CurtPalme.com Home Theater Forum

[Nashou66]

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so 511 feedback and 393 Gain?

I'll try those or something close depending on what I have.

Nashou

[Nashou66]

Steve did you use the 695 on an 02 or 03 vim?

Nashou

[Nashou66]

Pics back up for the LVPS cap upgrade that Jea Hong Lea did.

First page of this page has the direct links.

nashou

[CxTurbo]

Nash,

Any thoughts on adding a radial Wima film cap in parallel to the decoupling caps in the CLM versus replacing the ceramics entirely?
I was also thinking of doing the same in the VIM as there are various decoupling caps shown that could benefit as well as adding some power filtering to the IC's directly.

There are also a number of other IC's that we replaced on other boards on the VIM, albeit in SMD packages. I know the VIM is pickier with IC changes from reading so what say you on the TL0's etc that exist on the VIM?

When you added Clarity Caps to JB's HVPS did he notice any improvement?

I just got a two channel scope as well. Maybe now someday I can start to work on the issues I have with all those VDM's I killed LOL!

Lastly, I am still having an issue similar to what you had where vertical and angled lines become jagged every so often. Getting worse on brighter lines white especially. This is the only thing driving me nuts now. Any thoughts on where this is originating othe the the Stig board on the back sink? I have yet to do my CLM at all. I have started on the VIM but got as far as installing the 3 IC's mentioned.

These mods we have discussed here have brought life back to the old girl and they have improved the resolution of the image greatly. However I think I am going to have to resort to floor mounting my machine as the tented ceiling in my theater will not allow me to mount the projector close enough the get full raster usage.

James

[Nashou66]

Hi James, I have been actually researching parts, caps in particular for the CLM. Panasonic makes new SMD OsCon hybrid cap i was going to add on top of the ceramics already there or do as I did before and remove them and add the OsCons, these are very low ESR caps and form previous experimentation I love OsCons for filtering. these are B1 and B2 case sizes, there are I think 4 SMD's between some closely placed chips where they wont fit. I am iffy on the Ceramics to be removed, they do filter out high frequency but might have a piezo effect, this is what I learned form some readings on companies application notes.

Justin has not really gotten to do much analysis as he has a few other things he was working on, the dreaded faint line on the vim.

With the squiggly lines pulsing every few seconds it is the timing to the Marquee the H-sync has to be larger than 1us, any lower you get those squigglies.

I am looking at using those SMD Oscons on the Vim as well. now these are the box type SMD not the cans.

Athanasios

[CxTurbo]

Is that timing something I can adjust?

Great news on the other stuff. I will keep my pants on for the time being. Although I might just do the Panasonic's like we discussed earlier.

Thanks

James

[Nashou66]

Yes, in the Radiance, you have a mini correct?

Athanasios

[CxTurbo]

yes I do. I will have to look into it then.

[CxTurbo]

Nothing in the manual that indicates how to increase the H frequency.

I assume that I need to do this in the custom timing menu and adjust the H frequency above 1MHz?

[Nashou66]

the H sync need to increase most likely, but the radiance does it in a new way now I think, before you could just alter numbers now it is different, not sure.
I never had to use this with my blend set up as the tv one does the timings for me.

Athanasios

[CxTurbo]

Maybe Craig will have some insight.

Thanks Nash.

[Nashou66]

Jorge, Back to your VDM POOGEing( Progressive Optimization Of Generic Electronics)

For the 150uh do you think 190-220 would be ok? I have a bunch of those value, they are 220uh but I measured a few and most are about 180-190uh.

Aslo did you change the 1n4003 diodes to the soft recovery ones I listed?

I have to try to repair Justins VDM and CVA and want to try your alterations as well.

I ordered the Flyback from the source James listed so have to wait for them. James how long did it take from china?

I also am thinking about those film SMD caps for all the CLM caps for each chip and the VIM as well,
On the CLM I would do a stack of 150nf( they do not have 100nf) 1uf in film and then add the
47uf PosCons.When I did the CLM mod with the 47uf tants there was no issue at all.
And for the Vim the same value with the Film SMD's but add a 4.7uf PosCon SMD's,
and also replace every other tantalum on the CLM and VIM with the same size case but higher
uf value , how much would depend on the location for what ic they are for. I'd go as large as possible
on the input voltage rails but then just a next value up everywhere else. the specs on the PosCons are
great for ESR and Ripple current for a SMD cap. I feel SMD's are the way to go as they keep the intention
of the original PCB layout in mind. Using radial caps adds parasitic capacitance that can affect the circuit
detrimentally but it is not always the case.

PosCon values and the different series they come in.

http://www.mouser.com/catalogviewer/default.aspx?page=3068&highlight=667-6TPU47MSI&catalogculture=en-US&catalog=646

Wish they went higher in voltage and values. I have used Tants of 6.3 volts on the 5 volt rails with no issues, so I wonder how these would fare?

on the 15 volt rails i would not try 16 volt one but the 20vdc ones .

Not sure what surge voltages those rails can produce but 6.3 volts can take a surge up to 7.2 vdc.


Athanasios

[barclay66]

[Nashou66]

I understand about the 15 volt rails and the 1mH, but for the 5 volt rails you list 150uH so would the 220uH ones I have that measure about 180-190uH work for those rails?

Ok so the film SMD caps would be fine for the 5 volt rails for the chip decoupling caps .

Now what about those PosCon caps they are more like OsCons than tants. And since i put hundreds of hours with the 6.3 volt tants
on another CLM i had with no issues I still wonder if these new style caps would hold up better than tants.

I guess I could try and find out

And are those Shields over those ic's?

nashou

[Nashou66]

I also noticed you used sockets for the op amps, did that affect the operation at all?

Nashou

[barclay66]

[mp20748]

[Nashou66]

I too mike was looking at the smaller SMD inductors. I see you added them at each Channel. Think that might be overkill or is it necessary?

Also those Black 33uf tants, look like 16 volts correct?

Athanasios

[mp20748]

The use of the inductors was very necessary to decrease the high frequency noise from getting into the vert, CVA and Stig amps and vice versa.

There is a ton of noise on the rails, some get's there directly from some of the modules, so in better decoupling the modules, I was able to lower the overall noise on the rails. With the bigger benefit being better performing boards (vert,stig, cva) on the large heatsink, because the high frequency noise that rides on the rails also gets into those amplifiers, and they actually amplify some of it.

I'll take a picture inside of one of my CRT's later (need batteries for my camera) and you'll see why those inductors are needed. Without them, I would not be able to get those super small and tight one pixel lines at the 1920X1440 /60hz resolution (234mhz).

At the higher scan rates, the cleaner the DC is on the amplifiers, the more defined the image will be.

Actually, the noise that is solved from when I put the jumper on the convergence board to ground, is to help suppress the noise that is being transmitted (onto their cables and back onto the rails) by those amplifiers. So with the inductors in place, there's no need for the jumper. Plus with the amplifiers not transmitting that noise anymore, the amplifiers run cooler and there's less noise is in the image.

Yes, the tants are 33uf/16v

[CxTurbo]

My Flybacks only took 2-3 weeks from the day of order to my door. I ordered a bunch of chips from UT Source and one of them held up shipment a bit.

I have not touched much at all on my PJ. So if you are planning on implementing some of these things I will be watching closely.

Jorge Thanks as always for sharing.

You too Mike. Thanks for sharing.