CurtPalme.com Home Theater Forum

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Hey guys,
Finally been able to enjoy 9500 to the fullest and actually watching movies.
Today though, I got bored because of lockdown and everything going on so decided to go thru some test patterns and settings.
I've noticed that in RGB focus, the left & right zones are pushed all the way to 100 for decent focus and it feels like it could go even further to be spot on. It's always been like this and just thought that it's normal.

Could this be improved somehow, maybe some mods to the FGM? The focus yokes are all the way towards the tube bells, don't think the problem lies there.

Thanks

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

Try decreasing the R131, R231, R331 (330 Ohm) resistors to 150 Ohm.

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4378 Location: Phoenix

Guys

Some resistors on the focus board may have changed value, try another board.

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4378 Location: Phoenix

Guys

Some resistors on the focus board may have changed value, try another board.

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Thanks Gjaky, ordered the resistors. Tim, I do have spare focus modules but they're older FCM ones and I think they acted similar. Can't bother switching before trying Gjaky's suggestion.

Tim in Phoenix · Joined: 21 Oct 2006 Posts: 4378 Location: Phoenix

Hmmm

"This is a ridiculously vague statement, almost like " not sharp enough? Go digital!"

That is a ridiculously harsh attack on me trying to help a guy. You may consider apologizing to me. I have spent hundreds of hours helping people here with every kind of Marquee issue and I am one of the most experienced technicians on Marquee anywhere, excepting a few engineer types. How am I supposed to know which resistors? Boards are so cheap now it would be silly to spend a lot of time trying to troubleshoot one.

Also, the problem could be waveforms coming off the control board not being within spec. Focus yokes rarely fail unless mishandled.

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Firstly, I'm really grateful for all the help!
Both of you guys, thanks so much for providing info in this is dying hobby.

Tim, you mentioned the CLM waveforms. How probable could this be?
I took off the Focus board and noticed something interesting. The center was out of focus as it should be, but the left and right sides were quite sharp! This kinda indicates that the problem is not located on the focus board.

Could this even be a software level bug? Very interesting for sure.
I'm still trying to change the resistor values as a trade-off fix

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

Well, normally you should set the focus coil physically so that in neutral position (ie. like the Focus board is taken out) the center part is as sharp as possible.Your coil is out of alignment.

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

What tubes do you have? All are from the same breed? How is this behaviour is different for the red tube for example?

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

All 3 are LCPs. They're a mixed bag age wise but that shouldn't be a problem.
The behaviour is identical on all 3 tubes. Posted some pics with Focus coils unplugged and the sharper edges are evident.

Thanks!

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

And how is it look like when the focus coils are plugged in, but all focus adjustments are neutralized in software?

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Yeah somethings definitely off. My rgb static focus for red and green was around 20 for sharpest picture, that's quite low afaik. Blue wasn't bad at all and was around 45. Actually, I can achieve okay focus for blue in the edges around 78.

Could this indicate a problem with green and red yokes? If I recall correctly, they have newer magnetics.

Here's some pics with focus plugged in and 50 settings:

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Still trying to figure the edge focus out. I noticed trying different settings with the dyn. astig helps with the edge focus. However, a new issue here. All the edge dots are triangular. I do have 6 pole magnets, but remember that it didn't help the shape of edges at all, only the center.
Could this still be improved with tweaking the 6 poles?

gjaky · Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary

CPC magnets only affect center area, you'd need a 6 pole dynamic astig, but that is not available in the Marquee.

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

are you sure your scheimpflug is setup well enough?

you should get reasonably shaped dots (not perfect) even at the edges instead of plain pyramids Wink

.

Meemil · Joined: 25 Mar 2016 Posts: 96 Location: Finland

Gjaky, so seems like it's somewhat common for these PJs.

Dvh, yeah it's decent, done with Guy Kuo's method. But I'll look into it.

I just realized something with Marquee's RGB focus. The boxes there are kinda misleading. I feel you get the best results by adjusting larger areas, trade off on the very center but gives best overall focus. Then doing the same with upper and lower zones.

dvh99 · Joined: 25 Dec 2009 Posts: 2158 Location: nederland

never use the internal patterns for focussing or converging but use them from the source itself for best results.
i have said this a dozen time before but just so to make sure everyone gets the most out of his (or her Wink

lol ) setup i`ll repeat myself.