Hi
This could be one of three possibilities, one the High Voltage Screen Adjustment is off, Two the Picture Tube is Weak, or Three there is a problem with the Video Drive Amp/Amps, these are things that should be checked or adjusted by a qualified technician, especially the High Voltage Screen Adjustment, hope this helps.
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how about in the menu button you can not get an adjustment in brightness control. if the display in the screen is too dark either in any channel or even watching a movie from an input source like dvd player, then i may say that the picture tube need now replacement.
This is an older set------with back off you will see 3 large black cylinders with lens---these are the red, green and blue picture tubes.
Clean the lens with a lens cloth or paper towel with glass cleaner sprayed on the towel.
Annual cleaning of them is suggested as dust or dirty lens will cut down the brightness---this happens gradually over time and will make the picture darker and somewhat dull looking.
I do it with set on but you should UNPLUG SET and just look to see if dust on lens.
It sounds that lamp in TV is weak and not throwing enough light to bright the screen for good image. How old is this TV and did you replaced its Lamp recently? If lamp has not been replaced yet or in last 2-3 years, replace it.
Your set may need to have a screen control adjustment.
This adjustment is on the high voltage transformer and the back cover will have to be removed a access it. I'm assuming that your set has a picture tube in it- not a plasma or LCD display.
If this is the case you can remove the back cover and adjust this control while observing the picture being shown. If you adjust it too high you'll get retrace lines (fine lines going accross the screen). If you're not comfortable doing this or inexperienced, you might want to get a technician to adjust it for you. There are dangerous voltages inside!
Stargazer
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