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Do you have speakers next to your tv sometimes the line on your tv will be from your sound to close to your tv also the red line could mean your tv tube is going out there about 300 to replace but i ould check frist on your sound are something close to you tv that is maken the red line in the middle of your tv
Off hand I would con dim the Red and Blue CRT"s. If you were to replace two of them I would also do the Green CRT as well. The cost of just doing two of them is way too expensive in my opinion and you would be better served to replace the set instead of investing the amount of money needed in a 6-8 yr. old set.
Hope this helps,
If the screen looks like the one in the link I posted, then you might want to try fixing it with what is suggested on the site. Keep in mind that this is a band aid fix which compensates for weakening components, however it "should" buy you some time. Don't do these adjustments if this is not the same problem you are having. If the TV shuts itself down, check to see if the blinking code is the same as the one in the web site.
This 3-D problem is because to failure of convergence out ICs failure in TV and convergence ICs will be replaced. If TV is Sony KP-51WS500 then check D board for STK392-560 and replace 02 ICs. Required parts are available in Part Store.
This sounds like a typical problem related to a older CRT.
If you remove the front cover of the tv, you can then remove a wood panel. Behind this panel you will see a block (high voltage splitter) it will have 6 "knobs" on it, 3 will say focus, 3 will say screen.
They will also be labeled R - G - B
Put the tv on a blank input so you can see the lines clearly on a black screen - Find the knob for red, and SLIGHTLY turn it down until the red lines disappear.