Question about Toshiba TP50H50 50" Rear Projection Television

2 Answers

My TP50H50 is turning on for a short time and goes off. Power light continues flashing. remote control or power button will not stop it from flashing. I have to unplug the tv and wait a minute or longer before it will come back on. most of the time now when I plug it back in you can hear a couple of clicks and the power light goes back to flashing, no picture. Every once in a while it will come on and stay on, but not very often. I removed the front panel and cleaned out dust. This seemed to help for a short time only. Is this fixable or should I look for a new TV. The picture on this one is great when it runs.

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  • Mike H Jan 01, 2011

    Since I am somewhat a novice, I have been in the back of this tv, and there are many boards. If you could point me in the right direction of the power board I am sure I can figure it out from there.....Thanks

  • Mike H Jan 01, 2011

    Is it possible for the tv to still work even with a dead power board?

  • Mike H Jan 01, 2011

    Can the power board be intermitent? If not, would you have another solution for the issue that I have explained above?

  • Mike H Jan 01, 2011

    Great explanation, thanks. I have looked at all the capacitors on and around the power supply board, and they look normal, no bulging that I could see. Is there another possible solution? By the way I put the tv back together and after a few tries with unplugging and plugging in the power,and the relay clicking in and out the tv is staying on for now.

  • Mike H Jan 01, 2011

    Great explanation thanks. I have looked at the capacitors on and around the power supply board and they all appear normal to me, no bulging is evident. Could there be another possible solution? By the way, I put the tv back together and after several tries with plugging and unplugging power cord and listening to the relay click in and out the tv is now staying on.

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2 Answers

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  • Toshiba Master
  • 6,993 Answers

Hello,

you can get to the power board by tracing the AC wire right into the TV. AC wire is the wire that is plugged into the wall for electricity. Just trace this wire to the TV. The wire goes straight into the power board.

Once you are able to get to the spot where the wire passes into the TV, then you have gotten to the power board.

Good luck.

Posted on Jan 01, 2011

  • 1 more comment 
  • Walesarumi
    Walesarumi Jan 01, 2011

    No, its not possible. The TV can never work with a bad power board.

  • Walesarumi
    Walesarumi Jan 01, 2011

    Hello,

    The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

    The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

    I do not think it needs replacement, rather some defective capacitors are causing this issue.
    Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

    The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

    You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

    What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

    You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
    After replacing these capacitor(capacitors) most likely the normal operation will be restored.

    Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

    If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

    I hope this helps.

  • Walesarumi
    Walesarumi Jan 01, 2011

    Hello,

    that's one funny thing about TV. Some times while tempering with it, it can just peak up and start working. This might have something to do with the line transformer.

    If the TV refuses to power on again, clean out all the components on the TV panel and power board with a paint brush.

    Maybe there is nothing pretty much wrong with the TV, it might just need servicing.

    Good luck again.

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  • Master
  • 1,622 Answers

Hello,

Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.


Hope this help in solving the problem....

Posted on Jan 01, 2011

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