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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Thu Nov 05, 2015 8:38 pm Post subject: |
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Wel I dug up the connector pinout, and condluded that aside from extra data output on the PG+ system board, the pinout is the same. Fingers crossed I swapped system boards. The PJ fired up, but I got very low if any osd signal yet again... Convergence was jumping about somewhat so I kept it short.
Swapped the original system board back in, fired it up again. This time I got acceptable brightness from all tubes... then swapping to my copied input and back, I noticed that AKB is behaving strangely... after turning the PJ on, I got pretty good color balance straight on, yet after switchign back and forth between my original and copied video input, I have to press kelvin to get good color balance again.
Originally, when I fired up the PJ for the first time, pressing kelvin didn't bring AKB on! Adjusting the sliders, I couldn't get the white square pattern to be white, just barely gray! I saved those settings to my copied video input, yet bringing up the kelvin menu shows 0-0 on all sliders!
Very strange behavior... having said that, the colour issue is probably not a system, nor a video out PWB fault... but then that leaves... what... ? I can imagine the ribbon cable connecting the two cages to have contact problems I guess...
_________________
Watching atm: Barco Cine 8 Onyx (HD-18 modded)
Working on atm: Barco 808s --> Cine8 Onyx conversion
Retired/shelved units: 2xNEC 9PG, 2xNEC 6PG Plus, Barco Vision 600, Sony VPH-1021
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Thu Nov 05, 2015 8:50 pm Post subject: |
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After running AKB save your adjustments, then switch back and forth between presets. By the way you can leave AKB on all time, if you want.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Thu Nov 05, 2015 9:13 pm Post subject: |
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| gjaky wrote: | | After running AKB save your adjustments, then switch back and forth between presets. By the way you can leave AKB on all time, if you want. |
I don't really want to mess with anything until I figure out the actual problem, but at this point it's got to be either one of the connectors, or the ribbon cable... will wire out the RGB OS lines on both boards as you suggested and compare with the scope.
Is the kelvin setting a global value, or is it saved separately for all inputs?
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Thu Nov 05, 2015 9:15 pm Post subject: |
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| Rattanee wrote: | | Is the kelvin setting a global value, or is it saved separately for all inputs? |
It is saved for each preset separately.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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hansilili
Joined: 09 Mar 2007
Posts: 302
Location: Köln, Germany
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| Posted: Fri Nov 06, 2015 8:21 am Post subject: |
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Call me stupid but hat once had really bad headaches until by accident I found out, that the BNC connectors had bad contact. Wrapping someone piece of aluminum foil around all 5 plugs solved the problem.
All issues you are reporting occur without external videosignal beiing fed, right? So the RGB input board is not involved, is it?
CHeers
hansilili
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HansA, alles andere ist euer Bier!
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Fri Nov 06, 2015 1:43 pm Post subject: |
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| hansilili wrote: | Call me stupid but hat once had really bad headaches until by accident I found out, that the BNC connectors had bad contact. Wrapping someone piece of aluminum foil around all 5 plugs solved the problem.
All issues you are reporting occur without external videosignal beiing fed, right? So the RGB input board is not involved, is it?
CHeers
hansilili |
I have video in through the composite input, but the problem is present on internal test patterns, and menu screens with or without the decoder board, or input signal. I will test in the evening with a scope, but at this point, this has to be a problem with either one of the mother pwbs, or the ribbon cable connecting them...
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Tue Mar 08, 2016 8:27 pm Post subject: |
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So I went through everything, and had to conclude that the G2 pots were twisted all over the place... :\ After doing the "CRT TV G2 adjustment method" (set contrast and brightness to default, bring up g2 until raster shows with no input, then lower it until it just disappears) for all three colours, the colour balance seems good. I installed my spot-burnt green tube (just a very tiny spot, still anonying though) and the new blue and red that I managed to salvage from Curt's shipment. I found a forum member who has a PG9 plus, and hopefully i will have the eprom images soon, so I can do a full conversion to PG9 plus.
So with the new tubes mounted, I dialed cpc in until the crosshatch "wasn't too hazey" on the CRT face, then proceeded to do the centering magnets... where I got a not-so-friendly zap from something. I pulled my hand out, and heard a few more arcs before it went quiet again. There was no visible distortion on the test pattern on the tube during the arcing. Would this suggest the yoke windings worn, or is it possible that there is this strong a static charge in that area? I'm going to grab some rubber gloves and try again with them on... I don't suppose the yoke voltage would jump through the rubber gloves used for cleaning would it?
_________________
Watching atm: Barco Cine 8 Onyx (HD-18 modded)
Working on atm: Barco 808s --> Cine8 Onyx conversion
Retired/shelved units: 2xNEC 9PG, 2xNEC 6PG Plus, Barco Vision 600, Sony VPH-1021
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Zolzar
Joined: 26 Jun 2009
Posts: 252
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| Posted: Tue Mar 08, 2016 11:00 pm Post subject: |
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I am no expert but the sounds like a grounding issue.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Wed Mar 09, 2016 5:56 am Post subject: |
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| Zolzar wrote: | | I am no expert but the sounds like a grounding issue. |
Yeah, actually the lack of it.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Rattanee
Joined: 18 Jan 2015
Posts: 193
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| Posted: Fri Mar 11, 2016 8:40 am Post subject: |
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A grounding issue? The strap is installed on the tube and conducts properly, I checked that before installation. Form then on it's the metallic frame... so there's not much else in the way of grounding... or is there something else I should check?
_________________
Watching atm: Barco Cine 8 Onyx (HD-18 modded)
Working on atm: Barco 808s --> Cine8 Onyx conversion
Retired/shelved units: 2xNEC 9PG, 2xNEC 6PG Plus, Barco Vision 600, Sony VPH-1021
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