Question about Toshiba 55H70 55" Rear Projection Television

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Flickers caves in on sides then shuts down

I had convergence chips replaced, and the repairman resodered suspect connections. TV worked for a couple of months with perfect resolution and then sudently went back to the same flickering and shutting down. It has been in a local toshiba dealer repair shop for two weeks and they say they cant find the problem. They said they replaced a couple of bad capacitors but didn't help. They suggest I buy a new TV?

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  • gtracy2117 Feb 18, 2008

    Could you give me a ball park idea of how much a new board might cost? Thanks so much!

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I can understand the frustration of the repair shop, as getting help from Toshiba is almost non existent. When the boards in any big screen gets hot and used, many components on the board degrade and in your case, it sounds as though the fix would be a replacement board. Unfortunately, you may not be able to get one. If your local repair shop can't find the problem you might ask them for the board number and do some research on your own for a board. Most wholesalers will sell to the consumer if you have a credit card, and if you can find the board, have your local shop install the new/refirb board and do whatever adjustments are necessary. Good luck. I hope this has helped in some way
Ed
NC Electronics
Mills, Wyoming
Have a Great Presidents Day

Posted on Feb 18, 2008

  • Ed Meshechek
    Ed Meshechek Feb 18, 2008

    I just called last Friday on another model and the price was 482.00. Although the set I called on was a different model, I have found that the convergence boards run anywhere from 350 to 700 dollars, depending on what it is. It's sure not cheap.

    Since I personally own the exact type of set you have, I personally think the set is worth the value.( I am fortunate that I have not had any problems on mine yet ) I hope you get your problem solved in a timely and inexpensive manner.

    Good Luck

    Ed

    NC Electronics

    Mills, Wyoming

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I've suspected a convergence chips failure not the power supply board issue in this kind of symptoms. To confirm it, locate the convergence board inside the set, it has a Sanyo convergence chip STK392-110 that are mounted on the large heat sink. This board has a LED (light emitting diode) that will light up once the board gone to malfunction. Turn on the unit and then check if the LED will lit after the shuts down. If yes, then I would advice you to replaced both convergence Chips and check the resistance of the resistors in line with the +25V and -20V supply of the chips.
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