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UncleWill
Joined: 11 Dec 2012
Posts: 417
Location: Northern Virginia (outside Washington DC)
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| Posted: Mon Oct 08, 2018 3:53 am Post subject: Ehome 8500 Focus issues |
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Trying to beef up the focus on my Ehome 8500.
The focus in different parts of the screen is off (i.e. red is sharp in the top half, soft on the bottom half, green sharp on one side, softer on the other).
Went into the service menu to work on the RGB focus. Don't think it solved the issue.
Not sure what is causing this.
I think I will need to recalibrate the setup from the start. Or could this be hardware issue?
Chassis has 40K hours on it, tubes about 4K hours.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Mon Oct 08, 2018 4:43 am Post subject: |
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Have you adjusted the Scheimpflug settings? That would produce side-to-side or top-to-bottom focus errors like you're seeing.
Try turning down the contrast, then pull the lenses and look directly at the tube face. If the image is sharp on the tube face, it's an optical issue -- probably Scheimpflug.
If the image on the tube face shows the focus problem, something else is wrong.
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UncleWill
Joined: 11 Dec 2012
Posts: 417
Location: Northern Virginia (outside Washington DC)
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| Posted: Mon Oct 08, 2018 1:43 pm Post subject: |
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What are the standard focus settings in the service RGB focus menu? I've tried tweaking them and want to put them back to factory before messing the Scheimpflug settings.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Mon Oct 08, 2018 2:53 pm Post subject: |
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Set the astig and focus by putting the contrast at 100% and look into the lenses with sunglasses on. Assuming the electronics work fine, then you should be able to focus the test grid on the tube face just fine, and any lack of focus is the Scheimpflug adjustments which are covered in the manual. Don't touch the electronic and astig settings on the remote while working on the mechanical Scheimpflug settings.
That should do it.
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UncleWill
Joined: 11 Dec 2012
Posts: 417
Location: Northern Virginia (outside Washington DC)
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| Posted: Fri Oct 12, 2018 3:36 am Post subject: |
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Dang, messing up the forum postings.
I asked about this years ago.
This what I need adjusting.
From the 8500 manual.
Anyone recall the driver size and length needed to reach the bolt?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Oct 12, 2018 5:06 am Post subject: |
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"Bondhus.......James Bondhus" LOL
5/16 Allen, 9.5 inches. Cost you $30.00 mailed.
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Fri Oct 12, 2018 5:33 am Post subject: |
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I can't find mine now, but I made one from a couple of stock tool parts at Home Depot -- $15 or so if I remember right (but it's been over 10 years sooo...)
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