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To increase the life of a picture tube reduce the filament voltage slightly by connecting a 2 watt wire wound resistor in series with the filament supply. The value of the resistor should be chosen experimentally connecting 1 ohm to 4.7 ohms so as to get a fair bright picture. Though startup delay will be there,the color, contrast and clarity of the tube will last double than the normal. I am using a TV for more than 12 years and still the picture clarity is as comparable with a new TV.
A lot of people don't realize that backlight settings can affect the picture.
Go to the menu (press menu on your remote)
The menu will show picture options. Just toy with different settings until you find what you want. It may be on a preset setting that doesn't work. If you are in a bright room, you will need to increase brightness and contrast and perhaps backlight.
Usually an unclear picture is due to the contrast, backlight, and brightness settings being too low. You can also increase sharpness.
I suggest a contrast setting of 70, a brightness setting of 60-80, and a backlight setting of above 80.
Contrast = 60 to 80%. Brightness = 40 to 55% Color = according to personal viewing taste. Sharpness = 15 to 20% The best way to tune to a perfect picture is, set the color to Zero first. Without any colour, increase the contrast to at about 65%. Adjust the brightness to get a perfect picture in B/W. Then increase the color, according to your viewing taste. Compare the skin tone of a person. That's all.
Ur tv is a DLP projection tv?Yes,the tv projection lamp is dying,sould be replaced.If this is a LCD or Plasma tvs is notthing u can do,as the tv getting older the screen brightness will get dimmer and dimer as tv ages,only thing u can do is to go into the Menu goto PICTURE SETTING.Go go down to Brightness increase it and the Contrast increase it too.
when you dim a light it increases the resistance,when you increase resistance it causes heat, the more watts you are trying to dim the more heat you create, heat will cause anything to break down, so add up all your light bulbs and make sure your dimmer can handle that many watts, use lower wattage bulbs and maybe a higher wattage dimmer
Check the lamp timer to see how many hours are on it. If is is near the estimated end of life for your TV replace the lamp. It will get dimmer as it approaches its end of life. The lamp timer should be in your menu.
Does not seem like a bad tube alone. Could also be that the Video output Transistors Supply Filter capacitor having dried out. It is a 100mfd 160V capacitor, which on replacement will improve the brightness of the immage. And yes, you could also try increasing the heater voltage (Filament Voltage)of the Pictuire tube, this will definitely increase brightness, but will reduce the life of the Picture tube.
You gotta think - 10 year old TV, should I repair or exchange and get a new one???