Return to the CurtPalme.com main site CurtPalme.com Home Theater Forum
A forum with a sense of fun and community for Home Theater enthusiasts!
Products for Sale ] [ FAQ: Hooking it all up ] [ CRT Primer/FAQ ] [ Best/Worst CRT Projectors List ] [ Setup Tips & Manuals ] [ Advanced Procedures ] [ Newsletters ]

 
Forum FAQForum FAQ   SearchSearch   MemberlistMemberlist  Photo AlbumsPhoto Albums  RegisterRegister 
 MembershipClub Membership   ProfileProfile   Private MessagesPrivate Messages   Log inLog in 
Blu-ray disc release list and must-have titles. Buy the latest and best Blu-ray titles to show off in your home theater!

Issue with green

 
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors
View previous topic :: View next topic  
Author Message
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Tue Feb 20, 2018 7:21 pm    Post subject: Issue with green Reply with quote


        Register to remove this ad. It's free!
Hello,

I have a rather odd problem on the green with my BG 1209s. If I display a green grid (1080p72Hz signal), I have the horizontal lines looking much more brighter than the horizontal lines. Lum/Contrast = 50. This problem occurs only on the green. Thanks for your help.

Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Tue Feb 20, 2018 7:29 pm    Post subject: Reply with quote

Can you try an external test pattern? I've never seen this before. What if you use a lower resolution?
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Tue Feb 20, 2018 8:24 pm    Post subject: Reply with quote

Here is a picture with a Lumagen test pattern (1080p60Hz this time): same thing apparently Sad

Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Tue Feb 20, 2018 8:41 pm    Post subject: Reply with quote

Try a lower resolution for fun. I am a bit stumped though.

Also try swapping CRT neck boards between tubes.

Check the 17.5 volt test point on the SMPS to make sure it's accurate.

Pull the convergence tray from out of the front (power cord unplugged) and power back up to see if that fixes it. (I doubt it)
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Tue Feb 20, 2018 8:49 pm    Post subject: Reply with quote

With 1080i60, Here is the results with Lumagen test pattern for each color (notice the "fat" horizontal green line):


Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Tue Feb 20, 2018 9:25 pm    Post subject: Reply with quote

It seems that it is a bit more complicated to swap neck boards than with a 808. Do I need to remove the big part from the end of the tube to remove the neck board?
Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Tue Feb 20, 2018 9:31 pm    Post subject: Reply with quote

Just loosen the two screws that you see that go into the black heat sink at the top, then the CRT socket wiggles off, and the wiring disconnects at the top heatsink, and the other one at the motherboard.
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Tue Feb 20, 2018 10:08 pm    Post subject: Reply with quote

Is it the neckboard to swap ? The neckboard seems to come with the socket. So I need to swap the neckboard+the socket.


I have one wire to the motherboard but also two black wires remaining and going to the tube.
About the 17.5V point to check is it labelled J36?
Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Tue Feb 20, 2018 10:51 pm    Post subject: Reply with quote

Yes, swap that whole assembly over between tubes.
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Wed Feb 21, 2018 9:13 am    Post subject: Reply with quote

Well, I swaped the neck boards: no change. I checked J36 for the 17.5V: I got 17.51V. And I removed the convergence tray: no change.
Which card manage the green signal?
Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Wed Feb 21, 2018 2:47 pm    Post subject: Reply with quote

I'd change the two video boards, the V board, H board. The V and H boards have some circuits on them that could affect the video signal, but I'd suspect the video boards first.

I've got the boards at $15 each (4 minimum) plus shipping.
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Wed Feb 21, 2018 3:02 pm    Post subject: Reply with quote

I have some replacement cards but I need to check if I have these. About the video cards, one (the port 3) has a HDMI connector (from Greg Eisemann, I took it from my former BG 808).
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Wed Feb 21, 2018 5:02 pm    Post subject: Reply with quote

I had a replacement for the rgb video boards and it seems to fix the problem. The weird thing is that the replacement card does include a small module (electronic card with some yellow wires) and I do not know what it is for. Here is a picture (the module R76274S or R762745 is on the bottom left):


Back to top
Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 24296
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Wed Feb 21, 2018 7:56 pm    Post subject: Reply with quote

I think it may be for contrast modulation, I can't remember. Smile
Back to top
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Thu Feb 22, 2018 6:56 am    Post subject: Reply with quote

Anyway, thanks a lot for your help Curt Thumbs Up
Back to top
barclay66




Joined: 27 Jun 2011
Posts: 1291
Location: Germany

TV/Projector: Marquee 9500 Ultra


PostLink    Posted: Thu Feb 22, 2018 9:55 am    Post subject: Reply with quote

Hi,

The add-on board is a R762745 - QUAD decoder+Comb_Filter. This is only necessary, if You want to feed other signals than RGB (e.g. Composite Video or S-Video). You should be able to transplant the add-on board to the video board You want to be using...

Kind Regards,
barclay66
Back to top
View user's photo album (25 photos)
Corleone88




Joined: 09 Dec 2006
Posts: 443
Location: France


PostLink    Posted: Thu Feb 22, 2018 9:59 am    Post subject: Reply with quote

Ok thanks. I think this shouldn't be necessary I think Smile
Back to top
Display posts from previous:   
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors All times are GMT
Page 1 of 1
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum