Dark shadow in the middle of the screen.

Return it. It is defective

If it is a dark green shadow it can be the lamp in need of replacement.

Ok I guess you have an optical mirror chamber error sounds good doesnt it but can happen if projector has been knocked or dropped in the optical engine there is a chamber connected in between the main lamp and internal glass lens you may see it if you look inside the lamp assembly this very small chamber has four very small mirrors in it and is held in place usually by a metal plate bracket you may find one of the mirrors has moved or dropped this makes the refraction of light incorrect which will cause your dark shadow on your image screen

problem on high voltage .some of components are go to bad ,so replace this damage part quickly by authorized service center.

No,you might just need to Clean Mirror and Top of all 3 Tube Lenses, this Set does not have Lamp ,it has 3 Picture Tubes RED/Green/Blue. You might also need to adjust the screen drive Controls to each Tube.

the cold cathode lamp of your tv is nearly to be busted and needs replacement..tnx

did the lamp explode before you changed it ?

no power, but regulator is ok

Good Day;
You may have a lamp going bad,when was the last time you replaced it? Or the DMD or light engine, try lamp first. Good Luck, big IRISH.