Big black U in middle of screen (1 Viewer)

[chiaThomas]

I have a D56W20 RCA tv that has a big black U shape in middle of screen,about 8in from each side. The U goes from bottom to top of screen, this stays on the screen even when turned off. I have had this tv for 3yrs, been nothing but trouble with this screen...it developed green streaks less than 5 months after I bought it, had the screen cleaned made the streaks a lot worse.. The shop said screen was defected but RCA said it was not so no replacement. Anyone know what this could be? It is getting worse each day.

 

[Will_B]

Do you have unsheilded stereo speakers sitting next to each side of the set?

Can you post some pics of it?

 

[Parker Clack]

What kind of set is it? An RPTV, plasma, LCD?

 

[chiaThomas]

No I do not have speakers, and it is a RPTV. The black U stays in the same spot.

 

[David Norman]

Has it been cleaned inside recently? I wonder if something has fallen into the projection lens and you're seeing the shadow of maybe a dustball though I'm not sure if would be seen with the set turned off. Maybe a problem with the renticular screen -- warped or dirty?