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Post by Decibel on Aug 14, 2015 14:15:19 GMT -5
Usually not!
I saw that Cinemax have an option for exclude convergence of green. I disabled this feature.
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Post by mastertech on Aug 14, 2015 15:36:34 GMT -5
Usually not! I saw that Cinemax have an option for exclude convergence of green. I disabled this feature. How about disconnecting the green convergence coil then? See if it makes a difference in the SR2 temp. |
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Post by Decibel on Aug 15, 2015 5:00:37 GMT -5
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Post by Deleted on Aug 15, 2015 5:10:53 GMT -5
Yeah I have had that but that describes an unstable convergence. Do you meen with noise on the blue tube that the convergence grid is moving or distorted? I was thinking that you ment video noise.
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Post by Decibel on Aug 15, 2015 5:58:14 GMT -5
The grid is not distorted but moving (flicker).
All tubes but especially blue.
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Post by Deleted on Aug 15, 2015 7:28:19 GMT -5
The grid is not distorted but moving (flicker). All tubes but especially blue. Did you null all astig settings and focus settings? Did you throw away all memories? |
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Post by Decibel on Aug 15, 2015 8:16:22 GMT -5
The grid is not distorted but moving (flicker). All tubes but especially blue. Did you null all astig settings and focus settings? Did you throw away all memories? All neutral. |
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Post by mastertech on Aug 15, 2015 8:53:47 GMT -5
Did you check the resistors on your convergence board?
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Post by Deleted on Aug 15, 2015 9:00:28 GMT -5
Does the image also move when the convergence is 0 or the convergence coils are disconnected?
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Post by Decibel on Aug 15, 2015 9:00:51 GMT -5
Did you check the resistors on your convergence board? No Mastertech. I'm not in home and still no try to disconnect green convergence coil as you asked. |
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Post by Decibel on Aug 15, 2015 14:23:50 GMT -5
I think I just made the definitive test.
I disconnected one by one the connectors of convergence coils.
The tube relative (connector disconnected) showed a picture super stable, no flickering.
At last I removed the jumpers from convergence boards and the flicker is gone off from all three tubes.
So the problem that causes the flicker is certainly in a section of convergence board.
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Post by Casethecorvetteman on Aug 15, 2015 17:27:23 GMT -5
Tell me, does your quad buzz or squeal with changes in brightness??
Mine did that and i had the grid lines moving all over the place, without seeing yours i dont know if it is simular or not.
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Post by Casethecorvetteman on Aug 15, 2015 17:50:36 GMT -5
Well I guess you are reading to test it out. Just remember, adjusting the convergence is the last thing you want to do to move the grid around. try to get all manual settings as close as you possibly can, then do the same with geometry and lastly with convergence, hopefully using as little of adjustment as possible. When trying to match up outer lines see if linearity, outer bow or pin or what ever will get it closer before going into convergence. The convergence section is one of the most straining sections in a projector. Using as little as possible is very beneficial. Problem with the Barco geometry and convergence is its like doing an NEC but only using point convergence. The red and blue have only two options, coarse and fine. The whole lot is done the same as point convergence on the NECs, but fine adjust is still way too coarse. Its crude, its inaccurate, and its got nothing on the NECs. Moving the coarse convergence in the middle is the same as going to raster shift. It takes a lot of work to get it even close to perfect, even when you adjust every manual setting perfectly! There are manual settings in a number of places through the set, and these analog adjustments are probably the cause of the warmup drift that you just dont see with an NEC. |
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Post by Deleted on Aug 15, 2015 18:27:02 GMT -5
I think I just made the definitive test. I disconnected one by one the connectors of convergence coils. The tube relative (connector disconnected) showed a picture super stable, no flickering. At last I removed the jumpers from convergence boards and the flicker is gone off from all three tubes. So the problem that causes the flicker is certainly in a section of convergence board. I think the powerrail of the convergence board is not stable. We have to go further with the tests Mastertech started. It is all three colours so probable the common powerrail. One thing I noticed when working on my convergence board is that blue is the worst cooled because it is the first part after the power and not completely covered with cool ribs. Personally I would start testing components by soldering them out. |
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Post by Decibel on Aug 15, 2015 18:54:32 GMT -5
Redfox ... can you check the revision of your Convergence board?
There are three revisions (named "index" in service manual).
The latest is Index 3 and it's upgraded.
The bulletin that I posted suggests to replace the 8 SMD resistors of blue line in boards Index 2 or lower.
I compared the partlist of the latest revision (Index 3) and I noticed that ALL resistors of ALL colours was upgraded.
So 24 SMD resistors of latest revision was upgraded.
There are also 6 caps upgraded with different values.
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