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karmat63
Joined: 19 Dec 2007
Posts: 157
Location: Italy
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| Posted: Thu Nov 05, 2009 4:25 pm Post subject: Lumagen PED V |
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Going through Lumagen HDP service menu, I found a submenu named PED V.
Anyone knows what is it for? Could it be useful in CRT greyscale calibration?
Thanks.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Nov 05, 2009 4:51 pm Post subject: |
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Abbreviations are usually manufacturer specific. If a service manual was available it would probably confirm what it meant.
If I were to guess, it may mean vertical phase encoder. Changing the value would move to image up and down.
Of course I'm not saying to mess with it because if its something else, your device could stop working.....
Service menu's are risky areas.
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PaulB
Joined: 26 Oct 2007
Posts: 359
Location: Bonnie (but rainy) Scotland
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Fri Nov 06, 2009 10:40 pm Post subject: |
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The default for the PED V level is 60.
The default for the WHT V level is 1021
From the Dealer Training Manual:
| Quote: | OUTPUT VOLTAGE CALIBRATION (Enter service mode then MENU ® OUT ® LEVL ® ) :
Service mode adds an extra entry for OUT->LEVL to set both the output black pedestal voltage and the output white
voltage. We strongly recommend you NOT change these, since these values are considered factory settings and have
a special "BURN" process to make any changes permanent. There is a "BURN" entry in the service MENU near the
LEVL entry. Select this BURN entry and press ENTER to update the FLASH ROM with the new levels for pedestal
and white voltages. The BURN step cannot be undone, but new values can be BURNed multiple times if needed." |
_________________
MAIN THEATER: (JVC RS2000; Yamaha UDP-LX500; Yamaha RX-V2400; Lumagen Radiance Pro, Vertex)
SECOND WII-ATER: (BG808; WII; Oppo 971H; Moome external box; BG-DVI transcoder; tse gamma box; Extron)
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karmat63
Joined: 19 Dec 2007
Posts: 157
Location: Italy
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| Posted: Sun Nov 08, 2009 2:06 am Post subject: |
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Thanks for your answers; I knew the default values for PED V and white V.
But I'm wondering if changing PED V values could be useful in grayscale calibration of my Marquee 8500. I try to be clearer: if I put brightness to zero and then slowly go up, I see that the 3 CRT don't light at the same moment, being the green the first, than the blue and last the red. I know some VP (i.e. Barco) have specific trimpots making the 3 CRT to light at the same time, acting, I think, on black pedestal. Marquees lack this possibility, so I thought that, by Lumagen PED V regulation (that is separate for R, G, B), you can do the same thing...
Any opinion?
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Sun Nov 08, 2009 2:34 am Post subject: |
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| karmat63 wrote: | if I put brightness to zero and then slowly go up, I see that the 3 CRT don't light at the same moment, being the green the first, than the blue and last the red. I know some VP (i.e. Barco) have specific trimpots making the 3 CRT to light at the same time, acting, I think, on black pedestal. Marquees lack this possibility, so I thought that, by Lumagen PED V regulation (that is separate for R, G, B), you can do the same thing...
Any opinion? |
Why do all three tubes have to light at the same time? As long as the G2 isn't messed up then it may not be a problem. As long as G2s, black levels, gamma, and gray scale are ok then it shouldn't matter should it? Experts here will probably skewer me for some obscure reason but I have a BG808 that is dialed in with a color meter REALLY well and all three tubes on mine don't come on at the same time. I think it's OK. Green is 60% of the light and in my case comes on when there is a 10 IRE image whereas blue and red are hardly (if at all) lit.
Anyways, the Lumagen manual I quoted above is very clear that this setting should NOT be changed unless...unless what I don't know. But I wouldn't change it. It isn't a "normal" thing to be messing with anyways. My 2 cents.
_________________
MAIN THEATER: (JVC RS2000; Yamaha UDP-LX500; Yamaha RX-V2400; Lumagen Radiance Pro, Vertex)
SECOND WII-ATER: (BG808; WII; Oppo 971H; Moome external box; BG-DVI transcoder; tse gamma box; Extron)
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karmat63
Joined: 19 Dec 2007
Posts: 157
Location: Italy
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| Posted: Tue Nov 10, 2009 1:08 am Post subject: |
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In his tutorial "Grayscale and Color calibration for dummies", Kal wrote:
"STEP 3.3 (CRT projector owners only): Make sure your projector's G2 (aka 'Grid 2') for each tube is set up correctly. There is usually one G2 pot for each tube inside the projector. Check your owner's manual for the procedure used to set up G2. The G2 controls set the point at which each tubes 'turns on' or starts to emit light. It's important to get all 3 tubes to turn on at the same time to get proper greyscale in the darker regions. You can check that all 3 tubes are lighting up at the same time by slowing turning up the brightness while displaying the black (0 IRE) pattern on the Digital Video Essentials: HD Basics test disc. It's available by choosing menu option "Complete Program Menu" -> "Advanced Video Test Patterns" -> 1080p or 720p -> "Video Black w/ new PLUGE". Make sure all 3 tubes light up at the same time. If you're not sure what this step means or uncomfortable sticking your hands in the projector, just leave the G2 pots alone. Odds are that the G2 is set pretty close to correctly.".
That's the reason I asked about the possibility to control the point at which each tube turns on by Lumagen
I agree that, even without this control you can reach very nice results, using a good color meter, as I did, but I was just courios if anyone has checked this possibility that Lumagen service menu offers
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