why cant they make them as good or better now?
     
  3. Phil Allison

    Phil Allison Guest

    ** They can and they do - but you need to pay a bit more for them. Name
    brand electros rarely give any trouble in sensibly designed circuits and can
    last more than 20 years.

    The electros that show short lives are usually of the "no brand " kind, are
    extraordinarily small for their ratings and are forced to run hot in the
    particular device. All the above are ways to economise.

    Another big factor is where the electros are used in a device ( like a
    television STB, wall wart SMPS or PC power supply ) that is operating
    almost 24/7. This means they clock up over 8000 hours a year and that is a
    LOT of use.

    Fitting name brand ( ie Nippon Chemi-Con or Panasonic ) electros to my STB
    and switching it OFF at the AC supply -electro cap life has been multiplied
    by 5 times or more.


    ..... Phil
     
  4. Packratpaul

    Packratpaul Guest

    snip bunches......
    Read all about it here....Paul

    http://en.wikipedia.org/wiki/Capacitor_plague
     
  5. Guest

    That's an unfair comparison. In the '60s and '70s, switching power supplies
    were rare, they were ten times larger, and didn't work 24x7. Perhaps you'd
    like to go backwards, but I much prefer the consumer electronics we have
    today.
     
  6. Guest

    I opened it and there are no bulging caps or noticable burnt parts. I
    checked the voltages on the plug from power supply board to main board.
    From ground (black wire) to red, I get 5 volts. From black to orange I
    get 3 volts. Shouldn't that be 12 volts rather than 3v?

    When I plug in that plug to the main board, or plug in the entire unit
    to a wall outlet, the green LED only lights for a second or less.

    Thanks for all help.
     
  7. Grant

    Grant Guest

    Maybe he was looking for s.e.despair? :eek:)

    Grant.
     
  8. Guest

    It's not marked, but all computers have 12 and 5 volt from their power
    supply, and those converters are similer.

    I wish they put schematics for those DTV boxes on the web.....
    Because AIOE has that group blocked. I tried it already. It;s been
    blocked for at least a year or more.
     
  9. whit3rd

    whit3rd Guest

    It's likely a digital converter will need lots of 3.3V for logic, some +30V for
    tuner functions, and maybe +/- voltages for serial port/remote/smart antenna.
    The O.P. has a 120VAC input box, and there's lots of internal power, probably
    little if any is 12V or 5V.
     
  10. Guest

    After using a magnifying glass, I noticed it says 5v and 3.3v on the
    board, plus grounds, by that plug. So, the voltages are correct. And
    here's a real weird one. There is a metal cover over the input ANT and
    output TV connectors. I popped that cover off, and the converter began
    working, and has been working ever since. I put it all back together
    and it's working fine. However, I found a dried up bug inside of it.
    Could that bug have shorted something until it dried??????
    Guess I'll never know.....
    It's woking perfectly again, and has been on for 2 days.
     
  11. Guest

    <<<LOL>>>

    Thanks for the laugh!!!
     
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