Question about Toshiba Projection Televisions

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The TV comes on and after a while, the video/picture goes black while the audio continues. I hold down the off button for 5 sec (to reset) and sometimes it comes back on, sometimes it takes many tries. Once on again the video/picture continues from anywhere 5 min to 30 min or more and it goes out again. I've tried to punch recall as well...sometimes the picture returns sometimes not.

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  • IreneMatt Sep 04, 2008

    This is an Integrated High Definition LCD TV not a projection TV

  • IreneMatt Sep 04, 2008

    It's only one year old

  • IreneMatt Sep 04, 2008

    Toshiba Regza 32HL67 is the make and model

  • IreneMatt Sep 04, 2008

    no semblance of video with flashlight and/or volume held

  • IreneMatt Sep 04, 2008

    The TV is fairly close to a wall and there is a shelf above it, so I moved it forward perhaps to allow more air to circulate. The top of the back unit was pretty hot before I turned it off. This a.m. it was cool again. Do you think moving the TV forward might help?

  • IreneMatt Sep 04, 2008

    We're also thinking of raising the shelf above the TV 3 inches for more air flow. Just wasted effort?

  • IreneMatt Sep 04, 2008

    Good feedback, problem not yet solved, but we have alternatives. Thanks Benimur

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  • Master
  • 6,966 Answers

Hi,

This could be indicative of the built-in protection circuitry kicking in to prevent further damage to the unit. It has sensed a fault and therefore shuts the unit off. Alternately, it may be heat related. A component is heating up and triggering the unit to turn off.

Further diagnosis/repairs of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back the brand and model, how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 04, 2008

  • 3 more comments 
  • Louie  Role
    Louie Role Sep 04, 2008

    Hi again,

    Appreciate your comment/postback.

    All LCD type TV have multiple backlight (CCF lamps) that are powered by a high voltage/high frequency inverter. This inverter, the CCF lamps and the other electronics on the PCBoard of the HD LCD TV all produces considerable heat. This heat is detrimental to the operation of most (if not all) electronic components. Particularly prone to heat damage are the capacitors that would dry up, burst or simply fail to operate.

    Pls post back the brand and specific model



  • Louie  Role
    Louie Role Sep 04, 2008

    Got it thanks.

  • Louie  Role
    Louie Role Sep 04, 2008

    Perhaps you could try a check.

    When the picture goes black (but with sound), could you pls try shining a flashlight at an angle to the screen and see if there is a semblance of the video. You could also try pressing on the volume control while doing this and focus on the area where the volume level is normally shown.


  • Louie  Role
    Louie Role Sep 04, 2008

    That being the case and if you are considering a DIY, then the back cover of the unit has to be opened and voltage measurements done on the components. You may want to start checking the driver board.

    Otherwise, an onsite qualified professional or a service center maybe your best bet.



  • Louie  Role
    Louie Role Sep 04, 2008

    Since the unit operates normally but would develop picture fault after a few minutes, you could try improving the ventilation at the rear as you have posted or additionally/alternately, install temporarily a blower/electric fan. If the problem persists, then it is an internal problem, if length of time for the picture to be gone, then you have just confirmed that it is heat related.

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1 Answer

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