MYoung
Joined: 24 Feb 2007
Posts: 369
Location: Madison, WI
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| Posted: Mon Jul 14, 2008 3:32 am Post subject: wear leveling a tube phosphor |
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Well, the 1252Q I recently purchased has wear on just the blue tube. I suppose with 2,800 hours on the tubes that's to be expected. Unfortunately, the wear isn't even close to being centered and the active raster wasn't using nearly as much phosphor as it could have. Part of me wants to swap in the blue tube from the 1271Q I have that has issues. On the 1271Q I have, the blue color component on it blooms like mad when turned up to a level it should be at. Maybe it's something simple that was the result of the previous owner tinkering with something they shouldn't have been? Astig? I'm not skilled or adventurous enough to fiddle with the insides while it's turned on. Swapping tubes would be a good way to find out if it's a bum tube or bum or misconfigured electronics. But again, I don't know the tube swap procedure, nor do I want to get zapped. So maybe I'll try some wear leveling on the blue tube!
If I project a full screen image of a black box with a 1 pixel wide white border, say of dimensions 1000x800 (don't want scanlines), cut off red and green tubes, take a picture of that image, project an all white 1000x800 image, take another picture of that (careful not to move the camera), then I can use a graphics program (Paint Shop Pro is my weapon of choice) to rotate the image of the box to level it, change the canvas size of the image to cut out everything but the border and its contents, resize it to occupy 1000x800 pixels, document all of the image manipulations done to that image, and perform them on the all white image (which contains the wear pattern), play with the levels on that all white image (well, actually all blue) so that the worn area turns black and the unworn area turns white, then display that 1000x800 image on the projector and let 'er cook, maybe I can level it out! I know that people on here or at least on AVS have tinkered with wear leveling. Does it work well? Has a method like what I've just explained been attempted? I know drawing boxes has been done, though it seems what I've described would take into account odd wear patterns.
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