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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Fri Feb 22, 2013 8:28 am Post subject: |
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Ile,
The luminosity is from the BG 808 (I don't change values from the OPPO) and 60 is the value that I need to go in order to see the black bars flashing. To adjust the G2, the luminosity is set to 50. But with G2 raised more than just to have rasters barely visible, I need to raise the luminosity very high to avoid crushing blacks.
What I don't understand is that with G2 not adjusted correctly before, the blacks were not crushing anymore after 30 minutes. Why now they are ??
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Sat Feb 23, 2013 12:39 pm Post subject: |
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I noticed something during G2 adjustment. In order to get a black picture to the BG808, I used the my OPPO only or my HDQ+OPPO and the result for a black picture is not he same. I have more light with the HDQ so I have to lower the G2 levels. How is that possible?
P.S: HDQ outputs 1080i@96 with RGB video and everything else are default values
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Mon Feb 25, 2013 10:09 pm Post subject: |
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Following Greg Eisemann advice, I put back my original RGB amps (with LEDs). I went to service menu->G2 and the leds were turned off but when I put the constrast to 0 and the brightness to 50, the rastes were bright. Why ? I tried to lower the G2 in order to see slightly the rasters as the procedure (when RGB amp don't have LED) is described.
I went then to the service menu->G2 and the LEDs were still turned off. So I am wondering if there is something wrong on my G2s as I lowered very much the G2 values and there were no LED turned on.
How are the LEDs working? Do they turned on when the pots are precisely ajusted or if they are below a threshold?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Feb 26, 2013 1:08 am Post subject: |
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| Corleone88 wrote: | Following Greg Eisemann advice, I put back my original RGB amps (with LEDs). I went to service menu->G2 and the leds were turned off but when I put the constrast to 0 and the brightness to 50, the rastes were bright. Why ? I tried to lower the G2 in order to see slightly the rasters as the procedure (when RGB amp don't have LED) is described.
I went then to the service menu->G2 and the LEDs were still turned off. So I am wondering if there is something wrong on my G2s as I lowered very much the G2 values and there were no LED turned on.
How are the LEDs working? Do they turned on when the pots are precisely ajusted or if they are below a threshold? |
As I understand G2 adjustment with the LEDs the LEDs turn off when the right G2 level is reached but I also understand that this level varies with the age of the amps and is therefore not a reliable way to adjust G2. The best way is to use and external system to get the right G2 level.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Tue Feb 26, 2013 8:32 am Post subject: |
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| km987654 wrote: | | Corleone88 wrote: | Following Greg Eisemann advice, I put back my original RGB amps (with LEDs). I went to service menu->G2 and the leds were turned off but when I put the constrast to 0 and the brightness to 50, the rastes were bright. Why ? I tried to lower the G2 in order to see slightly the rasters as the procedure (when RGB amp don't have LED) is described.
I went then to the service menu->G2 and the LEDs were still turned off. So I am wondering if there is something wrong on my G2s as I lowered very much the G2 values and there were no LED turned on.
How are the LEDs working? Do they turned on when the pots are precisely ajusted or if they are below a threshold? |
As I understand G2 adjustment with the LEDs the LEDs turn off when the right G2 level is reached but I also understand that this level varies with the age of the amps and is therefore not a reliable way to adjust G2. The best way is to use and external system to get the right G2 level. |
What kind of external system?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Feb 26, 2013 9:18 am Post subject: |
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| Corleone88 wrote: | | km987654 wrote: | | Corleone88 wrote: | Following Greg Eisemann advice, I put back my original RGB amps (with LEDs). I went to service menu->G2 and the leds were turned off but when I put the constrast to 0 and the brightness to 50, the rastes were bright. Why ? I tried to lower the G2 in order to see slightly the rasters as the procedure (when RGB amp don't have LED) is described.
I went then to the service menu->G2 and the LEDs were still turned off. So I am wondering if there is something wrong on my G2s as I lowered very much the G2 values and there were no LED turned on.
How are the LEDs working? Do they turned on when the pots are precisely ajusted or if they are below a threshold? |
As I understand G2 adjustment with the LEDs the LEDs turn off when the right G2 level is reached but I also understand that this level varies with the age of the amps and is therefore not a reliable way to adjust G2. The best way is to use and external system to get the right G2 level. |
What kind of external system? |
Have a look at the Chromapure thread on the main page.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Feb 26, 2013 10:38 am Post subject: |
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Yes
There should be some good examples there.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Tue Feb 26, 2013 8:10 pm Post subject: |
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| km987654 wrote: |
Yes
There should be some good examples there. |
Sorry I didn't find anything.
I also measured the test point on the SMPS board and I have : 17.54V. So, Ok or not ?
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Wed Feb 27, 2013 12:41 am Post subject: |
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| Corleone88 wrote: | | km987654 wrote: |
Yes
There should be some good examples there. |
Sorry I didn't find anything.
I also measured the test point on the SMPS board and I have : 17.54V. So, Ok or not ? |
Isn't this the sort of device you need?
https://www.curtpalme.com/forum_archived/viewtopic.php@t=27134.html
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Feb 27, 2013 8:39 am Post subject: |
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Yes and I already have one, but I don't see how it can help me adjusting my G2s.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Wed Feb 27, 2013 8:48 am Post subject: |
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| Corleone88 wrote: | | Yes and I already have one, but I don't see how it can help me adjusting my G2s. |
Don't these devices provide proper grey scale which in turn requires correct G2?? So can't you simply adjust G2 to obtain correct grey scale??
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Wed Feb 27, 2013 10:40 am Post subject: |
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| km987654 wrote: | | Corleone88 wrote: | | Yes and I already have one, but I don't see how it can help me adjusting my G2s. |
Don't these devices provide proper grey scale which in turn requires correct G2?? So can't you simply adjust G2 to obtain correct grey scale?? |
I agree if you are talking about white/black balance between R, B and B. But my problem is more about what intensity of light should I have from the G2s? I can have a well balanced black (R/G/B) but it can be too light or the opposite.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Mon Apr 01, 2013 9:13 am Post subject: |
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Well I am back with my blacks problem. I managed to get my old configuration back (i.e without Greg's modification) in order to check if it was something from Greg's modification. I also put another G2 board with differents pots (very sensitive ones). So I put the original RGB amps with green LED. I turned the ABL on, went to service menu->G2 and turned the pots until the LEDs are turned off. I checked the rasters with a 0IRE picture (lum = 50 and contrast = 50, color temp = 6500) and they are very luminous.
I watched the black bars and needed to set the luminosity to around 30 in order to get it right.
So now I am more confused that before  .
What is wrong in my system?
Why my green leds gone off when G2 values are high?
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Tue Apr 02, 2013 7:35 am Post subject: |
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Your G2 are probably about right.
Brightness might be bit high at your source or...
Is there still modded input and driver boards installed?
It's possible that those have effect to brightness level.
It doesn't matter that brightness need to be at 30, if you get full black and all gray shades are there.
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Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
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| Posted: Tue Apr 02, 2013 8:10 am Post subject: |
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Ile,
I removed all modified cards. I realized yesterday that my source was too bright (I tested on my Pioneer TV and had the same problem as on the BG808).
Then I put back the modified cards except for the RGB amps (to keep the ones with green leds). After adjustment, I needed lum = 38 to get black bars clipping ok. But at 0 IRE, I am not sure that my black is ok and I cannot remember how dark it was or as it should be. I have a Display 3 Pro but I don't know if it can help me or not about measuring my black level.
| Quote: | | It doesn't matter that brightness need to be at 30, if you get full black and all gray shades are there. |
I agree with you but I would like to be sure to have a correct black at 0 IRE and lum=38.
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