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you cleaned the reflector glass, then tried to make the manual adjustment of the color to have good convergence. you can do the adjustment in the menu set up. if can not get with adjustment, their might be a problem in the convergence circuit board.a bad convergence ic or resistor.
Likely what you have is the three tubes each have a filament--not unlike a light bulb-----someone would have to trace the filament voltage (usually comes from power supply) from source to the three tubes---filament connects to each tube with two connections and is usually 6.3 volts.
If you are saying that the picture is getting darker and you have already tried to adjust the picture through the menu feature on your TV then it is more than likely the cooling fluid around the CRT tubes. Over time the fluid in these tubes gets cloudy and causes your TVs picture to become dull and distorts the color. You can google tv repair kits .com and I believe they will have a kit for your model.
It sounds to me like your bulb is going out. You have a rear projection TV, and since so, there is a bulb that shines the image onto your screen. Because of this, you need to replace the bulbs after awhile. Call customer support or look around online for a replacement bulb and directions on how to change it. Very simple, but takes a little time and effort. :D
Remove rear cardboard cover....can you see tops of red / green /
blue tubes ? Clean lens' with soft , dry cloth......Do you smoke ?
If not , replace back. Picture should now be clearer but not
necessarily brighter.......Next, remove front speaker grill and find
the RGB focus / screen adjust block....turn RGB screen controls
SLIGHTLY clockwise to achieve more brightness....not too much
or you will have retrace lines in background of picture.......Let me know after these steps are done........T.