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Re: TV has dark streak on one side of screen.
Your TV has a bad light tunnel. This part is inside the light engine. A qualified tech will have to replace it, but the part is available. Once it is replaced the TV will be as goog as new. Please take time to rate this solution and let me know if I can be of further assistance
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there may be dust behind the screen & also on the reflecting glass. u will see that upper back portion cover is removable. remove it & see that glass there is glass on inner side of cover. clean it, also clean the screen. u will see there are 3 picture tubes faces on bottom side, clean all of them.
if it does not work then u can increase brightness of tv by increasing "screen" control of tv which is on the lower back portion of tv. this can be done by any tv repair expert only.
the reflecting mirror is likely loose and falling down inside the light reflecting tube. you should have seen the band getting darker and larger, the small mirror is in front of the lamp and bends the light, remove the lamp and look down the tube (light path)