CurtPalme.com Home Theater Forum

[jbmeyer13]

The following photos show a strange line that only shows up during dark scenes; a little less than a quarter of the way from the right border. This first appeared after Craig did a greyscale calibration and it appears on all memory channels (800p/72, 1080p60, 1080p48, etc.) and sources (BD, HD Cable). Oddly enough I can only find it on the blue/red channels but not green.

I tried the following to no avail:

1) adjusting the phase to see if it could be something with the deflection module but the line doesn't move.
2) swapped neck cards and the leads to the VIM.
3) entered the secret menu and lowered the internal pattern generator level.

any thoughts on what this is being created by; ground loop, CLM, VIM??

[stridsvognen]

https://www.curtpalme.com/forum_archived/viewtopic.php@t=29890.html

Its a Marquee thing..

[mr_ro_co]

[jbmeyer13]

[stridsvognen]

I can only say don't do that mod.. And for sure you need a new calibration if you do it.. I don't think there ever was a perfect solution to it.. But a option was to use a different value resistor then the one recommended by VDC.

But you still will mess up your calibration.

[stridsvognen]

[Nashou66]

[mr_ro_co]

[Nashou66]

Here is the lines I had but these were from the CMM board which Justin does not have. But if you look close you can see squiggly lines here going across the image and they are vertical. This was from the Astig board but I was told by Scott that they can make other weird things as well.



So try those ferrite clamps first.

Maybe even on the Video cables right off the VIM.

you never know.

Athanasios

[stridsvognen]

[Nashou66]

The thing is , not all Marquees do this. He also stated that he used ferrite beads on the connector lines of the VIM to eliminate them.

So hence my idea of the ferrite beads on the Video cables and the astig cables where i have seen lots of noise.

Just look at this video and what those clamps can do.

https://www.youtube.com/watch?v=P7Eu4RHnle8

Athanasios

[stridsvognen]

[Nashou66]

Justin, is it there which the internal video pattern set to black? And when in black raise the brightness so you come out of black and into the amount go grey you see the lines and see if they are present on the internal black pattern. Even the stair step pattern might show it.

Athanasios

[jbmeyer13]

The other problem with the faint line thread is that it went off on a tangent; remote, capacitors, etc.. It sounded like Mike Parker eliminated this issue by creating a switch that shut off the internal generator but then he started trying to use the remote to control this and there was no clear answer as to the end result.

Nash- I'm looking for the clamps..

[jbmeyer13]

[Nashou66]

[stridsvognen]

[Nashou66]

I had an issue with the internal patterns still being visible if say one color was on, like green, but i could still faintly see red and blue. the Super secret password menu fixed that. Default value was 70 i lowered it to 50. Problem solved. I wish it was going to fix this but it didn't.

I was thinking of why some Marquees do it and others don't? Does this follow Vim's or is it more the CLM issue? id the latter then I wonder if a chip change for the pixel generator might be the answer? or the DC restore op amp the tlo71 on the VIM?

Athanasios

[stridsvognen]

[Nashou66]