CurtPalme.com Home Theater Forum

[CZ Eddie]

Example:

I set color to red, then ramp up contrast to about 60, and I can start to see the green bleeding through onto the screen. About 80 contrast and I see blue bleeding through.

I get color bleed through of all three colors at various contrast settings. I've seen this on other Marquee and never worried about it because I don't run contrast that high. But I'd like to fix it on this projector. Anyone know how?

[JustGreg]

Are you seeing the rasters lit when that color isn't selected? If so I think Nash changed three resistors in the HVPS G2(?) lines to fix this. I could be wrong but he'll calibrate me if I am and then we'll both know.

http://www.curtpalme.com/forum/viewtopic.php?p=106306#106306

"After you put power supply back in turn on projector and bring up the grid. Now select one
color at a time by pressing color then 1(red) 2 (green) 3 (blue). Do one at a time starting
with red... look into the other tubes and see if you can see the grid displaying on another color .
A very very light grid is not too bad of a problem and wont show up on the screen.
However Some of use who have done this complete mod with caps and resistors have had it
where when one color is on the tother tube or tubes are also lit up to the point it can show
up on the screen. I and one other person have decide to measure the value of the resistor we
took out and replaced with the 560kohm ones. Mine were close to 680kohm, I thought that if i
increased the value of the ceramic resistor to that of the old drifted ones the anamoly might
go away, which it did. now I did not notice any ill effect so far with this increase. And if you don't
notice a problem with the projected image then leave the 560kohms in. It might only happen
with the cap changes not sure but post back your results here, I would like to find out if others
have noticed this as well. Mike Parker has not noticed this happening to the ones he has done
and suggested to me not to change the value, howwver it was way to bright and it was affecting
my picture. After the fix all is well after many hours of use."

[CZ Eddie]

Thanks, Greg.. I'll check that out!

And yes, I did all the HVPS mods.

[Nashou66]

Well Greg it depends on if Eddie did in fact change the 560kohm resitors. If he did and sees this issue then he should measure the old resistors and replace them with the average of those that are in the same color channel. This doesn't happen for every HV i have done but on two out of the 4 of the ones i did change this problem did happen.

Athanasios