The red crt for the set is going out, there are horizontal lines flickering back and forth through the screen near the bottom of the picture and it is getting progressively worse. Is this problem worth fixing? Or should I replace the tv?
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A flickering screen and or lines and or black bars at the top and bottom of the screen are signs that you need to replace any small electrolytic capacitors that are near the horizontal and vertical output transistors. any that are on the board on the back of the CRT and possibly capacitors in the high voltage section of the board. This is a cheap maintenance that is wise to do before any expensive parts go.
Sounds like the red picture tube could be shorting internally which would cause the "all red" condition. In which case you'd have to replace the red tube. Are there horizontal (slightly slanted) lines through the picture as well when this is happening and a very very bright screen? If so it's most likely the tube.
wow this set has several problems that cause almost the same symtoms. There is a b+ filter cap off the flyback that supplys screen drive voltage th the crt that gets leaky and gets warm when the sets on. Also theres a resistor that feeds the voltage that gets warm and a cold solder connection appears but its dosent look like a bad solder connection so just resolder it. as a matter of fact most of those largewr resistors in this set causes all sorts of complaints soI resolder most of them just to stop any problems and a friend in the tv business still told me in one case he had an intermittant crt. and x ray protection cuircut problems.. Hope this helps GOOD LUCK