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I have a Toshiba CF36H40 manufactured in 1998. There is a collapsed horizontal line in the middle of the screen. I still have sound and the line is not white.
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It sounds that the fault is with its video output section circuit. If you wish to get more details about this fault, and its rectifications, visit this site. Pull up older posts. The lines you refer here are technically called "retrace lines". Check the site. It has details.
Your problem is due to failure of the vertical scanning circuits in your TV. This is quite common and is caused by aging components. Generally drying out capacitors
You got to be careful not to leave it on too long when the picture collapses, it will burn a permanent line across the screen.
If you are an electronics expert you can fix it if you get a schematic. If not please don't attempt to reapir it yourself since there is high voltage in side the TV.
The problem may get worse with time.
If the line is VERTICAL and at the centre of the screen it is called LINE COLLAPSE, but when the line is HORIZONTAL this is called FIELD COLLAPSE.
It may be dry joints on the field/frame output IC or it may have gone open circuit. I know that the field/frame output IC's can be obtained, but if you are no good with a soldering iron then you'll have to put it in for service.
Did you mean the picture is collapsed only in the middle horizontally(white line appears on the middle part of the screen)? If that is the case, maybe vertical IC failed or loose connection.
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