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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Sat Aug 31, 2013 10:52 am Post subject: 9500LC Issue with Noise on Blue only. |
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Hi,
I have a 9500LC with DraganM Mods, Moome V3 Card running 2.35:1.
Recently on dark images I have had a fairly wide lighter line running horizontally through the image. Tonight I displayed a black image and took a look at the tube faces.
On my blue face I see this:
My Red and Green Look as expected (Red Shown)
Does anyone have any ideas on where I should start with this (Or what it is?)?
Regards
Daniel Parker[/img]
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stridsvognen
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| Posted: Sat Aug 31, 2013 6:41 pm Post subject: |
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Wow.. thats a lot of noise you got there on blue.
How is it effected when adjusting brightness up and Down.?
It looks like you should run a lower G2 setting if the pics is taken from a Black image.
Have you reseated the CLM VIM LVPS HVPS and moome Card, to see if that change anything.?
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sat Aug 31, 2013 7:05 pm Post subject: |
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Do the test patterns do it too?
My guess is a bad ground connection on the blue video cable between the VIM and CRT socket.
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Sun Sep 01, 2013 4:26 am Post subject: |
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Guys that's not the g2 adjustment to looks like a loose or bad ground on that tube(I know what raster looks like and that's not normal)
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crt king of black
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Sun Sep 01, 2013 4:58 am Post subject: |
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| Curt Palme wrote: | | Do the test patterns do it too? |
Yes, but not as badly as when it has a signal from my HTPC.
| Curt Palme wrote: | | My guess is a bad ground connection on the blue video cable between the VIM and CRT socket. |
I swapped the blue and green cables over on the VIM. The issue then moved to the green (although subjectively not as badly)
Green Tube
Blue Tube (Really show up my burn in (previous owner))
Swapping them back over, and my Blue has lots its horizontal line, but gained a vertical, and more noise.
My thoughts are that some of this noise is coming out of my VIM, but if that was the case, should I be seeing it on the internal test patterns?
Regards
Daniel Parker[/img]
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Sun Sep 01, 2013 5:01 am Post subject: |
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| danielparker wrote: | | Curt Palme wrote: | | Do the test patterns do it too? |
Yes, but not as badly as when it has a signal from my HTPC.
| Curt Palme wrote: | | My guess is a bad ground connection on the blue video cable between the VIM and CRT socket. |
I swapped the blue and green cables over on the VIM. The issue then moved to the green (although subjectively not as badly)
Green Tube
Blue Tube (Really show up my burn in (previous owner))
Swapping them back over, and my Blue has lots its horizontal line, but gained a vertical, and more noise.
My thoughts are that some of this noise is coming out of my VIM, but if that was the case, should I be seeing it on the internal test patterns?
Regards
Daniel Parker[/img] |
Pull the vim and check the blue connection if it is good and tight then the vim may be the issue
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crt king of black
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Sun Sep 01, 2013 5:11 am Post subject: |
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| the big E wrote: | | Pull the vim and check the blue connection if it is good and tight then the vim may be the issue |
I will do this.
Something else I was thinking of.. My HTPC is currently out of its cupboard, and I can hear its fans. While looking at the tube face, I thought that I could see more noise as I heard the fans increase their RPM. Both the Projector and the PC are on the same power socket / circuit.
Could my PC be dumping noise down either the Power cable, or over HDMI?
I have sort of discounted this, as it would affect all tubes, but I thought I would put it out there.
Daniel
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the big E
Joined: 20 Apr 2013
Posts: 1928
Location: speedwell Tn.
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| Posted: Sun Sep 01, 2013 5:18 am Post subject: |
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| danielparker wrote: | | the big E wrote: | | Pull the vim and check the blue connection if it is good and tight then the vim may be the issue |
I will do this.
Something else I was thinking of.. My HTPC is currently out of its cupboard, and I can hear its fans. While looking at the tube face, I thought that I could see more noise as I heard the fans increase their RPM. Both the Projector and the PC are on the same power socket / circuit.
Could my PC be dumping noise down either the Power cable, or over HDMI?
I have sort of discounted this, as it would affect all tubes, but I thought I would put it out there.
Daniel |
Computers are the worlds worst noise makers(power line wise)next to a few other things and shouldn't be used on the same circuit
I have my projector on a seprate plug from my equpement(same for my HDfury) and haven't had no noise in the video that I can see and I would notice it for sure as I am super picky about the image quality
If you can try a different source and see if the projector still has the noise if not then its the pc(note certain ups (uniteruptible power suppies) can add noise if used incorrectly
Also a bad ac outlet ground can cause this issue also
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crt king of black
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stridsvognen
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| Posted: Sun Sep 01, 2013 10:35 am Post subject: |
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Disconect all, and look into the tube after the no sync text is gone. If its still there its not your source.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Sep 01, 2013 2:26 pm Post subject: |
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I can't see your PC putting noise on just one color, but a bad ground at the BNC or VGA end of the cable can do that. try a different VGA to 5 BNC cable, or flex the cable at each end, as the ground will cut in and out, and the noise will come and go if that's the case.
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stridsvognen
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| Posted: Sun Sep 01, 2013 6:56 pm Post subject: |
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Curt i think he is using HDMI.. Moome Card.. So if its cable/ ground it should be ftom the vim to the neck boards, or a problem with the moome Card, i have a new moome Card whos defect in just color channel..
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Sun Sep 01, 2013 9:23 pm Post subject: |
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Its not my PC (as far as I can tell). I ran an extension cord from the other end of the house and tested, and there was no change.
I have tried a different HDMI cable, with no change.
Later today I will try a different Moome card (I have a V1 here).
I removed the VIM and checked for dry joints etc on the output sockets. These seam to be fine, and are tight.
The pattern of the noise changes randomly, as can be seen in this short video (20mb)
http://cdn.beercellar.com/misc/forums/1.MOV
I will also try with a different source, and no source and report back, but it was present on the internal patterns (nowhere near as bad.. Im guessing because of lower frequency. I run 1920 x 817 at 72hz)
Regards
Daniel Parker[/url]
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Sep 01, 2013 9:27 pm Post subject: |
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OK, swap the blue and green video cables on the VIM See f the problem switches to the green tube.
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Sun Sep 01, 2013 9:33 pm Post subject: |
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It did, but not as visibly badly (Scroll up and look at last green image to view)
All of these shots are on a 'black' image (Start of a movie, then paused before opening credits)
Daniel
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Sun Sep 01, 2013 9:43 pm Post subject: |
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Sorry, I guess I should read the whole thread. 
OK, try swapping the single black wire on the CRT socket. that's the G2 wire. See if the noise follows to another tube.
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Mon Sep 02, 2013 8:42 am Post subject: |
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| stridsvognen wrote: | | Disconect all, and look into the tube after the no sync text is gone. If its still there its not your source. |
With all Input sources disconnected, the noise is still there.
I then removed the Moome card, and its still there 
Daniel
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Mon Sep 02, 2013 9:06 am Post subject: |
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| Curt Palme wrote: |
OK, try swapping the single black wire on the CRT socket. that's the G2 wire. See if the noise follows to another tube. |
Swapped my blue and green heatshrink marked black wires over from the CRT sockets.
The result when turned on was my blue was much brighter with no signal (All cables and Moome card disconnected) than before, and contained the same noise (But due to its brightness was harder to see)
The green tube either looked off or very dim. No noticeable noise. Red, as it was untouched, looked normal.
If I had to guess, I would say the noise did not move.
Daniel
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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danielparker
Joined: 23 Sep 2007
Posts: 27
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| Posted: Mon Sep 02, 2013 8:37 pm Post subject: |
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| Nashou66 wrote: | | on the Vim there is an axial resistor next to one of the op amp chips on each channel, check to see if that resistor connection is solid. |
OK.. Im not sure where to look. On my entire VIM, I can only find three axial resistors.. All the rest are SMT. The three that are on there (One on the top of the board, and two on the bottom) look like a modification that has been done at a later date.
 [/img]
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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