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anthonywong123
Joined: 26 Feb 2014
Posts: 35
Location: chengdu,China
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| Posted: Wed Feb 26, 2014 2:00 am Post subject: left side horizontal linearity problem with barco 1209/2 |
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I got a barco 1209/2 9 inch projector, it is so great that can deliver fantastic picture qulity, it also can do 3D with help from 3Dfury and panasonic BDT-300 palyer.it's bright enough to show 3D image while I use dalite screen(2.8 gain)
I am satisfied with it except on thing, that 1209/2 got left side horizontal linearity problem.
What I mean is red and blue can not converge perfect with green in left side,the red is either in left or right positon can not match the green line especial in high scan rate such as 60hz or 72hz.
I can see the barco has vertial liearily adjustment function but no horizontal adjustment in menu.
What ca I do? is there any way to adjust horizontal liearity on red and blue?
thanks.
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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: Wed Feb 26, 2014 2:05 am Post subject: |
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This is pretty common, even with newer Barcos. The cheapest/easiest way to solve this is to get yourself a scaler to shrink the image on the tube raster, so that you're not needing the far outside edges where the convergence is off. A good used scaler like a Lumagen will run about $250 USD. Shrink the image on the raster, then widen out the image to use the full tube face.
I've even seen some later 1209s sets do it. It's been a while since I've worked on one, but never did get to the bottom of why the extreme edge (usually the left side) is out of convergence.
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anthonywong123
Joined: 26 Feb 2014
Posts: 35
Location: chengdu,China
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| Posted: Wed Feb 26, 2014 2:30 am Post subject: |
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| Curt Palme wrote: | This is pretty common, even with newer Barcos. The cheapest/easiest way to solve this is to get yourself a scaler to shrink the image on the tube raster, so that you're not needing the far outside edges where the convergence is off. A good used scaler like a Lumagen will run about $250 USD. Shrink the image on the raster, then widen out the image to use the full tube face.
I've even seen some later 1209s sets do it. It's been a while since I've worked on one, but never did get to the bottom of why the extreme edge (usually the left side) is out of convergence. |
thanks for your quick reply, curt.
So that is very common things on barco 1209 model.
I will think about a scaler and hope it can passt 720p/120hz signal when I wahtch 3D movie.
thanks.
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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: Wed Feb 26, 2014 2:37 am Post subject: |
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Check the specs of the scaler before you buy. I'm more of a projector PC board repair guy as compared to someone that sets up full installations, so maybe another forum member can recommend a scaler that will do what you want?
Guys?
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anthonywong123
Joined: 26 Feb 2014
Posts: 35
Location: chengdu,China
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| Posted: Wed Feb 26, 2014 2:50 am Post subject: |
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| Curt Palme wrote: | Check the specs of the scaler before you buy. I'm more of a projector PC board repair guy as compared to someone that sets up full installations, so maybe another forum member can recommend a scaler that will do what you want?
Guys? |
so except buying a scaler, do some adjutment on Horizon output board is useless?
there is no some trimpot on barco 1209's borad to adjust horizontal linearity?
if it is fact, either buy a scaler or do not use the far left edge.
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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: Wed Feb 26, 2014 3:05 am Post subject: |
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There's been some discussion here, but basically that's correct.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Wed Feb 26, 2014 11:08 am Post subject: |
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I guess your main problem is that your sources timings are designed for digital projector. For example back porch is way too small for analog projector. Electron beam needs bit time (blank pixels) to stabilize before actual picture start.
You can check this by elevating brightness to 80 and lowering contrast to 20, then remove blankings from sides and look in tubes face if there is any unused raster before and after actual picture. With 1080i/p there need to be least 1/2" blank raster at left edge before actual picture start. If there is any unused raster, move that all to left using projectors Hphase.
Then compensate picture movement with raster sift.
That is where you need scaler, to alter picture timings. Mostly making horizontal back porch bigger.
There is few adjustments for horizontal linearity but those affect mostly to whole picture width.
Running projector in high freq mode could help little with small timings. Turn P64 pot with 1080p signal until green high scan mode led are lit at horizontal boards daughter board. High/low scanning mode chances deflection yokes configuration between series and parallel. High is more suitable for higher resolutions like 1080p.
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anthonywong123
Joined: 26 Feb 2014
Posts: 35
Location: chengdu,China
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| Posted: Thu Feb 27, 2014 1:51 am Post subject: |
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| Ile wrote: | I guess your main problem is that your sources timings are designed for digital projector. For example back porch is way too small for analog projector. Electron beam needs bit time (blank pixels) to stabilize before actual picture start.
You can check this by elevating brightness to 80 and lowering contrast to 20, then remove blankings from sides and look in tubes face if there is any unused raster before and after actual picture. With 1080i/p there need to be least 1/2" blank raster at left edge before actual picture start. If there is any unused raster, move that all to left using projectors Hphase.
Then compensate picture movement with raster sift.
That is where you need scaler, to alter picture timings. Mostly making horizontal back porch bigger.
There is few adjustments for horizontal linearity but those affect mostly to whole picture width.
Running projector in high freq mode could help little with small timings. Turn P64 pot with 1080p signal until green high scan mode led are lit at horizontal boards daughter board. High/low scanning mode chances deflection yokes configuration between series and parallel. High is more suitable for higher resolutions like 1080p. |
many thaks,Ile.
I will do as your suggestion.
actually 1080i is pretty much better than 1080p in left side convergency, the vertical transparent damping stripe in far left side maybe also affect convergency,it is more visible in high scan rate than lower.
First I will adjust P64 to the high scan mode.
thanks.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Feb 27, 2014 8:09 am Post subject: |
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| anthonywong123 wrote: | | the vertical transparent damping stripe in far left side maybe also affect convergency,it is more visible in high scan rate than lower. |
This "raster ringing" is actually kind of wavyness at beginning of the scan and is also related to too small timings.
Bigger resolutions need more time to stabilize, so also porches need to be bigger.
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