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It is possible that you have a shorted green CRT, you can remove the front speaker cover, and you will fine a focus block, and if you turn down the green screen voltage, very slowly, the green should turn down. if not then the gun (CRT) will have to be replace, If it does turn down, then go into the menu and turn the color are the way down and that should give you a black and white picture. If it is not black and white. adjust the red, blue, and green screen voltages until you receive a good black and white picture. Turn slowly they are touchy, and if turn to high, you will get retrace lines and the TV will shut down.
The color signal consists of Red, Green and Blue. Those three colors, at various degrees, make all the other colors on your screen.
If you have a BRIGHT green screen it's best you don't operate your set. If it's just tinted green then there is a problem on the CRT (Cathode Ray Tube) drive board. Do check your "tint" setting and see if someone misadjusted it. If that isn't it then you need to have your set on an electronics bench and get an estimate for repair.
is the screen dark?, if is it, see if the TRC filament is light, if is it afirmative, turn a little clockwise the fly back knob that say SCREEN and watch if there is a horizontal line at midle of the tv screen. if is it, your problem is in the vertical stage.
Green Screen with some lines
lines are called retrace lines.
it is due to
maybe dry soldered or no green drive signal. This problem can be fixed by complete soldering in crt board.
1 green video supply absent
2 loose contact in green skt in crt board
3 crt board loose
4 no green drive signal.