JVC DLA-HD250 new entry level DILA - Page 63 - AVS Forum | Home Theater Discussions And Reviews
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post #1861 of 1868 Old 03-14-2015, 12:23 PM
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Originally Posted by turbo50jeff View Post
I have the opportunity to purchase a refurb JVC250 for $1399 or a preowned 8700ub with only 73 hours on it for $1000. I watch only in a completely dark TREATED room and only movies on Bluray. 100-110" screen. Which projector would be the better one?
I'm considering selling my HD250. I'd let it go for $1000 and it comes with an extra bulb still new in the box.

JVC HD 250
Benq 1070
B&W
Onkyo
Hsu Research
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post #1862 of 1868 Old 01-30-2016, 01:14 PM
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Vertical Shift Question

Apologies if this has already been covered, but the search tool for this forum didn't work too well for me.

I have an HD250 mounted on a shelf on the back wall of my theater room. The projector is 18' away from the screen, and is
mounted right-side up with the center of the lens 1 foot below the ceiling. The problem is the top of the image is also 1 foot below
the ceiling, and I cannot shift it any lower with vertical shift. The vertical shift can shift the image up (and onto the ceiling) pretty far,
but does not shift any lower on the screen. Any ideas on how to solve this?
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post #1863 of 1868 Old 01-30-2016, 05:11 PM
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Originally Posted by jaidog View Post
Apologies if this has already been covered, but the search tool for this forum didn't work too well for me.

I have an HD250 mounted on a shelf on the back wall of my theater room. The projector is 18' away from the screen, and is
mounted right-side up with the center of the lens 1 foot below the ceiling. The problem is the top of the image is also 1 foot below
the ceiling, and I cannot shift it any lower with vertical shift. The vertical shift can shift the image up (and onto the ceiling) pretty far,
but does not shift any lower on the screen. Any ideas on how to solve this?
Buy a ceiling mount and mount it just above the shelf. This will flip the projector upside down and you should then have enough lens shift to alighn the picture properly.

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post #1864 of 1868 Old 01-30-2016, 06:06 PM
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Originally Posted by JackB View Post
Buy a ceiling mount and mount it just above the shelf. This will flip the projector upside down and you should then have enough lens shift to alighn the picture properly.
Was hoping to avoid doing this. Shouldn't the shift be the same in the vertical up direction as the vertical down direction? Although flipping it seems like it would do the trick, I am confused as to why?
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post #1865 of 1868 Old 01-30-2016, 06:41 PM
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Originally Posted by jaidog View Post
Was hoping to avoid doing this. Shouldn't the shift be the same in the vertical up direction as the vertical down direction? Although flipping it seems like it would do the trick, I am confused as to why?
Projectors are designed to beam the image up. So the shift is the same, but it's not starting from a position center and level with the lens.
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post #1866 of 1868 Old 01-30-2016, 08:06 PM
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Originally Posted by Verge2 View Post
Projectors are designed to beam the image up. So the shift is the same, but it's not starting from a position center and level with the lens.
When you say "beam the image up", I presume you mean when the projector is mounted right-side up. So, the starting point or center is actually already high?
I think I understand what you mean, but the following diagram implies that the shift up or down should be the same amount and doesn't state that the
center is already up:

http://www.complete-it.ca/pdfs/proje...A-HD250PRO.pdf

The other peculiar thing is that I don't think I had this issue before I repositioned the projector. Previously, it was on a shelf about a foot lower than the
new location, and I was able to get the image as low as I wanted. In the new location, I can no longer do so. I'm wondering if the mechanism for shifting
got messed up when I moved the projector. I just played around with it some more and no matter how I try to shift the screen, I cannot get the top of the
screen to be any lower than the lens position. The diagrams in the owner's manual show that I should be able to do so.
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post #1867 of 1868 Old 01-31-2016, 07:08 AM
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Holy crap you're right, the lens shift mechanism must be faulty. It should shift well below the projector like you said.
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post #1868 of 1868 Old 01-31-2016, 01:07 PM
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Quote:
Originally Posted by Verge2 View Post
Holy crap you're right, the lens shift mechanism must be faulty. It should shift well below the projector like you said.
Any ideas on how to troubleshoot/fix the mechanism?
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