CurtPalme.com Home Theater Forum

gregstv · Joined: 27 Aug 2007 Posts: 628 Location: Australia

Hi all
I have a PG9 that has a bit of green and red flare on peak whites.The tubes have no burn in and only 3500
hours on them.I have changed all the caps on the gain board and on the video out board.Is there anything
else i should check?The focus is great and the only way to get rid of the flare is to drop the contrast down
to a low level.Is this common with these units?
Thanks

Mark_A_W · Posted: Tue Jan 29, 2008 11:31 pm Post subject:

Did you tweak the astig?

gregstv · Joined: 27 Aug 2007 Posts: 628 Location: Australia

Hi
Yes i have but i am having trouble getting the outside round.The best i could get it was by using the cross hatch
and getting the vertical line to be as sharp as the horzontal.This is about the best i could get the focus.
When you defocus do you turn the focus control on the D board to the left or to the right.
If i turn it one way thay are close to a circle the other way there not.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

How about trying an edge focus with a dot pattern?

Tinman · Posted: Wed Jan 30, 2008 1:44 am Post subject:

Flare can be caused by low emission tubes, or driving them too high, or a combination of both. I'd suggest you find a peak white scene and set contrast to JUST below the flare point. It's also possible that G2 is a little low, but that's a whole can of worms that you DON'T want to open.

deronmoped · Joined: 03 Nov 2006 Posts: 1154 Location: San Diego

Check your lenses, see which one has the best focus and least amount of flare and put it on the green, put the 2nd best one on the red.

You might need to check the position of your focus coil on the tube neck, move that forward or backwards till you get best focus.

I put a second set of astig magnets on my tube to get a little better focus, I will probably try the six pole magnets next.

Did you set your astig while running your PJ at the contrast you use for viewing?

Deron.

Nitmoe · Joined: 10 Jan 2008 Posts: 60 Location: Iowa, USA

Focus on the lenses is only part of the equation. When reffering to astigmatism, this is an adjustment on the neck of the tube. There are also electronic focus pots to adjust. There is a lot of useful info on this site to help you out.

http://www.curtpalme.com/Astig.shtm

http://www.curtpalme.com/NECPG_MechSetup1.shtm

gregstv · Joined: 27 Aug 2007 Posts: 628 Location: Australia

Hi
Mark AW was right the astig was out slightly.I used curts tip on turning the focus pot to check if there is any movement
on the cross hair.It moved about 1/2 cm on all three tubes.
3 hours later no movement good focus and no flare.These are tuff little suckers to get right.
Thanks for all the help

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

Well, some people look inside the pj and start playing. It is unfortunate in the PGs case, because a lot of damage can be done. It sounds like this pj needs a thorough going over.

CasetheCorvetteman · Joined: 09 Nov 2008 Posts: 6326 Location: Australia

Yes Spanky id say youre right, these people you speak of probably had something far less technical before hand where everything was adjusted with trimpots, and with no further ado (and skipping setup instructions in the process) they lift the bonnet on the PG and start twisting every trimpot they see.

Doesnt matter though, i think we managed to get it looking pretty damn good considering it was a very temporary setup and we never touched any kelvin or colour menus. I did turn 2 of those G2 pots down though, one was almost all the way up, the other was about 2/3rds up or abit more.