CurtPalme.com Home Theater Forum

Francisco · Joined: 05 Apr 2007 Posts: 305 Location: The Netherlands

@wolfman, nice results Thumbs Up

How did you manage to let you acces custom resolutions beyond 1080p?
Did you override edid? I'm still struggeling to override edid so nvidia control panel won't complain about this display is not compatible for this resolution.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

As I read it, you have to uninstall the nvidia control panel as it will "fact check" your custom resolution and keep you from using it.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

I was reading up on the matter just now, and discovered my first error, for some reason I got to call my new resolution for 1440p, when it is suppose to be 21:9 1080p? I don't even know what to call it - if its even accurate to call it that. But it is a step forward and looking for trailers to download and play back on my MPDN player, because with that player you can show every little detail about the output.

Anyways, I followed your lead yesterday so there is no news I can share for you. I never use CRU anymore, I found it to be so damn difficult to use, and secondly it was sort of conflicting with Nvidia resolution center. To top it off I was using my monitor and pj hooked up at the same time, that is a big no no for me. Just the pj hooked up when setting resolutions. EDID is over my head.. never got involved in it. I just saved my resolutions, and then exported that to the preset destination that CRU shows you. Than imported it back and saved. Then restarted the computer and got the new resolution showing. No, you are better off asking the PC forums what to do and share with me and every one else interested in this. Smile

(I corrected a few errors along the way since yesterday. It might be more coming.)

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

There will be day when I just can't take it anymore, and just do it, and saw off the clamps and instead use glasfiber tape to secure the steps. I can't bring myself to do it because why mess with with something that works. I might break something good doing it.

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cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Why do you have the convergence coil on the back side of the focus coil? Actually, I think you're doing it to put the focus coil where it needs to be to work best, but your ability to converge should now be.....different.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

It was a trick to see if would work, I never had it like that before, I took a worn blue tube and went to work. The grid lines were not that off, I even tried to make it align, but the thickness went worse and worse as I went along, and in the end I had to pull the plug all together and start over as I should. Great experience though, and nerve racking.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

To make those yokes work right, you have to choose between rewinding the yoke coils to proper inductance values to rebalance the resonant circuit that is formed between the yoke inductance and the focus board driver circuit's capacitance, or rebalance it by changing certain cap and resistor values on the board.

It's probably easier to rebalance at the board.

You need to know how to calculate the values of a resonant RLC circuit, and know about the frequency band switching system in the Marquee, and know which bands you are using, and be able to recalculate the desired changes.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

Nah, that is over my head, I can solder some, but that's pretty much it. If somebody said, change this and that, and they were easy once, I could do it, but other than that, no.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

Identify the yoke types you're using. They should have a KD or KF number stamped on them somewhere.

If I have a set of the same type (I probably do) then I can measure mine and calculate the circuit changes needed.

Then I COULD tell you what to change out.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

If I can pull that off that is that would be great, thanks. I tried to open it up but is was sealed with silicon. I stumbled on that test I knew was out there, but forgot about, when I Googled the numbers.

http://www.avsforum.com/forum/16-crt-projectors/1082538-frankenyokes-questions.html

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Hi Allen, here's a copy of some info I posted from another thread
awhile ago, referring to some tests Terry and I did here on the 1292
focus coils compared to the stock units.
________________________________________________________
Found the notes from our tests last year of the stock Marquee vs.
the 1292 Focus coils. And, it turns out - we did the first run on
the 8500 down in the shop - Good Results on the 8" projector!
So, for crt_nut looking to do this on an 8" Marquee - Go for it!

Here's the results for both machines:
_________________________________________________________
Contrast ___% decrease line width 8500___% decrease 9500
-----------------------------------------------------------------
=40 ------------ 12% ----------------------- 18% -------
=50 ------------ 12% ----------------------- 26% -------
=60 ------------ 33% ----------------------- 37% -------
=70 ------------ 43% ----------------------- 33% -------
=80 ------------ 41% ----------------------- 39% -------
=90 ------------ 47% ----------------------- 48% -------
=100 ----------- N/A ----------------------- 54% -------
_________________________________________________________
-----------------------------------------------------------------

When I later moved the 1292 coils ~8mm further forward on the tube,
(by removing the conv yoke clamp and some tricky machine work), I was
able to improve the focus with the 1209 coils even more, especially out
on the sides.

ElTopo · Joined: 07 Nov 2006 Posts: 1640

Hey Marc,

that is awesome !!!

A how-to would be amazing.

cheers
ElTopo

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

KPJ17s, I have some of those. Their as-wound values are way off for a Marquee,
but I will have to pull one and read it again to get the values.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

For some reason I hope they are bad so I can gain a better image with a tune up. I much rather solder the boards involved than open them up, it seems so difficult to wound them and make it right. I don't think I can do that, but solder some boards involved I might be able to swing.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

As long as the magnetic field strength is in the ballpark for the focus yoke, it should be possible to "adjust" the focus board's
component values to create a nice harmonious match.

It's all about resonance. Basic AC electronics. Capacitance on the board balanced against inductance in the coils.

It's a series resonant circuit. Knowing the H scan frequency, and EITHER the coil inductance OR the capacitance switched into the circuit by the focus board in that frequency band, the correct inductance or capacitance can be calculated.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

This over my head I think so I must open up my wallet for this. If you want to make some money on it I need to know the figure and what parts to send you. If you want to do the job that, even if you do, I need to think it through because every Dollar spent is a Dollar lost when it comes to CRT. It's just us enthusiast's who pays up.

I might get a low hour used JVC x7000 off Ebay and missed out on one last week, and think he relisted it up from 4800 Euro to 6500 Euro. It was pulled off Ebay like 10 hours before ending claiming it was something wrong with the listing. I saved it in my storage for things I follow on Ebay, but now I start to believe the sellers can see that and how many followers they have. Or I'm paranoid.

http://www.ebay.de/itm/JVC-DLA-RS500E-X7000-D-ILA-4K-e-schift4-Projektor-3D-HD-Beamer-/311521053775?hash=item48881a0c4f:g:cmAAAOxy63FS2Rs2

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

The mod will probably cost less than a dollar in parts.

If I can figure out the values you need I'll just tell you what to get and where to put them.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

The only tool that I have is the XL830L Digital Multimeter.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

You'll only need a soldering iron and basic solder tools. The parts will cost more to mail than they'll cost you from digi-key.

Watch this space for part identification information in a day or two or three.

thewolfman · Joined: 28 Mar 2011 Posts: 1311 Location: Sweden

I'm looking forward too it. Thanks!

Francisco · Joined: 05 Apr 2007 Posts: 305 Location: The Netherlands

I managed to get the Barco lock onto 2500x800p Somehow it doesn't like interlaced, I've to figure out why.
First I had issues with my breakout cable which gave me rolling image. Now it's connected to vga on onboard video card to 5 bnc. Do you guys have some figures about porch timings you use?