Question about Toshiba 42H81 42" Rear Projection Television

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Wavy picture except when displaying a 1080p image

I've had my 42H81 for 5 years. Starting two years ago the picture started getting wavy. I had a service technician come out and he replaced the digital convergence unit. The tv was fine for about six months and then it started having a wavy picture when first turned on; after about 10 minutes the picture would be fine. But it's gotten worse over time. Right now, I can view a 1080p image from my cable box attached to a color stream input without any problem. Video from all other inputs, VCR, DVD, regular cable, antena all display a wavy screen. When i set my cable box to a 480 or 720 resolution it displays a wavy screen. I went into service mode to see if I could adjust the convergence. It displays a narrow band at the bottom of the screen fine but the rest of the screen is wavy. If I go to the color stream input my cable box is on (1080p) the convergence screen is perfect. I've read the posts for wavy screens and they point to replacing the STK392-110 convergence chips and 1.8 ohm resistors.  Is replacing the STK392-110 covergence chips a solution for this problem or does the problem lie elsewhere?

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  • Anonymous Dec 13, 2007

    I have exactly the same problem. After 10-15 minutes of warm up time it goes away and is fine. You say the hyperboard needs to be replaced, how much would a repair like that typically run, and is it something I could repair myself? Im moderately skilled at fixing small electronics, but have never tried on something like a tv.

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Elsewhere! Bad hyper board =bad caps on board need replacement = find a different tech who has heard of this repair or
have him research fixya / Toshiba/ 42H81 / hyper board ......T.

Posted on Nov 23, 2007

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Posted on Jan 02, 2017

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