Question about Toshiba 27A45 27" TV

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Retrace lines in top of tv...

There are some retrace lines in the first 4 inches in the top of the tv. I hoped to find some adjustments on the board (chassis M3S226) and the only 2 I found didn't help. Any clues???

Thanks

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  • Andre Taillefer Jun 17, 2009

    I found a chip that is a LA78041 and I have the schematic on hand. There's a few capacitors but they don't have the numbers you give. I'll need to know more about the capacitors you suggest to change so I can spot the good ones to change.

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These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.
I do not have the service manual at this moment but you can google it by the model number of your TV.
Let me know if you need further assistance.

Posted on Jun 16, 2009

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  • Jaime Hernandez Jun 16, 2009

    These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.

    I do not have the service manual at this moment but you can google it by the model number of your TV.

    Let me know if you need further assistance.

  • Jaime Hernandez Jun 16, 2009

    Check the circuit board and try to find an IC with the following markins LA7847, this IC should be mounted on a heatsink. Once you find it look for C423, C406 and C409. I could also send you a schematic from a model number 27D46 if needed.

  • Jaime Hernandez Jun 18, 2009

    The reason you do not see them is because the ones I mentioend on my previous post was from a different model.

    If you have a pdf file you could send it to me to tell you the ones to replace. My email is jah2mil@hotmail.com

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Look for c407

Posted on Apr 21, 2010

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