Picture is very dark, all color signals are there, pix and sound are fine, tried adjusting brightness, some improvement but still not good pix, i hear a cap whistling faintly but cannot locate, im working without a schematic, so tracing luminance signal is a bit hairy, just wondering if anyone has ran across this problem and can offer a quick fix.
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Re: low or no luminance
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, dark, etc. You may even see halos around images.
What you will need to do is replace the coolant and clean the crt. You can get a repair kit from www.TvRepairKits.com that includes replacement coolant, photos. instructions, etc.
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Rca Screen ControlThese sets have screen control adjustment usually located behind the speaker grill(pops off -velcro or press tabs) and convergence front board. There are 6 contols on a black molded assembly about 31/2"x21/2" square. adjust only the top controls marked "Screen R G B" the bottom ones are focus Method: -turn on set and let warm up for 30 min at least -switch tv to blank unused video input channel -adjust each control in turn until you see the picture glow (with the corresponding color) and slightly back off the control - repeat for each color - this will increase screen brightness and ballance your color Hope this helped.
They should be adjusted to set voltages. however it is best to shut the color level to the lowest setting then try t balance the screens to achieve the best black and white picture. then turn up your color level. Your brightness level should also be set to 50 % then when you adjust for the best B&W picture. You will have better color and brightness when you reset your color and brightness levels. Hope this helps.
Open up the front of the set and find the screen controls and perform a grey scal alighnment by adjusting the red , blue , and green screen controls but be carefull and make sure you adjust them evenly or the picture will not look right. Good Luck