Maybe the color killer in the remote control is activated. Try disabling it. Now if nothing happens even if you adjust the color using the remote, the color demodulator maybe is at fault. The three primary colors is derived from this IC component and then amplified through the transistor color amplifiers, one for the red, green and blue. Try checking also the video driver transistor in which the three color amplifiers are connected. This might also a good suspect.
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The tubes have aged and the colour balance between the tubes has shifted. You will need to redo it using a black/white test image: first the black (the cutoff point), then the white (the gain) on each tube - always start with the green colour. This is done on the final video amplifier of each tube by adjusting the corresponding semiadjustable resistors.
This could be a problem in the vertical sweep circuit, as when the vertical circuit fails, The video or screen will blank out so the picture tubes do not get damaged. In this chassis, I have seen the convergence IC's cause this, or the capacitor in the sweep power supply that feeds the voltage to the vertical IC has failed and blew out the vertical output IC. If you have no solid state repair experience, play it safe and call in a trained tech to assist you in this repair. Good Luck.
The easiest way I have found to set the screen controls is to tune into an old black and white show, turn the green up until you see retrace then slowly turn it down until it just dissapears then adjust the blue and red for a true black and white picture.
Using the rf could cause that to go to black and white if there is interference on you don't have it turned to the correct channel. Your rf should be set for 2, 3, or 4 depending on what the choices are on the rf box. Can you plug the yellow, white, and red cables directly into the tv and use a video input on the tv to see it?
go into menu turn color off see if you have a black and white picture if not adjust red,green, and blue screen drive on controls in back of tv you have red, green, blue it will have focus /screen controls cover each tube do one at a time blue focus and screen drive adjust to clear blue picture do all 3 tubes, then adjust them to where you have a black&white picture once this is done turn color controll back on.Thank You for using FixYa and Have a Nice Day.