TV power problem, relay clicks, only turns on when you hit it

Discussion in 'Electronic Repair' started by lostintaipei@gmail.com, May 29, 2006.

  1. Guest

    I have a Toshiba 27" made in 92.

    There is a bit of a problem with turning it on. Turning off is always
    fine. The remote doesn't turn it on, but I hear a relay click. Also,
    doesn't turn on with the front switch under normal pushing...but also
    hear a relay click.
    The only way it turns on, is but hitting the front "ON" switch really
    hard, to move or jiggle the set, or the hit the ON switch followed by
    hitting the set in a certain sequence.

    I believe it may be the relay, or some kind of mechanical part or
    connection because you seem to need to hit the set to turn it on. Would
    like some opinions before I pursue this farther. I'm not a TV repair
    expert by the way.

    Anyone have any suggestions... anyone know what the relay looks like?
     
    , May 29, 2006
    #1
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  2. Franc Zabkar Guest

    On 29 May 2006 12:24:20 -0700, put finger to
    keyboard and composed:

    >I have a Toshiba 27" made in 92.
    >
    >There is a bit of a problem with turning it on. Turning off is always
    >fine. The remote doesn't turn it on, but I hear a relay click. Also,
    >doesn't turn on with the front switch under normal pushing...but also
    >hear a relay click.
    >The only way it turns on, is but hitting the front "ON" switch really
    >hard, to move or jiggle the set, or the hit the ON switch followed by
    >hitting the set in a certain sequence.
    >
    >I believe it may be the relay, or some kind of mechanical part or
    >connection because you seem to need to hit the set to turn it on. Would
    >like some opinions before I pursue this farther. I'm not a TV repair
    >expert by the way.


    No kidding. :)

    >Anyone have any suggestions


    It sounds like the set may have a dry joint. I suggest you reflow all
    suspect solder joints before you make the problem worse.

    >... anyone know what the relay looks like?


    It is usually rectangular with 4 pins. It may have a transparent case
    through which you would see the coil and contacts.

    - Franc Zabkar
    --
    Please remove one 'i' from my address when replying by email.
     
    Franc Zabkar, May 29, 2006
    #2
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  3. b Guest

    ha escrito:

    > I have a Toshiba 27" made in 92.
    >
    > There is a bit of a problem with turning it on. Turning off is always
    > fine. The remote doesn't turn it on, but I hear a relay click. Also,
    > doesn't turn on with the front switch under normal pushing...but also
    > hear a relay click.
    > The only way it turns on, is but hitting the front "ON" switch really
    > hard, to move or jiggle the set, or the hit the ON switch followed by
    > hitting the set in a certain sequence.
    >
    > I believe it may be the relay, or some kind of mechanical part or
    > connection because you seem to need to hit the set to turn it on. Would
    > like some opinions before I pursue this farther. I'm not a TV repair
    > expert by the way.
    >
    > Anyone have any suggestions... anyone know what the relay looks like?


    you will need to resolder the power supply and high voltage components
    where heating and cooling cycles have led to the solder becoing
    cracked. if in doubt, have a tech do this simple and hopefully
    inexpensive work, or you could end up trashing the set.
    -B.
     
    b, May 30, 2006
    #3
  4. Yukio YANO Guest

    wrote:
    > I have a Toshiba 27" made in 92.
    >
    >
    >
    > Anyone have any suggestions... anyone know what the relay looks like?
    >


    With the back off the set, using a mirror, turn on the set using the
    Remote !, Listen for the Relay to click ON !! and OFF. Should be close
    to the back of the Set.

    My guess is the relay is about to give up the ghost entirely, ie I
    suspect the relay contacts are badly cooked.

    This should come as no surprise after all, I would guess the tiny
    contacts have switched ~ 500 watts about 20,000 times, over 15 years of use.

    The QD. quick and dirty, is to permanently solder the appropriate traces
    on the motherboard to leave the set ON permanently and turn OFF by
    un-plugging the Set, or use a switched Power-bar.
    The final cure will then be to replace it with a BIG SCREEN TV (HD),
    partially paid for by forgoing the cost of replacing the Relay.

    Yukio YANO
     
    Yukio YANO, May 30, 2006
    #4
  5. sofie Guest

    A wild guess.... to be sure!
    --
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



    "Yukio YANO" <> wrote in message
    news:Cn0fg.214246$WI1.194537@pd7tw2no...
    >
    > My guess is the relay is about to give up the ghost entirely, ie I
    > suspect the relay contacts are badly cooked.
    >


    > Yukio YANO
     
    sofie, May 30, 2006
    #5
  6. Yukio YANO Guest

    sofie wrote:
    > A wild guess.... to be sure!


    Less wild than the two previous posters call for COLD SOLDER JOINTS !, I
    would even bet a case of beer on it. We could get the O/P to umpire the
    call.
    Yukio

    I traced the Relay on another TV with the same symptoms same way, was
    surprised by how small it was. These contacts are supposed to last a
    hundred thousand cycles !
     
    Yukio YANO, May 30, 2006
    #6
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