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Picture's gone--sounds fine!

I have an older 27 " Toshiba T.V....it has given us no problems, but just yesterday, all of a sudden the picture was gone...the sound was still there, but there was just one horizontal line going through the middle of the screen. I'd like to repair it myself if at all possible. I'm thinking it might be the picture tube??? If so, where do I get the instructions to fix it?

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  • Tracy Bedard Apr 19, 2009

    Thank you VERY much for taking the time to answer my question! Appreciate it very much....I'll check into the solutions you gave!

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This is very likely not the picture tube. I suspect that something in the vertical oscillator section has gone bad. You will need to get the schematics for this set. Locate the vertical section and look at the transistors and IC's to see if they are still good. Also check for bad solder joints and open resistors. You can do all the checking with a simple Digital Volt Meter. You can get all the info you need online for how to test transistors, diodes, electrolytic capacitors and resistors. Most of my TV fixes have involved bad solder joints that have gone bad after years of hot/cold cycles , usually under a component that gets hot (heat sync) , resistor, or heavy item such as a transformer. The other issues are usually with transistors or IC's that have gone bad due to power surges or age degradation. Sometimes fuseable resistors open open. Sorry I can't be more specific. There are too many things to check. Could also be a power supply issue. but highly unlikely if you still have a center line. TV tubes hardly ever go bad unless the set is very old.

Posted on Apr 19, 2009

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