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Ben851
Joined: 13 Sep 2008
Posts: 221
Location: Ottawa, Ontario
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| Posted: Sat Nov 01, 2008 2:27 am Post subject: Odd Issue with my XG... |
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Hey guys,
I pulled the trigger on an XG135 with semi-cooked but passable tubes about a month ago, and all has been great but I recently noticed an odd (to me - maybe you guys will know better than I) issue on the red tube.. On dark scenes, what I will call a second raster seems to appear.. It's about 2/3's the size of the actual raster and basically lights that 2/3's up as if the G2 setting was way incorrect.. The intensity of this second raster seems to be related to how dark a scene is.. really dark scenes (or black) produces a really bright "second raster" and it's non existent in bright scenes. Can anyone give me a hint as to what my issue may be?
Ending Credits of Iron Man: (The Spot is the lens reflection and is not present in reality)
A Brighter (But Still Dark) Scene:
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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kevin_k
Joined: 25 Oct 2007
Posts: 67
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| Posted: Tue Nov 04, 2008 3:23 am Post subject: |
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Your R BKG pot is most likely out of adjustment. If you put a very fine marker line on your pot and adjust it slightly that should correct it. If it doesn't, you can put it back. That pot is very hard to adjust on a scope.
If that is the problem, you'll have to adjust your G2 again.
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Tue Nov 04, 2008 6:17 am Post subject: |
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Are you running 1080p when you get this? If so, I would suspect you need to shorten your re-trace timing which you can do via your HTPC video card setting or by using a DVDO VP 50.
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Jerry
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Ben851
Joined: 13 Sep 2008
Posts: 221
Location: Ottawa, Ontario
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| Posted: Tue Nov 04, 2008 12:39 pm Post subject: |
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Hey Guys thanks for the replies..
Nashou66, I will try swapping neck boards
Kevin K,
I'm pretty sure that the G2 for the GREEN has been adjusted by the previous owner to compensate for the wear on the tube - could this somehow be causing the effect on the red?
Jarseneau, I'm actually only running 1280x768 right now as I haven't had the time to do a full setup..
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Thanks,
Ben
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MikeEby
Joined: 24 Jun 2007
Posts: 5237
Location: Osceola, Indiana
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| Posted: Tue Nov 04, 2008 12:56 pm Post subject: |
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| jarseneau wrote: | | Are you running 1080p when you get this? If so, I would suspect you need to shorten your re-trace timing which you can do via your HTPC video card setting or by using a DVDO VP 50. |
Yep, that looks like classic 1080p foldover from incorrect timings.
Mike
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Doing HD since the last century!
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Ben851
Joined: 13 Sep 2008
Posts: 221
Location: Ottawa, Ontario
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| Posted: Tue Nov 04, 2008 1:07 pm Post subject: |
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And if I'm not using 1080p?
I would have thought something like that (foldover) would have been apparent on all 3 tubes and not just red?
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Thanks,
Ben
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Nov 04, 2008 2:49 pm Post subject: |
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Turn your red off, then turn up the brightness, you will see the same in the other two tubes is my bet....
I replaced the green, the original was quite a bit worse than the one in there now. I did not adjust the pots at all after replacing it, simply hitting Kelvin or Brightness evened out the output levels very nicely.
You could try using the service white balance controls to tweak it a tiny bit, just write them down before you start in case it starts to get away from you...
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jarseneau
Joined: 06 Nov 2007
Posts: 323
Location: WI
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| Posted: Tue Nov 04, 2008 6:14 pm Post subject: |
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| Ben851 wrote: | And if I'm not using 1080p?
I would have thought something like that (foldover) would have been apparent on all 3 tubes and not just red? |
I would bet it is happening equally in all 3 colors but not as easily seen as Elaine Benes said.
As far as what to do about it, I have seen applying blanking on the offending side to work but probably not the best solution since it doesn't address the cause which I believe is the signal source (your HTPC video card setup). I would go into the video card setup 'Advanced' timing area and adjust width (horizontal porch) to see if you can move the 'needle' on this.
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Jerry
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kevin_k
Joined: 25 Oct 2007
Posts: 67
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| Posted: Tue Nov 04, 2008 9:02 pm Post subject: |
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If the pedestal level for that pot is off compared to the others it will show. That is probably the underlying problem. Search for scoping an xg with my name and read that.
Hope it helps
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Elaine Benes
Joined: 25 Apr 2006
Posts: 1416
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| Posted: Tue Nov 04, 2008 9:31 pm Post subject: |
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| kevin_k wrote: | If the pedestal level for that pot is off compared to the others it will show. That is probably the underlying problem. Search for scoping an xg with my name and read that.
Hope it helps |
I looked through your previous posts on the XG setup and couldn't see any resolution to your issues, did you in fact get the XG setup properly ? If so, HOW did you do it ?
Specifically, what control allows one to slightly lower the "pedestal" of one tube ? Is it necessary to do a full on scope set up or can one simply give a single control a tiny tweak ?
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Wed Nov 05, 2008 2:12 am Post subject: |
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Kevin is right, the black level isn't set to the pedestal level correctly. (They call it the Blanking level.)
If you adjust Brightness (therefore enabling AKB), and the Kelvin controls, and the back raster is still visible, then you need to adjust the BKG pots, preferably with a scope.
Unfortunately that is step one of a full mechanical white balance.
I had to do the whole lot on my XG to get rid of the back raster, because the BKG pots were wrong.
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