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If you look carefully at teh line it should be red, green, and blue close together to appear like a white line. If this is the case, then the vertical circuit has failed. This is often poor solder connections at the vertical IC or a defective IC. Expect a parts cost in the $20 range for this repair.
This issue is usually caused by some "lazy old" capacitors in the Vertical sweep section or cold solder joints. That is a large TV so it would be worth having an experienced 'old school' tv tech fix it. They can easily find the bad component using Freeze Spray that will reproduce the problem by acting as a cold start. Either way this issue will not damage anything else on your tv and may or may not get worse over time.
You have a problem in the vertical output circuit. Check for bad capacitors around the vertical output IC. The value of these caps are marked on the side of them. Thanks for using fixya. Please take a moment and rate this responce.
Three guns Red Blue and Green in the picture tube of an old CRT set. If one of the guns goes out it effects that color. Sounds like one of the guns inside of the tube is going out, To costly to replace for such an old antilog set that will have to have a convertor box next month anyway.
Problem started as a simple cold solder joint. Now the connection has either burnt to the point of not making any connection at all, or the vertical output has gone out due to the stress. As far as the dvd player goes. Sounds like the microprocessor is heating up and going bad. Nothing can be done other than replacing the whole unit.Should be able to order it from Toshiba.
Yes, for a workaround. The adapter would be 2 RCA female to 1 RCA male. You have to connect both the red and white to the female RCAs and use the male to connect to the TV's Audio INput. The yellow goes to the video. There should be no negative technical effect other than lost of stereo quality. The audio output of the DVD is line level and could normally tolerate this condition.
The correct method is to use a simple line level audio mixer and mix the L& R audio signal to produce a mono signal or to use a stereo amplifier for the sound output.
Hope this be of some help/idea. Pls post back how things turned out or should you need additional information.