CurtPalme.com Home Theater Forum

[the_maniac]

Hi,

I always thought my 9500 isn't remembering convergence very well but just found out that's all about warming up, knew it already but didn't do it most of the time.

But how and how long do you warm up your projector ? My Barco 808s displayed a full white picture for 20minutes as standard program. But I don't think it's good to start with an fully white picture isn't it ?

So i warm up my marquee whith 10-15 minutes black picture and then 10-15 minutes fully white.

how do you do ?

regards

[Curt Palme]

A fuzzy blanket, slippers, and a warm cup of glycol.

I don't like the all white screen myself, although I've never seen wear due to it.

I simply turn on the set about 15 minutes before watching it, and that does it.

[Curt Palme]

A fuzzy blanket, slippers, and a warm cup of glycol.

I don't like the all white screen myself, although I've never seen wear due to it.

I simply turn on the set about 15 minutes before watching it, and that does it.

[garyfritz]

An all white screen is going to wear your tubes. You might not *see* the wear, because it's probably uniform across the tube face, but any full-on signal produces wear over time. 15-20 mins of 100% white every time you turn it on is just wasteful.

I turn my 8500 on and start watching. The convergence might be off a smidgen at first but not enough to worry about it. Within 10mins or so it's settled in.

If your 9500 needs a warmup period to settle in to a watchable state, just run it with the black screen. Running with a white screen does nothing to help the warmup/stability. You just need to warm up the various cards &etc and you don't need to wear the tubes to do that.

If you have any electronics ability, or know someone who does, you might consider replacing some capacitors. I suspect some old and out-of-spec capacitors are causing your warmup drift. MP or Nashou or Dragan or some of the other Marquee fanatics could probably suggest the best course of action.

[Nashou66]

I do the same as Curt, in about 7 minutes the blend zone is converged properly. And after 15 I found Grey scale stabilizes.

Yeah I'm nerdy, I measured grey scale as soon as I turned it on and then again after 15 minutes and then after 30, then after an hour. no change from 15 to 30 and very slight from 15 to 1 hour.

So i just do everything after 15 minutes, and I use the lumagen warm up function test pattern, its a full field 50% white pattern.

Nashou

[the_maniac]

ok i just thought all becomes warmer when the projector is running on full power (white screen) but if it produces wear i'll stop of course.

when the projector is cold the convergence is about 2-3cm off on my 2,2m wide creen.

already thought about recapping but it's not cheap ...

[Nashou66]

Only red is off for me and about .5 cm.

Id let the PJ warm up loosen all your lens mount bolts that hold the color lens that is off and physically move it to a better convergence tighten it down well, then touch up electronically. I bet it wont bet that far off next time.

its best to loosen up all bolts as well but the one that drifts the most more so you can move it. Be careful retightening so you dont move any other lens mount.

Athanasios

[macgyver655]

I have an Ampro. I dont have to wait for it to warm up. Its ready to go as soon as I turn it on. Everything is right on whether cold or warm.

[perisoft]

[akajester]

Is your son sick? I hope all is well.

[HaydnG90]

Used to use the white screen but now just turn the pj on without a signal for 15 mins before I want to watch anything to warm up the electronics. Everything has pretty much settled down and ready for critical viewing.

[WTS]

I read somewhere that using the white screen for warmup for 20 mins will give you a better/proper looking image sooner, otherwise it can take about 2hrs for the phosphers to stabilize or be at they optimum ( can't remember exactly what was said at the moment).

After the quad blew in my 1200 I was wondering if having it on the warmup screen everytime I started it up may have caused extra stress on the quad which caused it to prematurley fail, not sure on that one but just a thought.

[garyfritz]

I'd want to see a reference for that, Walter. I don't think the phosphor has to stabilize at all. It's the electronics that need to warm up and stabilize. I could be wrong (anything is possible ) but I don't think the phosphor needs any warmup.

[MikeEby]

I can't say about other brands but the on a NEC the convergence will be more stable if you try not to "PUSH" settings hard. Often time you might get interactions between setting, so try to keep things as close to midrange as possible and make sure you start with good mechanical alignment.

I used to let mine warm up for 30 minutes or more, anymore I just turn it on and watch it. It also depends if I have guests over and I want it to look it's best come showtime.

Mike

[WTS]

Gary, no it wasn't the electronics it was somethng about the phosphor. Of course that's the problem now to try and find where I read that. I'll try and remember and do a few searches.

[WTS]

Gary, here it is, actually it was Craig who wrote about it in AVS;

I have always been nervous about the warm up screen running off the tube face on Sony projectors. I don't want to work on a client's machine and then have them later wind up with a possible tube implosion due to the warm up screen. If the warm up screen were to cause an implosion, I don't want a client to think that it was the result of something I did while working on the machine. Because of this, I always turn the warm up screen off on my client's projectors. I also keep the warm up screen off on my own G90.

The point of the warm up screen is two fold however. It does allow the projector to warm up and minimize convergence errors when you sit down to start watching. However, you don't need a white raster for convergence to come back into alignment. If you just run the projector with a black screen, you will find that in 20~25 minutes the convergence will be close to perfect with just a black field.

The other job of the warm up screen is to blast the phosphors with a full 100 IRE bombardment of electrons. It takes the phosphors about ten or more minutes of this before your black level, white level, gray scale, and gamma will be correct. If you look at a black level test pluge right after turning on the projector, you will notice that it will be much too dark compared to a fully warmed up machine. So if you start watching without any warm up, the image will be too dark and the gamma is much too high resulting in loss of detail and a punch-less image.

Full 100 IRE white quickly gets the phosphors ready for reference performance. Just watching a movie for twenty minutes does not do the same thing. Joe Kane used to point out that if you watch a two hour movie without a warm up screen, the phosphor is at its peak performance at the very end of the movie. In other words, there is not enough of a work out with regular viewing, so it takes nearly two hours before the phosphor is ready for reference use. If you use no warm up, you only see what your projector can really do after two full hours of viewing

What I do for myself is to turn on my G90 and let it run with no input and no warm up screen for 15~25 minutes. At that point the convergence is perfect. I then turn on my Lumagen with a full 100 IRE white field and let it run for 5~10 minutes. With this combo I get full performance without the risk of running the warm up screen off the face of the tubes.

craigr
__________________
Precision Video Calibration
www.CIR-Engineering.com

[garyfritz]

Hm. I've never heard of it, but Craig should know what he's talking about. (Joe Kane too. )

Interesting. I may have to try that on my projector and see if I notice a difference. If it changes that much, you'd want to hit it with 100IRE before you did a calibration, too...

[Jeremy112]

When I am the only one viewing, I usually just fire the 1100 up and go, the minor amount it is off until it warms up doesnt bother me.

When I know I will be having company I warm it up about an hour in advance. mainly to play with it until the guests arrive

Whats more fun than spending time with your projectors remote

[Jeremy112]

[CasetheCorvetteman]

The NEC i turn on and watch, there is no difference between warm and cold with that.

The Sony i warm up with a hair dryer when the weather is wet, if i dont it wont turn the HV on.

[AnalogRocks]

I have to add fans to cool mine down it's hot up here

[AnalogRocks]

I have to add fans to cool mine down it's hot up here