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TOUCH FOCUS ERROR on Projection Toshiba TV

Hello Guru. I am getting the same error as ronny. My Toshiba has the TOUCH FOCUS ERROR message and the blue lines do not converge. I see a resolution was posted to replace the convergence IC's and that the Low OHM Resistors need to be checked for proper value.

Can you tell me how to do that? Thanks... I also have the same issue with my Toshiba 51inch rear projection. Also it is very "scratchy" and out of focus for the first 5 minutes that it is on (then it clears up - I can deal with that one!)

Looks 3D Red lines are off balance.
When we hit the automatic touch focus --it say touch focus error.
you can see how the blue and green lines vertical and horizontal are straight. The red has a moon shape to it.

I am not able to clear the Red focus error. I cannot find anyone in my area who will service Toshiba. Help me Please. TY

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  • shez126 Nov 23, 2008

    Thank You so very much.

  • shez126 Nov 23, 2008

    Ginko, Thanks so much. Where can I find the part number for the Toshiba 51H84 Convergence Board?

  • shez126 Nov 23, 2008

    I was just informed that my television is a 50H82 NOT the 51H84. Does this change the part number? Im sorry. I was misinformed. Thanks again



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The lowh OHM resistors are small resistors at the base of the convergence ICs, you need to test them for continuity using a multimeter.

Posted on Nov 23, 2008

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  • Ginko
    Ginko Nov 23, 2008

    To do the job you need experience in testing electronics and doing precision soldering.

    Better also to grab the service manual before starting the job. So that you can follow schematics and diagrams.

    You first test the small resistors at the base of the convergence ICs using a multimeter set to read impedance. If impedance is infinite, then the resistor had blown because the IC is faulty.

    A good alternative to replacing the ICs is replacing the whole convergence board. This is easier than replacing the ICs , even if more expensive. See : Toshiba Parts
    and Accessories
    or Partstore.

    To find Toshiba service in your area you can call Toshiba at 800-631-3811
    or see

  • Ginko
    Ginko Nov 23, 2008

    This should be the part, double check with the seller by calling them by phone and giving your model number first.: PD1731A1 PCB CONV, Toshiba 23761974X

    Vance Baldwin also have the part.Toshiba - Vance Baldwin Electronics

    Here is an used board, but buying that is a risk, I suggest buying a new one.

    Before buying the part perform a full convergence setup procedure by following the service manual. Convergence setup must be performed also after replacing the board.

    See if you can buy the service manual here :">TV Tech Center :: Service Manuals :: Toshiba :: 51H84

    The board is expensive. ICs are much cheaper, just $7.99 each, but they are more difficult to install.

    Here is explained how to do.

  • Ginko
    Ginko Nov 24, 2008

    50H82is different, on 50H82 test also the hyper board that can give you picture problems that can easilyt been confused with convergence problems.

    Get the Service manual first, then follow the troubleshooting diagrams, on this model it will tell you to check convergence ICs and a group of capacitors on hyper board.
    You find the part number for 50H82 convergence board on service manual , or ask to the dealers in my previous comment ( Toshiba Parts
    and Accessories
    or Partstore).

    The ICs are stk392-110 ICs, same as the other module.

    See the following websites to buy the service manual.

    Service Manual 50H82

    TOSHIBA 50H82

    Toshiba - 50H82 Service Manual



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SOURCE: TOUCH FOCUS ERROR on Projection Toshiba TV

i hope it doesn't fail again ebay parts have been know to fail because some are look a likes. trust a well know company like MCM electronics or B&D electronics
glad it fixed it for you

Posted on Dec 19, 2007

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