Re: I have an RCA model 20F512T and the screen is tinted...
Maybe you should check your picture settings from the menu button, it should be a "slider" from red to green, and your preference somewhere near the middle.
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The projection TV has 3 guns RED GREEN BLUE. In your case the red and the blue guns are gone. So you are getting the green color screen. You got to replace the picture tube.
a green screen on power up with retrace lines. At shut down a point appears in the middle of the screen.
Sounds like either a shorted G2 grid, or bad flyback. If a phospher flake has shorted the grid in the tube, you can sometimes have luck by using a megger set at 1000VDC, to burn away the short.
This is usually caused by the line HV going too high causing the anti-UV protection to kick in so fit a dummy load 40W lamp instead to the line output to allow measurements to be made.
Turn down your color and see if the screen has a normal black & white screen. If it doesn't then the CRT is bad (picture tube). If it is black & White then you have a either lost your red or blue.That problem will be in your video driver circuit of which a service center can handle.
using a dmm check the resistors on the kine board. the small board on the back of the picture tube. you sould find an open resistor. if i remember correctly, if looking at the back it would be on the bottom of the board & about 180k ohm. if you have a difficult time finding it, look for the same type/color of parts on the small board to make comparrisons. between parts. you sould have 3 of most parts, one for each color.
good luck.
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