Question about Toshiba 42H81 42" Rear Projection Television

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Projected colors separated

Hi,

I have a 6 year old Toshiba 42H81 and the colors have separated. The picture appears correctly, but the green is shifted a couple inches to the right. Everything else works fine. The picture used to just shiver for a couple minutes each time the TV was turned on, but now it's completely separated. When I bought it, the salesman did mention that after a couple years I would have to recalibrate or realign something inside the TV. Does anybody know how to fix it, or where I can fix it and how much should it cost?

Thanks a lot!

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  • kdixon34 Feb 08, 2008

    I have the same problem only it just happened one day out of nowhere.

  • Yulishna Feb 15, 2008

    I have a Toshiba 42H81 and I have the same problem, I've found the parts I need, but I don't know where to put them in the tv. Can you help me?

    Thank-you,
    Yuliya

  • tryntrust Feb 29, 2008

    My Toshiba 42H81 also have convergency problem, the red color has separated with both vertical and horizonal curve. Using one-touch-focus won't work.



    After reading solutions here and self-check the STK area, I found one resistor blown (R7711, 1W 1.8 ohm), and one bad PICO fuse F853 (125V, 1.25A). Don't know if the STK392-110 is OK or not, someone suggests that if resistor is burned-out, it must be caused by a failed STK IC.



    I know many online company sales STK392-110, but I have hard time to find the resistor and pico fuse. Where do your guys get the parts from?

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I am working on the exact same problem with the same symptoms. Make sure the tv is unplgged for at least 5 minutes before poking around. The power cord can be unplugged from the power board and removed to keep anyone from plugging it in while you are working on it.
The STK's are the large 18 pin integrated circuits (chips) mounted to the large heat sink on the convergence board. This is the board on the right when viewed from the back of the TV.
The resistors are beneath the heat sink on the left side of the board. There are also fusible resistors, like #7711, on that side. There are NO pico fuses in this area.
Fuse 853 is on the Power board. This is the board on the left when viewed from the back of the TV. You can remove both boards in the carrier by carefully unplugging all connectors, noting their locations and routing.
To remove the high voltage wires from the splitter, mark them for position then grasp the boot and turn counter-clockwise about 10 degrees to unlock them and then pull up while holding the High voltage splitter. The small high voltage wire can be removed from the flyback transformer by pulling hard while holding the flyback.
STK392-110 can be replaced with STK392-120, STK392-180, STK394-160.
I have found most of the parts at newark.com. Also check out this site for some very good info: http://www.hometheatershack.com/forums/diy-repair-maintenance/5600-crt-based-rptv-convergence-repairs.html
btw: I am not affiliated in any way.
Make sure that while you have the boards out you look for any bad solder connections. A lot of problems arise or return because of this.
I hope this helps, I have been doing a lot of searching to get this info and hope it helps you. Too many people want to trickle the info and pretend they are giving you gold. A few hobbyists or people that can't afford to pay $300+ for repairs are not going to hurt their business.
Be safe and share knowlege freely!

Posted on Mar 02, 2010

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  • 9 Answers

1 - The Unit needs 2 ( STK-392-110 or Higher Voltage STK-392-160)
2- Also check the Resistors or Pico Fuses around the STK.


DJ
with
AAPCO Electronics Austin Texas

Posted on Feb 02, 2008

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