Question about Toshiba 55H70 55" Rear Projection Television

1 Answer

I have a Toshiba 55H70 that started with convergence issues when we moved. I have done some reading and understand that this is a common problem. I ordered new IC chips and installed them, I also checked the resistors. The problem has not changed at all the colors still do not line up and the pic is distorted. Any ideas?

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  • Steve Dec 10, 2009

    Ok, I've looked for the fuse that you described and I don't see it. I'm looking on the green video board, correct? Not the brown power board. Also the fuse that I'm looking for, is the board label FA something or the fuse itself? Thanks

  • Steve Dec 10, 2009

    I found 6 fuses that were labeled with an F none were labeled with an FA. I'm assuming that F stands for "fuse", C for "capacitor", and R for "resistor". If it is a fuse then am I correct in thinking that it should have little resistance? The fuses on the board all have either 2 or 3 ohms of resistance.

  • Steve Dec 10, 2009

    Yes if you could that would be great. Email is nutcase2be@gmail.com What is the best way to see/ get a copy of that service bulletin? Thanks for all the help, I really appreciate the info. and help.

  • Steve Dec 10, 2009

    Never mind about the bulletin, I see that the part num. is just followed by a "T".

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  • Master
  • 834 Answers

This is a very old set and the problem you descrbe , sounds like the ics are not getting their -32 and +32 volts and this could be a fuse i do not have a diagram on habd due to age and I checked toshiba website and they no longer support this set i can tell you that
the fuse im talking about has a label of FA something it looks like a rectalngle cap take a look arounf the deflection board that is the one with the flyback on it

Posted on Dec 10, 2009

  • 3 more comments 
  • Dave Naylor
    Dave Naylor Dec 10, 2009

    no you should be looking on the power board and it should be labeled on the board itself

  • Dave Naylor
    Dave Naylor Dec 10, 2009

    ok then they are good the problem in in the convergance digital board , and in check not avail

  • Dave Naylor
    Dave Naylor Dec 10, 2009

    the fuses i was talking about are f 850 and 851 located near t852 if you would like i did find the diagrma and i could try to send it to you via email if you want to supply me you email address

  • Dave Naylor
    Dave Naylor Dec 10, 2009

    there is a service bulletin to replace the convergance ic with 392-110 T only they are a shronger ic

  • Dave Naylor
    Dave Naylor Dec 10, 2009

    there is a service bulletin to replace the convergance ic with 392-110 T only they are a shronger ic

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