Question about Toshiba 42HP83 42 in. HD-Ready Plasma Television

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No power I have a Toshiba 42hp83 plasma that will not power on.I am getting 120volts from the power cord but no power to tv.Any help would be appreciated.Thank you.

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  • lee777 Nov 27, 2007

    I am not sure where these are located.I do know that I am getting power from the wire and it is running to the coil next to it but,that"s it.Shop is asking $500.00 to fix it.I took electronics in college and I do have some knowledge of how circuits work.I would really like to fix this myself.I have been combing the web looking for a schematic but, with no luck.

  • lee777 Nov 28, 2007

    found service manual with schematic.Checked the areas you suggested and they are fine.I am still getting no power.

  • lee777 Nov 29, 2007

    It states that the main power board is bad.Ptf-422.I checked to see if The tv was getting power to the lowb1 board and it had no voltage in the wires.

  • Anonymous Sep 08, 2008

    my tv will not power on



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  • 934 Answers

Something VERY common in this unit that can cause multiple problems, depending on the pins involved, are bad solder connections at PF01 on the micon module and socket PJ109 on the scaler module. Symptoms include; dead set, no picture, picture all one color, intermittent picture or shutdown.
If you do it have a good light and a quality magnification of some type. If you have a shop do it take it to them and ask for an estimate first.
Good Luck!

Posted on Nov 25, 2007

  • William Rayburn
    William Rayburn Nov 28, 2007


    I ass-u-me you got a written estimate? What does it show for parts requirement?


  • William Rayburn
    William Rayburn Nov 29, 2007

    That's it then - the SMPS has failed and that's only a modular replacement or rebuild and that's why the tech is charging $500.00 because the board is fairly expensive.. I show that as Toshiba p/n# 23122442 at $299.95 plus shipping and core. If the shop quoted you $500.00 that's a real bargain and I'd strongly consider letting them make the repair for several reasons - not least of which is the repair warranty they'll give you on parts and labor.. If you're still insistent that's the part you need. But I would be extra careful powering this up after replacement. Use a variac to bring it up at 90v until you know that there is no other shorts or failed components that could have contributed to the SMPS failure.




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