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TOSHIBA 35a44 Chassis no. TAC 426. The TV volume started to go to 0 all by it self. When this happens the function stays active as if I'm commanding ''Volume Down'' ,(Remote or panel buttons),and no other functions are allowed. From time to time it will stop commanding volume down and will allow you to turn the volume up and as soon as you release the command the volume returns to 0 by itself, also the TV eventually stopped doing this for a couple of weeks. All was fine, then back to this problem and then it wouldn't turn on at all. After having it unplugged for awhile and looking at the board looking for burnt components, bad solder joints, and visually obvious problems, the TV now turns back on and I am back to my original problem.

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  • chritcher Sep 08, 2009

    THE REMOTE IS NOT THE ISSUE. I USE THE DISH REMOTE AND THE TV REMOTE. I REMOVED THE BATTERIES FROM THE REMOTES AND THE TV ACTS THE SAME. OHMED FRONT PANEL SWITCHES ALL WORK CORRECT.

  • chritcher Sep 08, 2009

    THE REMOTE IS NOT THE ISSUE. I USE THE DISH REMOTE AND THE TV REMOTE. I REMOVED THE BATTERIES FROM THE REMOTES AND THE TV ACTS THE SAME. OHMED FRONT PANEL SWITCHES ALL WORK CORRECT.

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Try to check the pannel and the remote "volume down" buttons - one of them could be stuck in a pressed position.

It usually happens on the remote when dirt or sticky substances accumulate around the rubber buttons - you need to disassemble the remote and clean the rubber pad and the remote housing with some ethyl alcohol and cottonwool, also clean well the holes on the housing where the buttons protrude.

If you also decide to clean the contact tabs on the rubber pad and the circuit board, you should clean them gently to avoid damaging the conductive coating.

I hope this helps somewhat.

regards

3rq8 (Triarcuate)

Posted on Sep 08, 2009

  • 4L60B4R1UM Sep 08, 2009

    Try to check the pannel and the remote "volume down" buttons - one of them could be stuck in a pressed position.



    It usually happens on the remote when dirt or sticky substances accumulate around the rubber buttons - you need to disassemble the remote and clean the rubber pad and the remote housing with some ethyl alcohol and cottonwool, also clean well the holes on the housing where the buttons protrude.



    If you also decide to clean the contact tabs on the rubber pad and the circuit board, you should clean them gently to avoid damaging the conductive coating.



    I hope this helps somewhat.



    regards



    3rq8 (Triarcuate)

  • 4L60B4R1UM Sep 08, 2009

    Next things i would have checked:



    - remote sensor pins on the TV, any connectors or wires going from there to the main board, the sensor decoder IC and the associated components (power supply electrolytic capacitors, resistors, diodes, etc) - a detailed schematic would be very helpful here



    - TV's audio amp section and amp control section, any connectors around there, power supply capacitors in the audio section (possibly also capacitors in the main power supply) - again, a schematic will save you a lot of time.



    Bad electrolytic filter capacitors in any section will often cause power supply disturbances that may result in a malfunction or erratic behaviour of that section of the TV set.



    If any capacitors are bulged / blown at the top, they need to be replaced.

    There may also be dried out filter capacitors which don't show external damage - these would require scope metering and / or voltage measuring, or you can parallel them with good ones (yes, one by one, until you eventually find the one that is bad - assuming there is one).



    That's about all i can suggest, maybe try to see if there is any change when you disconnect the dish unit from your TV (a bit unlikely but you can try it).



    Thanks for your comment



    regards



    3rq8 (Triarcuate)

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