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This time I didn't do anything in the servicemenu! 
My Hitachi CP-X275W has a stuck pixel right in the middle of the picture which appears after 10 minutes of use when the projector has warmed up. It's extremely annoying in dark movies when the blue dot suddenly appears in the middle of the picture. I have experimented with getting rid of it before by applying a small dot of some dull black tape on the screen where the pixel would be, but this created a black hole in black scenes (dark grey scenes
) and an even more noticeable black spot in bright scenes. I dismissed the idea then not bothering to try a yellow piece of tape that I thought would work.
Now, after having gotten rid of the vertical banding and the color uniformity problem in the service-menu, I realized that the only thing that was wrong with the picture was the stuck blue pixel. I decided to give the experiment with the yellow tape a go.
I didn't have any yellow tape lying around so I had to improvise. I found a plastic bag with a sticker which had some yellow in it. I peeled the sticker off carefully to preserve the glue on the back and cut a little square out and stuck it to the screen. I could still see some blue on the piece of tape when I stood right in front of it, but when I sat down in the sweetspot it was totally gone! WOW!!! This is too god to be true I thought so I switched to a completely white screen. WOW!!!
There's no spot there! I expected a grey spot there now.
In my excitement I inserted movie after movie in the DVD-player and not even once could I see anything wrong where the stuck pixel was (is). The only time I see a spot there is if I walk close to the screen when a blue picture is projected. I guess the tape is stopping too much blue light from being reflected. But it's not visible from the seats. I'm VERY satisfied with myself now.
I tried taking a closeup picture of the spot with and without the tape but it was very blurry and didn't come out very well. It's difficult to hold the camera steady for a closeup shot without a tripod.
Why do I always discover these things at 01.00 AM?
Tor Arne
My Hitachi CP-X275W has a stuck pixel right in the middle of the picture which appears after 10 minutes of use when the projector has warmed up. It's extremely annoying in dark movies when the blue dot suddenly appears in the middle of the picture. I have experimented with getting rid of it before by applying a small dot of some dull black tape on the screen where the pixel would be, but this created a black hole in black scenes (dark grey scenes
Now, after having gotten rid of the vertical banding and the color uniformity problem in the service-menu, I realized that the only thing that was wrong with the picture was the stuck blue pixel. I decided to give the experiment with the yellow tape a go.
I didn't have any yellow tape lying around so I had to improvise. I found a plastic bag with a sticker which had some yellow in it. I peeled the sticker off carefully to preserve the glue on the back and cut a little square out and stuck it to the screen. I could still see some blue on the piece of tape when I stood right in front of it, but when I sat down in the sweetspot it was totally gone! WOW!!! This is too god to be true I thought so I switched to a completely white screen. WOW!!!
In my excitement I inserted movie after movie in the DVD-player and not even once could I see anything wrong where the stuck pixel was (is). The only time I see a spot there is if I walk close to the screen when a blue picture is projected. I guess the tape is stopping too much blue light from being reflected. But it's not visible from the seats. I'm VERY satisfied with myself now.
I tried taking a closeup picture of the spot with and without the tape but it was very blurry and didn't come out very well. It's difficult to hold the camera steady for a closeup shot without a tripod.
Why do I always discover these things at 01.00 AM?
Tor Arne