CurtPalme.com Home Theater Forum

[yonexsp]

I have a problem developed with my XGLC.

There is a straight white line in the middle of the image, faint but there that has just recently appeared.

It does not matter what signal or input I use it is still there.

Also, if I select all white from the test patterns, a very clear to see cross is visible on the screen. Almost like the cross test patten, but off center and obviously faint, but bright enough compared to the background that it is visible. It appears on all tubes, R,G,B.

I tried disconnecting all inputs as well, removing the moome card etc, but it is still there. It is like the PJ is generating a cross signal all on it's own that shows up everywhere.

Any ideas? Is it aboard issue, some setting I missed?


FYI It is not the AKB line

[Tim in Phoenix]

Hello

You might unplug video feeds to the neckboards, see if the problem remains. Then maybe unplug convergence and stig yokes, see if any difference.

[Mark_A_W]

Up down or L-R?

A line across the screen can be caused by too much vertical linearity balance, or one of the other linearity controls.


Funny vertical lines/patches in the "back raster" indicate the need for a full mech white balance.


Mark

[Curt Palme]

A customer that got a new to him PG had the same thing, and it was too much top red keystone. Back off on the key and pin controls towards 50%, and see if it goes away.

[Curt Palme]

A customer that got a new to him PG had the same thing, and it was too much top red keystone. Back off on the key and pin controls towards 50%, and see if it goes away.

[yonexsp]

Left to right.

I reset the PJ back to factory default and it is still there

[Curt Palme]

Is it on all three tubes? You can unplug the astig, convergence and focus connectors going to the yokes to see if the problem goes away to narrow it down.

[Curt Palme]

Is it on all three tubes? You can unplug the astig, convergence and focus connectors going to the yokes to see if the problem goes away to narrow it down.

[yonexsp]

[yonexsp]

If I disconnect the video input cable from the neck cards, then the Vertical line disappears, but the very feint horizontal line stays.

That line stays after I disconnect the cables to the focus yokes as well.

So looks like 2 different issues, or a board that is starting to fail perhaps?

I took a picture of the tubeface with the 'All white' test pattern that shows the problem. Bit hard to see, but you can make it out.

[yonexsp]

bump

[Mark_A_W]

Picture?

[yonexsp]

[macgyver655]

I'd like to see an all white screen picture.

[yonexsp]

[LOTREE]

I have the same issue on my 1200x just it runs horizontally mid image. Mostly noticeable on bright images of any color.

[Mark_A_W]

Not sure about the colour bands running across the screen (camera artifact?).


But the the vertical line means it needs a white balance.

[yonexsp]

[Mark_A_W]

I think it's the back raster showing.

I'm not sure which control affects it (sub brite this, blah blah that).


But mine was similar when I got it, but much worse, with more lines over on the RH side, and doing the full mech balance fixed it.


Is the line still visible on a black image? That's the giveaway.

[yonexsp]

no, only full white

[Mark_A_W]

Ok, I've thought about it.


I think it means the black level (blanking) is not set to the pedestal correctly. This is the fundamental brightness control, you need to set it with a scope using a test pattern with vertical white stripes. It's very difficult to figure out which bit of the messy waveform is the pedestal...

If this is wrong, everything is wrong. But you may get away with just turning down the BLKG pots (using a scope and test pattern!).

[Mark_A_W]