WG6100 "Blue Ghost"

jetusenet

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Donor 4 years: 2011, 2013-2014, 2024
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Hi;
I completely rebuilt my 6100, deflection PCB (including mods), HV (w/new HVT) and Neck PCB- caps and transistors everywhere!

Anyhow, the display is fantastic but there is this blue ghost in the middle-ish of the display. If I fiddle with the focus, the ghost concentrates into a dot-ish but remains there and the rest of the display is out of focus.

The only way I can diminish the ghost is to turn down the screen but in order for it to go completely away, I have to turn it down to the point that the display is no good.

The HV is spot-on 19.5kV w/ zero beam.
I have already degaussed the CRT and brackets.
I have checked the CRT with by B&K and the results were good.
I did the color set-up with the Bias and Drive.
None of these actions have changed the ghost presence.

It looks like it has something to do with the new HVT but I really do not know. I searched the monitors section and came up with nothing.



Here are some short clips:

http://www.youtube.com/watch?v=n5OdEYfpakc

http://www.youtube.com/watch?v=5_wwwMm70pc

http://www.youtube.com/watch?v=Rny6wyptDk4

http://www.youtube.com/watch?v=GCkzgcKxIsM

http://www.youtube.com/watch?v=-f3EqzdYRM8

Has anyone else seen this?????


Thanks in advance
Jeff
 
Here is another short video showing that when the focus is adjusted, you loose the text but the "ghost" comes into focus:

http://www.youtube.com/watch?v=aa_oekpInds

In fact, you can see a blue and a green dot, (the red flashing dot is from the camera) and another green ghost towards the right of the CRT, become a pin point, one above the other but when you bring the text back into focus, the 2 dots, (green and blue) become that "ghost".

I tested the transistors on the neck board and they test fine.

I swapped a known good board-set and had the same results.

I am leaning towards the HV section or maybe the CRT itself.

Has anyone else see this anomaly?
 
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That can be easily reproduced on a perfect working set by simply over driving the color and the brightness. I know - I read what you've done but what you need do so is play it and when you approach the death star - if you see (IIRC) "The force be with you" or the name of the guys who designed the game then you're brightness is too high and/or you're driving the color gun/s too hard.

While it's not entirely impossible the tube is needing some help, the only thing you swapped was the deflection board and the problem stayed. You're still using the same HV, tube and neck board.

Download the K6100 manual and go to the page where it shows the line test in the OP menu to set brightness.
 
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Thanks for the suggestion but the overall brightness is not the issue....

When I start with the screen all the way down, full counterclockwise and slowly bring it up, the "ghost" comes up before all the colors do.

Another fact: After the monitor has been set up, for colors, screen intensity etc. when it is first turned on, the blue ghost comes up right away and then in a few seconds, as the CRT warms up, the other colors come up like normal.

If you check the videos that I had posted, you will see when the game is first turned on, you will see the ghost before everything else comes up. And in the second post, you will see when I turn down the screen or adjust the focus, what the results are.....

I am going to swap tubes today and I am leaning towards that as the culprit.

Jeff
 
I swapped CRTs and the problem has been resolved.

I still would like to know what had caused the CRT to have this problem after the rebuild.
I installed the defective CRT into the donor chassis and I will fire it up when I have the chance to see if the problem has carried over.

I had placed the CRT on my B&K and it showed all's well. No shorts etc, which is a possible explanation for the gun firing. Would the B&K show this type of failure?
Would that even be a plausible explanation for this anomaly?

When I get the chance, I'll hook it up to my test rig and see what I shall see.....

Thanks again for all the help guys.
Peace
Jeff
 
I fired up the "broken" CRT that was placed in the donor chassis and it works without issue.

I have a gut feeling that the HVT caused this, is that a plausable explaination?

Would that be possible?

Jeff
 
So if I understand you correctly, you took all of your working parts and swapped them to another tube with no issue. The tube that had the "ghost" does not exhibit the ghost any more with a different set of parts (HV, deflection, neck board). Is that correct?
 
I removed the "ghosting" CRT from the completely rebuilt monitor, (HVT, caps, transistors, etc.) and placed in an all original, working chassis and the problem was gone so something in the newly rebuilt chassis was causing the ghosting.

What was strange, if you check the video you will see, is that when I adjusted the focus, it has such an impact of that anomaly. When the display was in focus the ghost was there but when adjusted, the ghost became 2 or 3 points on the display and the text was then out of focus.

If the CRT was shorted, it would have carried over.

Any ideas on what could have caused this are appreciated.

Jeff
 
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