Question about Toshiba 57H82 57" Rear Projection Television

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No picture, no sound the tv was working normaly then ther was a muffled thump from it and it went off.

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Hi,
Is power indicator on tv front lit/ blinks then tv got problem in deflection section and most probably in horizontal deflection section.
And if power indicator on tv does not lit at all then problem would be in power supply section that got damaged for some reason.
I'm not sure about your electronics knowledge and skills so local tv repair shop will help you get tv fixed.
Hope these info will help you.
Thanks.

Posted on Jul 17, 2010

  • 12 more comments 
  • rawkdw2000 Jul 18, 2010

    Power light acts normally. Comes on when I push the power button, no blinking, and off when pushed again.



    Rick



    P.S. I have some knowledge of electronics. I am a Ham and I have replaced the convergence amps in this set.

  • Shahid Electronics
    Shahid Electronics Jul 18, 2010

    OK, you need to have service manual copy in hand to check power supply output voltage for horizontal output section (it calls +B), schematics in service manual will help you.

  • Shahid Electronics
    Shahid Electronics Jul 18, 2010

    Forgot to mention, required service manual Toshiba 57H82 can be downloaded from HERE for small fee, please make sure that your tv model is 57H82 as its being shown on question header.
    If tv model number is different, let me know.



  • rawkdw2000 Jul 21, 2010

    Of the 11 pico fuses on the board 6 were ok 3 were bad and 2 I can't get to without removing the board. Not sure were to check for +B

  • Shahid Electronics
    Shahid Electronics Jul 21, 2010

    If you got service manual then check +120V (+B) that goes to flyback to drive horizontal deflection section, and yes, replace all open (blown) pico fuses.




  • rawkdw2000 Jul 21, 2010

    There's no place to check voltage to flyback unless I remove circuit board. Unless i"m missing something.

  • Shahid Electronics
    Shahid Electronics Jul 21, 2010

    Yes, tv chassis will need to be taken out from tv cabinet and turn it so you can easily see circuit boards to test voltages.



  • rawkdw2000 Jul 22, 2010

    How do I remove high voltage wires from flyback without killing myself? Will they just pull out or is there a lock of some kind?

  • Shahid Electronics
    Shahid Electronics Jul 22, 2010

    High voltage wire can be unplug from high voltage block that has similar wires coming from three picture tubes. Press wire end and rotate it 45 degree to unlock then pull it out.

    Caution: DO NOT turn tv while high voltage wire is out. That will give you high voltage electric shock or its spark might burn other parts in tv. TV can only be turned on if high voltage wires are intact properly in high voltage block.


  • Shahid Electronics
    Shahid Electronics Jul 22, 2010

    Caution: DO NOT turn ON tv while high voltage wire is out.

  • rawkdw2000 Jul 22, 2010

    I also noticed 2 of the blown fuses feed the convergence amps.

  • Shahid Electronics
    Shahid Electronics Jul 22, 2010

    OK, replace these 2 fuses and if they blow again that means convergence output chips are defective and will be replaced.



  • rawkdw2000 Jul 26, 2010

    Parts Ordered.

  • Shahid Electronics
    Shahid Electronics Jul 26, 2010

    Great, I'm sure you will fix it.



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