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Brooklyn
Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA
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| Posted: Tue Jan 08, 2008 6:35 am Post subject: NEC PG bottom focus |
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Hello, I am having a hard time getting the bottom of the image of my NEC PG to focus properly. The top and side are pretty well focused, but the bottom is not. I tried using the edge focusing option, but it can only barely make the bottom focus better. I have also tried focusing the lenses too. This occurs on all 3 colors. Any ideas what I am missing? 
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Jesse S
Joined: 12 May 2007
Posts: 209
Location: Etobicoke
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| Posted: Tue Jan 08, 2008 7:22 am Post subject: |
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Probably Scheimpflug, which you can't really adjust on NEC's. See if the spacers (between lenses and tubes) are set to the right numbers. The chart is in the setup manual.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Tue Jan 08, 2008 12:14 pm Post subject: |
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If it's a plain PG it doesn't have flapping.
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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: Tue Jan 08, 2008 2:00 pm Post subject: |
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If the electronic focus does nothing, I'll bet the F board is bad.
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dbaisey
Joined: 09 Mar 2006
Posts: 821
Location: Southern Cal LA / Seattle WA
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| Posted: Tue Jan 08, 2008 2:01 pm Post subject: |
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What exact model?
Depending on the model number if it isn't a 'plain' PG it could be the bottom edge elect astig isn't adjusted right or you have the image not centered in the tube face top to bottom. If it is and it still doesn't focus check the A-B focus ring tabs and try small changes. Just do on the green first.
You want the image hitting the convex-concave sweet spot of the lenses or you can have a soft top or bottom edge. Could be where you have the screen also depending if the projector is level. See diag in the install manual. Doug
When using 16:9 format the top bottom focus might appear its not doing much. Easier to see on a 4:3 image.
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Brooklyn
Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA
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| Posted: Thu Jan 10, 2008 7:30 am Post subject: |
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Messing with the spacers fixed the problem. I had to set it to the 11 degree incline option even though I dont have the projector at an incline.
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kschmit2
Joined: 09 Mar 2006
Posts: 1141
Location: Heidelberg, Germany
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| Posted: Thu Jan 10, 2008 8:38 am Post subject: |
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11 degree is the standard setting for ceiling front when the PJ is mounted level to the ceiling.
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