CurtPalme.com Home Theater Forum

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

hello out there,

my XG has a problem i have long lived with, but now it's time to chellange it:

Most of the times I turn the machine on, the raster is to bright (as if brightness was turned up to much), resulting in a washed out image. When I let AKB kick in (by pressing PIC FUNC), this gets corrected and black levels are good. Sometimes the problem reappears after some minutes and I have to turn AKB on a second time (I normally turn AKB back off, because I don't like the thin AKB-line).

When switching between inputs/resolutions I also often see the lit raster.

I think something like this came up already, but I dont remember exactly what to look for.

Anybody familiar with this?

Thanks,

Daniel.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

The G2 is a little to high. In the PG's you can just turn the G2 down a little and it corrects this. I'm not 100% sure but I dont think you can adjust the G2 on the XG. Which XG do you have?

dropzone7 · Joined: 12 Jun 2007 Posts: 1069 Location: Charlotte, NC

kschmit2 · Posted: Mon Feb 11, 2008 9:04 pm Post subject:

Did your PJ get retubed at one point in time?

Kai

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

Mark_A_W · Posted: Tue Feb 12, 2008 2:23 am Post subject:

My XG is the same, even after a white balance (in fact multiple white balances and even parts replacements...I think it's the red tube).

My Green and Blue Bias start too high, and Red too low. If I hit BRIGHTNESS and enable AKB too early it will correct it...for about 2 minutes then it drifts to too high Red.

I just have to let it warm up for 10 mins. When I had cooling mods it took over an hour to settle..

Just let it warm up before you enable AKB, or you will end up chasing your tail...in fact if you let it warm up you shouldn't need to touch AKB at all.

My Xtra didn't do this - it was a much more robust chassis in many ways, although I'm sure my Red tube is the partial cause of my issue in the XG. It's manageable, just let it warm up.

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

Mark_A_W · Posted: Tue Feb 12, 2008 10:22 am Post subject:

What happens if you just leave it be?

Does it come good eventually on it's own?

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

Mark,

I will have to try this out this evening.
Is yours okay after 10 minutes without hitting akb?

Daniel.

Mark_A_W · Posted: Tue Feb 12, 2008 12:47 pm Post subject:

Yes. If I leave it alone and let it warm up, it is fine without touching anything.

nzryan · Joined: 02 Jul 2007 Posts: 41 Location: New Zealand

Have you tried looking the voltages to see if they change in this time?

Mark_A_W · Posted: Tue Feb 12, 2008 11:45 pm Post subject:

I have, and my G2 didn't move.

After changing all the boards and checking all the voltages I came to the conclusion it is the actual red tube.

nzryan · Joined: 02 Jul 2007 Posts: 41 Location: New Zealand

what about some of the other control lines/signals on the neck board?, well thinking about it mine does this also, but only a little, and its the red too.

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

i was investigating the problem yesterday evening and i saw ... nothing. Everything was fine from the begining on. Will keep on monitoring ...

dropzone7 · Joined: 12 Jun 2007 Posts: 1069 Location: Charlotte, NC

I don't think I have ever used the AKB option only because I did not know where it was. I see that you push "PIC FUNC" to enable it. Hmm...I notice when I got under "PICTURE", then select "BRIGHTNESS" and hit "ENTER" the picture flashes for a second and then returns to normal with the brightness scale displayed on screen. Is this the same as enabling AKB? If not, what is happening here?

kschmit2 · Posted: Wed Feb 13, 2008 5:43 pm Post subject:

no, but it briefly enables AKB.

To "permanently" enable it you have to set it in the "Source Information screen":
Press Adjust and enter your passcode
then press INFO, go to page 2 using the up/down arrows, navigate to AKB using the up/down arrows, then press enter.
Now press END, STORE, ENTER

AKB is now enabled until you manually switch it off again.

Note you will only have to enable it periodically, and can then switch it off again.
I think Doug recommends powering off the PJ at least once before you disable AKB again, to ensure that the new values stick.

Kai

nzryan · Joined: 02 Jul 2007 Posts: 41 Location: New Zealand

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

I did another test run:

When I turn on the PJ, the raster is completely dark - nothing to see, even when looking directly into the tubes.
Within the next 10 minutes the rasters get slightly illuminated, but nothing unnormal or noticeable on screen.
I let the PJ run for half an hour and nothing changed on that status.
Then I changed the signal frequency (from 72 to 75 Hz), which makes the XG change to the assigned signal entry. Dircelty after that the rasters were very illuminated and black level severly crushed (on all tubes, maybe most visible on red).
Now I entered BRIGHTNESS and everything went to normal again. Didn"t change at all during the movie we watched afterwards.

This behaviour does not seem to be temperature-dependent.

Mark_A_W · Posted: Thu Feb 14, 2008 10:36 am Post subject:

Just sounds like you need to hit PIC FUNC and STORE when BRIGHTNESS menu is active and AKB is therefore on.

It's behaving like AKB is not stored for that signal. You have to store AKB (by setting brightness) for every signal.

Bert Randolph · Joined: 03 Jul 2007 Posts: 81 Location: Germany

i STOREd a lot of times when BRIGHTNESS was active, but will try again.