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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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 Link Posted: Thu Jun 14, 2012 4:52 pm Post subject: |
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| ronaldus wrote: | Hi everybody,
I just want to post back on the HDM board that i bought from ebay.
I've tested it today (with my own daughterboard and it works better then my own board. I can now fill the phosphor with a 50hz refresh rate and on top of that there are no more vertical lines on the left side of the screen (ringing or banding?)
I'm happy with it and will check if some maintenance mods still have to be done.
regards,
Ron. |
great news!! Its Ringing , those vertical lines on left side.
Nashou
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Marquee Modifications and Performance Enhancement
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Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
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| Link Posted: Wed Dec 19, 2018 7:45 pm Post subject: |
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Sorry for bumping a dead thread, but I'm intrigued.
I'm getting pretty drastic ringing at 1080p 72hz. I'm also lacking with the H Width for maximizing the raster. I found out that running on "short" retrace helps for width, but this solution seems so much better.
MP's pictures on the first page have died. Can I just take the high band coils out and put a jumper on the 1 and 3 pin? +1 if it can be done without a smoke cloud 
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barclay66
Joined: 27 Jun 2011
Posts: 1291
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Link Posted: Wed Dec 19, 2018 8:37 pm Post subject: |
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Hi,
Removing them is safe. Any smoke after correct modification would be originating from somewhere else...
Kind Regards,
barclay66
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Thu Dec 20, 2018 8:42 am Post subject: |
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| ronaldus wrote: | Hi again,
I'll try to post a picture when I'm home from work. It's only the 3 relays for the width coils that are taken out as far as i could see.
I've attached a screenshot of the picture from Ebay but it's not very clear but i think you can see which coils have been removed.
I think myself that it has been modified for High scan rate (1080P etc)
two better pics added
regards,
Ron. |
Old post, but for the point, that is a factory HDM, from a 8/9500DM machine, that was a for dome installations with more convergence range (pre ULTRA days). But to overcome the increased heat dissipation of the increased convergence range they deliberately limited the scanrate to 70kHz or so, it was done by completely removing the high-scan switchover relays (and therefore width coils), I think the small signal daughterboard was also modified accordingly.
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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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ronaldus
Joined: 25 Dec 2010
Posts: 183
Location: france
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| Link Posted: Thu Dec 20, 2018 9:56 am Post subject: |
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Hi Gjaki,
I think you are right my board looks like it was modified in the factory.
I'm checking the schematic now and also the picture of my HDM as shown in this thread and If I am not mistaken the two yoke coils are permanently in parallel but since I don't know the pin out of the relay I cannot really figure it out from the picture. If I had the model number of the relay I could find it out. I could check this tonight when I'm home because I still have the old HDM
I'm using this board with a standard HDM daughter board and it works perfectly fine with 1080P 50Hz Then we are in the high scan range isn't it?
Regards,
Ron.
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Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
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| Link Posted: Thu Dec 20, 2018 10:31 am Post subject: |
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Pardon for interference but a quick update:
Took the coils out, jumped the pins on all 3 and well... it didn't help with the ringing (I'm on short retrace). On long retrace theres zero ringing but I have to push the H size all the way to 100 to fill the tubes 
I've played with the HDM jumper as well, no luck.
Something wrong with the board? Maybe incompatibility with otherwise ultra chassis?
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Thu Dec 20, 2018 11:28 am Post subject: |
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| Meemil wrote: | Pardon for interference but a quick update:
Took the coils out, jumped the pins on all 3 and well... it didn't help with the ringing (I'm on short retrace). On long retrace theres zero ringing but I have to push the H size all the way to 100 to fill the tubes
I've played with the HDM jumper as well, no luck.
Something wrong with the board? Maybe incompatibility with otherwise ultra chassis? |
As of now there is no "magical ringing eliminator" mod, and in short retrace some sort of ringing normal, but it is difficult to say how much is normal, a picture of your rough projected picture would be helpful here.
It is possible that a certain HDM produces more ringing than an other, but that would be because of a latent problem with the board, there is no known compatibility issue in this regard.
_________________
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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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Thu Dec 20, 2018 12:10 pm Post subject: |
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| ronaldus wrote: | Hi Gjaki,
I think you are right my board looks like it was modified in the factory.
I'm checking the schematic now and also the picture of my HDM as shown in this thread and If I am not mistaken the two yoke coils are permanently in parallel but since I don't know the pin out of the relay I cannot really figure it out from the picture. If I had the model number of the relay I could find it out. I could check this tonight when I'm home because I still have the old HDM
I'm using this board with a standard HDM daughter board and it works perfectly fine with 1080P 50Hz Then we are in the high scan range isn't it?
Regards,
Ron. |
I also have such a HDM, altough mine already had been cannibalized when I got it, so I never bothered to put into a projector.
Apparently the service addendum for the 9500DM projector differentiates two product runs, pre 1997 november, and past that. The pre 1997 november models were limited to 65kHz scanrate, and I seem to remember that there is an additional notice that these earlier projector may be damaged if higher scanrate is applied. No surprise as the coils are hard wired for series operation.
Looking at the pictures there is a datecode on the PCB near RL2, that says 50-96 (1996 week 50) -same as on mine, so that board is from the early run for sure. The later projectors had the relays again and they change yoke configurations accordingly, the limitation was put probably in the software instead, to save on labour costs, or whatever.
1080P 50Hz is about 56kHz scanrate, so that fits to the 65kHz limitation.
_________________
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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nidi
Joined: 17 Aug 2008
Posts: 303
Location: Switzerland
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| Link Posted: Thu Dec 20, 2018 5:58 pm Post subject: Re: How to get more H WIDTH out of Marquee (1080P) |
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| mp20748 wrote: | | And at the same time, also solve that dreaded ringing issue on the left side of the screen when running 1080P (60/72hz).. |
it's so funny reading this first post from Mike having solved the ringing issue so long back and still seeing
screenshots posted over on AVS still having this issue.
isn't he just the greatest artist out there?
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ronaldus
Joined: 25 Dec 2010
Posts: 183
Location: france
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| Link Posted: Fri Dec 21, 2018 7:21 am Post subject: |
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Hi Gjaki,
Thanks for your reply. So if I understand well if I dare to feed more then 1080P 50hz (like 60P or 72/75P) then poof!
Good to know.
Then something else about not getting enough width.
I think it has to do with the MOD SUPPLY voltage (see HDM schematic) that feeds the horizontal size correction circuit (3rd page of HDM schematic) when I had the problem with my other HDM it was as if this amplifier was saturated. If I took the famous jumper out to get more width it just saturated at a lower setting for the H width setting. I didn't want to experiment with this because I didn't want to burn my tube by messing with the deflection circuit.
Any way what is your opinion about that?
regards,
Ron.
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mp20748
Joined: 12 Sep 2006
Posts: 5681
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Link Posted: Fri Dec 21, 2018 11:27 am Post subject: Re: How to get more H WIDTH out of Marquee (1080P) |
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| nidi wrote: | | mp20748 wrote: | | And at the same time, also solve that dreaded ringing issue on the left side of the screen when running 1080P (60/72hz).. |
it's so funny reading this first post from Mike having solved the ringing issue so long back and still seeing
screenshots posted over on AVS still having this issue.
isn't he just the greatest artist out there? |
Go back and read the thread without malice.
Naw, I'm not the greatest artist out there, or wouldn't even consider myself an artist at all, but thanks for thinking of me that way..
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gjaky
Joined: 05 Jun 2010
Posts: 2790
Location: Budapest, Hungary
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| Link Posted: Fri Dec 21, 2018 12:37 pm Post subject: |
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| ronaldus wrote: | Hi Gjaki,
Thanks for your reply. So if I understand well if I dare to feed more then 1080P 50hz (like 60P or 72/75P) then poof!
Good to know.
Then something else about not getting enough width.
I think it has to do with the MOD SUPPLY voltage (see HDM schematic) that feeds the horizontal size correction circuit (3rd page of HDM schematic) when I had the problem with my other HDM it was as if this amplifier was saturated. If I took the famous jumper out to get more width it just saturated at a lower setting for the H width setting. I didn't want to experiment with this because I didn't want to burn my tube by messing with the deflection circuit.
Any way what is your opinion about that?
regards,
Ron. |
Both could be problematic, the scan regulator supply (page 4) is a basic DC-DC converter with current limit and current feedback, an out of spec resistor at R91, R93, R96 may lead to decreased H amplitude. The easiest would be to compare the output voltage of the scan regulator to a known good HDM (the other one) with the same H-width setting and scanrate. If that is reasonably similar then there is a weakness in the modulator amplifier (page 3).
The safest way to play with deflection is to do the things blindly, pull the P14 plug.
_________________
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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Meemil
Joined: 25 Mar 2016
Posts: 96
Location: Finland
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| Link Posted: Fri Dec 28, 2018 12:35 am Post subject: |
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Here's an interesting observation what I think could have to do with taking out the coils. Normally my C h-linearity setting was good around 25 but with this new setup (including the modded HDM) I have to push it all the way to around 2 for perfection. Doesn't bother too much as I have the required adjustment, but interesting nonethless.
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