Question about JVC AV-27790 27" TV

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JVC AV-27790 - single horizontal line

After the set is on for a while, the picture collapses to a single horizontal line in the middle of the screen. Power down the set and immediately power it back on and the picture is back, at least for a while. Previously I have had problems with occasional thin lines across the bottom of the screen (not there for shows displayed in wide screen)and not there for on-screen menus. I wonder if the two problems are related. Have worked on tv's before but not for MANY years and was a Electronics Tech in the Navy for 20 years+, so electronics is nothing new to me. But, oh, how it has changed!!! Just need some suggestions where to start (I know, in the vertical deflection circuit!). Thanks, JimC

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  • Jim Crockett Apr 27, 2007

    Thanks for the info, this gives me a place to start.

  • Jim Crockett Jul 11, 2007

    Status report: checked diodes D421 & D422, both ok. Resoldered connections to IC421, the connector that leads to the deflection yoke, and a few other solder connections. "Rocked" S421 thinking dirt may have gotten into this open switch. Put everything back together and tested - everything works great now! None of the solder connections looked bad, so guess it pays to just reheat them all, adding a little more solder as necessary.

    Thanks for the help.

    JimC

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Since Intermitant always inspect the vert ckt for bad solder connections. If not replace the output IC they're cheap and most likely the problem If you still have lines on the top or bottom I would replace all of the electrolytic capacitors in the vert ckt also. Without much test equipment rebuilding the whole little ckt is the best way to go.

Posted on Apr 24, 2007

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