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Post by gjaky on May 29, 2016 8:45:38 GMT -5
In the meantime I found the problem for the lack of vertical blanking. So now all three boards are working in the XG now, currently I run them to see if they last (green runs pretty hot), laer the day when it gets darker (4 PM here now) I'll try to make a real setup to see if I'm able to dial in the colors.
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Post by gjaky on May 29, 2016 12:55:45 GMT -5
I could set the colors! It involved a bit of messing in the reference menu though, but only with the light-weight settings. I ran off with the G2 setting (I could not set it low enough) so I had to decrease "Bright bias".  |
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Post by Casethecorvetteman on May 29, 2016 21:30:39 GMT -5
So is it operating pretty near as it should?
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Post by gjaky on May 30, 2016 0:19:16 GMT -5
Yes!
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Post by Casethecorvetteman on May 30, 2016 1:33:34 GMT -5
Better image at all?
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Post by gjaky on May 30, 2016 10:04:48 GMT -5
Can't say anything yet, as the projector now need a full setup. EDIT: So I made a fairly nice setup and watched a few clips. -In terms of detail and sharpness the difference is very little -if any. -I don't know if it is because I messed in the reference menu or the neckboards doing themselves but now I could get a much better shade detail. Prior I had to push gamma on the computer around 1.2 or more, now I could settle with default 1.0 gamma yet with good response. Well, If I'd know if the result will be like this probably I'd not start this. Don't get me wrong, I'm not desperate, since the goal was to achieve better bandwidth than on stock boards, and it was made by wide margin. That is an other question how the effect of this better bandwidth compares to all the efforts I made to do this, note this project took me more than 2 years to finish! Anyway, I have enough parts to do two more set of these (not counting the VNB, but you can find that on every corner) so if anyone else wants a copy I'm in  |
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Post by Casethecorvetteman on May 31, 2016 4:57:56 GMT -5
What are the chances you could get yokes from a 9" to work in the XG?
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Post by gjaky on May 31, 2016 5:34:35 GMT -5
The deal breaker could be the deflection coil, and the choice is not very big, you can either use the Barco 120x yokes or the Marquee yokes, as these are the only ones with splitted horizontal windings. I don't know anything about the barco yokes but I have some data on the Marquee, I'll do some "what if" calculations.
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Post by Casethecorvetteman on May 31, 2016 6:01:16 GMT -5
Id be interested to see the XG push out an image from P19s, i have a full set of housings and lenses as well as a spare 909 chassis to mount them all in, its just the yokes that make it hard to do.
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Post by gjaky on Jun 4, 2016 9:58:10 GMT -5
The XG1100 boards arrived from jenum a while ago, but I did not hav much time to try them until now. As a foreword I have to say I'm quite amazed by the performance of these old XG boards. In theory it's not much different from the PG xtra board which had a its limitation around 1080p 60Hz in terms of bandwidth. Now as it seems these boards hold up to 1080p 72Hz well, which is very good from a stock projector! 1080P 72Hz  1080P 85Hz 
As for the XG-VNB boards, they already have about 3hrs in them but they still hold up lol  Although the red and probably the green has some issue with the AKB, but as always I have an idea where the problem could be, this is a rather small issue however. |
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Post by gjaky on Jun 6, 2016 23:14:21 GMT -5
Well after about 5 hrs of service the neckboards already acting up. The green tube became intermittent and in the same time random dots appear on the screen and all this is somewhat screen content dependent so it comes and goes as it please. There is no AKB line on green either when its blank, which would indicate false "spot kill" or something around the contrast controll or it even can be the clamping, but the random dots are still there which on the other hand indicate an oscillation from the +/-85V supply which I had earlier.
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Post by gjaky on Jun 8, 2016 0:32:35 GMT -5
I found this problem to be mechanical related, as squeezing the board on the tube neck could make the problem disappear. Looking at more closely turned out the tube socket converter had some instability and I suspect the G2 intermittently was shorted to the filament, which sounds dangerous, but fortunately the G2 was already bypassed with a 330k resistior there, so nothing catastrophic happened. I have to reinstall the board to verify though.
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Post by Casethecorvetteman on Jun 9, 2016 0:17:05 GMT -5
Lucky  |
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Post by gjaky on Jun 9, 2016 0:25:30 GMT -5
Yesterday I put back the repaired neckboard, and also found why the AKB was somewhat dependent off screen content, so I cured that too on all three boards, after that I did not have much time to play with it, but at first glance it seems all the remaining problems went away as well.
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Post by gjaky on Apr 9, 2017 13:11:22 GMT -5
I just recently sold my XG-135LC and the deal not included XG-VNBs, so they are now officially decommissioned. Since there is no market for it I'll probably revert back the VNBs to the Marquee and perhaps reuse the AD834s in my own ULTIMATE VNB-DB. Here is a picture for the Archive about a finalized board.  |
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Although the red and probably the green has some issue with the AKB, but as always I have an idea where the problem could be, this is a rather small issue however.
