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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Sep 26, 2010 8:41 pm Post subject: |
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no i am talking about the 0.1uf that replaced the 100nf ceramic non polarized decoupling caps on the 15v rails.
when the 0.1uf tants are in place no leds light up but when i add the 22uf on top of the 0.1 uf the horizontal led lights up a second before the pj turns on.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Sep 26, 2010 8:43 pm Post subject: |
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i have a feeling that changing them on the hdm might be a nice improvement, sent me a few if you will.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Mon Sep 27, 2010 7:00 pm Post subject: |
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| dvh99 wrote: | no i am talking about the 0.1uf that replaced the 100nf ceramic non polarized decoupling caps on the 15v rails.
when the 0.1uf tants are in place no leds light up but when i add the 22uf on top of the 0.1 uf the horizontal led lights up a second before the pj turns on. |
post a pic?
| Nashou66 wrote: | Thanks Drags, I also think it be even better to change the two that are connected together D13,D11 and D18 and D19. These are directly tied into the video circuit and less noise here would probably be the biggest improvement out of any mods tot he VNB Id think. Just lookat the noise levels generated fromt he 1n4004's in the POOGE article. I think this would be directly seen in the video signal . That is part of the cascading amps so i think lowering the noise floor level
here would clean up the image really well. I have a feeling the sparkles you can see on full fields are caused here and amplified. We are always trying to clean up the noise on that 85 volt rail and seem to forget that noise can be created beyond the voltage input and right in the amp circuit . I have not done this mod yet but have about 200 of those diodes. There is another place where soft recovery can help but its not just simple diodes 
Athanasios |
sweet, I completely forgot about those 4, sticking up and hard to see when looking down  i'm going to try this on a VNB on my test chassis and report back.
EDIT: can't find these anywhere SBYV27-200-E3/73. Newark has a 7 day direct ship from the UK with $20. handling fee and $.63 each. Any better deals out there?
Last edited by draganm on Mon Sep 27, 2010 7:31 pm; edited 1 time in total
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Mon Sep 27, 2010 7:16 pm Post subject: |
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| draganm wrote: | | A quick look shows the ESRD caps biggest weakness is their low voltage rating at higher values. Fos instance, going to just a basic 10uf rating gives you a max voltage rating of 6 volts. So it appears the ESRD's are not capable of actually replacing most of the Solid tant's on the VIM or VNB's. |
ok this is wrong, not sure why it didn't come up the first time but they do offer a 10uf 16V SMT style Aluminum Organic Polymer Capacitors . They're not ESRD but instead ECAS. Ultra low ESR of 60mOhms. Anyone ever tried these in the video chain?
http://www.mouser.com/ProductDetail/Murata/ECASD41C106M060K00/?qs=ARJTbBigCIwQyIIT4HKIHQ%3d%3d
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Mon Sep 27, 2010 7:44 pm Post subject: |
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| Nashou66 wrote: | Like all these organic polymers they are bound to a larger case because the technology is not there to make them smaller. I want "a" sized case oscons!!!
Athanasios |
well the ones I linked to above are only slightly larger than the solid tant's found throughout the VIM and VNB's. Looks like D size vs. C for the stock ones?
What about those diodes, do you know an inexpensive source for them ?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Sep 27, 2010 9:40 pm Post subject: |
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| draganm wrote: | | Nashou66 wrote: | Like all these organic polymers they are bound to a larger case because the technology is not there to make them smaller. I want "a" sized case oscons!!!
Athanasios |
well the ones I linked to above are only slightly larger than the solid tant's found throughout the VIM and VNB's. Looks like D size vs. C for the stock ones?
What about those diodes, do you know an inexpensive source for them ? |
Well for replacing the tants they are the same size. But i want to use them for every 1206 sized Cap on the CLM.
Oscons are excellent for cleaning up digital hash noise I am told. SO putting one in place of or on top of the 100nf ceramics would really help out. the 47uf tants i used on my test CLM really helped as Dennis also noted, Oscons would be even better.
Athanasios
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Oct 09, 2010 2:02 am Post subject: |
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Notice, My .Mac home page that stores many of the pictures on this thread is going to be over and the pics will not be accessible . SO i have to move them to my Web Gallery and create a Gallery for them. It might take some time so i apologize if they are not there.
It ends on November 10th, I'll try my best to move them all and re edit each post so the pics get the new web gallery address.
What A pain !!!!!
Athanasios
_________________
Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
One Smart Dog!!!
Marquee High Performance Bellows now shipping!!
Marquee Modifications and Performance Enhancement
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vinm
Joined: 06 Oct 2010
Posts: 18
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| Posted: Mon Oct 25, 2010 7:33 pm Post subject: |
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Hi
This is my first message on this forum also if i search through it sometimes, when my passion for crt projectors raise again.
Now I'm trying to fix my marquee 8250 (an 8000 revamped with some 8500 modules...).
I'm religiously read all maintenance thread, and started to fix my broken Convergence board.
I noted that in this post http://www.curtpalme.com/forum/viewtopic.php?p=142218#142218 Nashou said that he replaced
"6 4N7(4.7nf) Mylars and use Wima polypropylene caps" and put the link for Mouser part
But in the pictures (and the Mouser part) the caps are 0.047uF that equals to 47nF  (I also checked using his link for conversions)
So my question (mainly for nashou) is : It's good to replace with 47nF (i ordered directly using mouser part number!) or I have to use exactly 4n7 ?
Vincenzo
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Mon Oct 25, 2010 7:47 pm Post subject: |
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| vinm wrote: | Hi
This is my first message on this forum also if i search through it sometimes, when my passion for crt projectors raise again.
Now I'm trying to fix my marquee 8250 (an 8000 revamped with some 8500 modules...).
I'm religiously read all maintenance thread, and started to fix my broken Convergence board.
I noted that in this post http://www.curtpalme.com/forum/viewtopic.php?p=142218#142218 Nashou said that he replaced
"6 4N7(4.7nf) Mylars and use Wima polypropylene caps" and put the link for Mouser part
But in the pictures (and the Mouser part) the caps are 0.047uF that equals to 47nF (I also checked using his link for conversions)
So my question (mainly for nashou) is : It's good to replace with 47nF (i ordered directly using mouser part number!) or I have to use exactly 4n7 ?
Vincenzo |
Nice Catch Vincent!!
I just noticed i made the mistake.
I have used that CVA for a long time after the changes and never noticed any thing out of the ordinary.
However I think it be best to use the correct vale of 4.7nf or .0047uf. My cap value was wrong.
I have to look back on my order history, i wonder if i just clicked the wrong part number or they sent me
the wrong part. It has happened a few times . Newark sent me 22uh inductors instead of 220uh once.
Thanks for the heads up Vinne!!
I also have to re do the pics as next month many will not have the correct link, apple homepage is being discontinues in favor of the new Web Gallery iPhoto uses.
lots of work for me!! Yeah!!! NOT!!! 
Athanasios
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Don't blame your underwear for your crooked ass~ unknown Greek philosopher
"Republicans believe every day is the Fourth of July, but the Democrats believe every day is April 15." --- President Reagan
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vinm
Joined: 06 Oct 2010
Posts: 18
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| Posted: Mon Oct 25, 2010 8:58 pm Post subject: |
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Thanks for your quick answer!
Looking in the schematic I suspected that was better to not change cap value (not sure about their function , but doesn't seem for decoupling porpouses)
So, I have to wait for a new order or using non Wima caps. ( or use the wrong value ...)
Btw if I understand well, you used CVA in a normal way without any problems.
I'm trying to do some pics of my work with board, if could be useful as documentation, i'll post in this thread.
Anyway , you have done an excellent work with marquees as documented in this thread, so....
 MANY THANKS FOR YOUR HELP!!!
Vincenzo
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Nashou66
Joined: 12 Jan 2007
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vinm
Joined: 06 Oct 2010
Posts: 18
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| Posted: Tue Oct 26, 2010 4:56 pm Post subject: |
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I checked service manual and it reports:
"The input stage low pass filter controls the bandwith of the amplifier.
When digital control LPF1 is high, MOSFET Q111 switches C121 into the circuit,
reducing bandwith to 400Khz. This is tipically done at low horizontal scan rates
(<37KHz) in order to filter out quantization artifacts from the digitallly generated
convergence waveform input."
I think that you haven't found any problem because you normally use 1080p resolution.
Is correct ?
Btw I think that i'm going to use correct value , non wima caps
Vincenzo
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dvh99
Joined: 25 Dec 2009
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Location: nederland
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vinm
Joined: 06 Oct 2010
Posts: 18
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| Posted: Tue Oct 26, 2010 6:16 pm Post subject: |
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Thanks dvh99
But the indicated caps are 63V and 250V, on the schematic the caps are 100V , I think that one is too small in voltage, the other is too large (in voltage of course)
I would use correct value 4nt/100V , my only doubt is if Wima are necessary in this case or I can go with bulk polypropilen caps
Vincenzo
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Oct 26, 2010 6:22 pm Post subject: |
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dont think so its on the 24volt rail.
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marquee 9500ultra HD10L moome hdmi1.3 v3+ some mods.
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vinm
Joined: 06 Oct 2010
Posts: 18
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| Posted: Tue Oct 26, 2010 6:48 pm Post subject: |
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Sorry, maybe there's a misunderstanding, I'm talking of 6 caps C121, C221, C321, C421, C521. and C621
On my schematic 00-262330-01P are all indicated as 4N7 100V 10% 
dvh99, are you refererring to other caps ?
Vincenzo
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Tue Oct 26, 2010 6:52 pm Post subject: |
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no misuderstanding the caps you indicate are on the 24volts rail.
electrohome bought those 100v in bulk probably or had them lying around, no problem to use the 63v.
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1 answer always poses multiple questions.
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Nashou66
Joined: 12 Jan 2007
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vinm
Joined: 06 Oct 2010
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| Posted: Tue Oct 26, 2010 7:04 pm Post subject: |
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Ok, now it's clear, i remember of an old post that said about the use of not exact values from Electrohome to use what they already had in store.
Athanasios, only to raise the confusion , do you mean 47nF ?
Vincenzo
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