Question about Toshiba 56H80 56" Rear Projection Television

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Toshiba 56H80 Convergence Problem?

I have had my Toshiba 56H80 Rear Projection HDTV for quite a few years with almost no problems at all. A couple of days ago, my picture started to show blue/green shadows. These shadows are the worst in the top left, bottom left, bottom right....I tried the convergence adjustment, you can pick certain positions on the screen to fine tune the convergence....The blue + will not move in the places where the convergence is off the worse...What is the problem with the set? Any help you can give me would be greatly appreciated.....Thanks in advance....

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  • lkss Jan 20, 2008


    We have similar convergence issue that developed all at once last night on our 6 year old 56H80. I will have to ask some friends for some help with investigating the IC issue as I have tried the manual adjustment and some have bent images and some wont adjust in at all. In general I am wondering if the TV is worth fixing?

    I also have a whitish discoloration at the bottom of the screen protector that at first appeared about 2 years ago. Any ideas about how to clear that up?

    Thanks\ SS commerce Mi

  • nanskwar Mar 19, 2008

    We cannot watch any channels except high definition all other channels are distorted. Is this a convergence issue also?



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There are 2 large IC's in your set and one of them has burned out. These are called convergence output IC's and are usually the STK392-010's. A good idea would be to go ahead and replace both with the newer, upgraded STK392-150 IC's. A good tech can change those IC's in about an hour and a half, and when I do a housecall for a set like that I charge $150, but shops in your area will vary so be sure to ask around.

Posted on Sep 10, 2007

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In any projection tv and convergence problem the culprit is always its convergence ic. check also the power supplying the circuit

Posted on Sep 09, 2007


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