Official JVC RS55/X70 owners thread. - Page 96

I see, well at the present time no one knows the answer. JVC owners in general are now just receiving the newer lamps. It will be a couple of months before reports surface on how the newer lamps perform. There are several JVC threads where people complain of early lamp dimming with the newest model projectors. Craig John in this thread just had one go out. It's not the projector design but the lamp design. So IMO, until they come up with a better lamp design or go with a reliable lamp manufacture. The model you get really doesn't matter.

How do we know it's not the projector design, I am not an expert in lamps but I am pretty sure it could be either or. There could be a flaw in either AFIK.
For now I'll assume it is the lamp, but you also have to wonder if name brand lamps are really MFR'd all that differently.

Considering how much a JVC bulb costs, there is no excuse for selling sub-quality lamps and buying them from some cheap MFR. I have no problem on my Viewsonic lamp, it has 1300 hours and is very bright still, the thing only costs $225 for offical lamp kit + housing if I were to replace it. The projector is only $800 new. Their margins are tiny compared to JVC's margins, where is JVC's money going (I guess R&D for better black levels).

Got my 55 mounted along with my Carada 136" BW Scope Screen. Watched Fifth Element and Ghost Protocol last night. Let's just say I'm extremely impressed. Color, contrast, sharpness, are all very good right out of the box. Even in Nomral lamp mode it was plenty bright on that screen in Scope format and no anamorphic lens. We were only sitting 11ft away and it looked extremely smooth too. Again, extremely impressed.

Awesome. I really like the Carada screens and I don't think I'll be spending much more money on a Stewart 130 since they are pretty much the same performance. I also don't understand how someone can pay even more money for a Screen Innovations Black Diamond. Carada BW all the way. I think the JVC and Carada are a perfect match.

Well, great CS from AVS...

JVC... not so much. The bulbs are out of stock.

ETA for bulbs... "Hopefully, the end of the month."

Editorial Comment: Someone asked about the bulb's reliability the other day... If the replacement bulbs are out of stock, what does that imply about the reliability of these bulbs?

Craig

I am a bit confused. The recent JVC models 45/55/65 include the -003 release of the lamp already. Has someone found a -004 one?

They didn't think they would have a problem, so ordered none

The newer -003 Lamps now have a air vane in the exhaust port. The only conclusion I can draw is they are still having lamp issues......

Ah I see....so this is -003.5 then

This may explain why some have consistently had issues and others haven't. It is to do with ventilation / air flow issues. Ambient temperature may have a lot to do with premature dimming.

I had a bit of a drop on my bulb between 80-110 hours. Since then it has remained pretty much constant. Now at about 200 hours.

Already out of lamps? WOW ..the last order a few weeks ago was for 1000 lamps per JVC Rep! He said only 5 or so were replacements due to bad lamp performance.
They must have not received any where close to that number in the last shipment?

Maybe 5 or so from this one thread in the past month

Oh man, I feel sick to my stomach.

I was trying to get into the advanced picture menu...it's late and I'm tired...and somehow I manage to press "reset picture" instead! This was in my professionally calibrated user mode (calibrated by umr)! So my entire calibration is gone!

However, umr gave me a print out of all the picture settings for the calibrated image. It's quite extensive (and I've never really gone remotely into such detail in the projector menus). But if I can just re-set all the picture settings to the same values as on the calibration report, I should have the same calibrated image.

Shouldn't I?

(Please tell me I will...)

Ironically, I was only moments before CURSING the omission of the "lens app" button on these new JVC remotes, forcing me to search through into the advanced menu every damned time I want to adjust the aperture. Now, this....

Bummer!

I feel your pain. But I think you should be fine, if you have detailed settings, and re-set them, you should be back to where it was.

Yes you will be back to the custom calibration settings once you input them back into the projector. It happens, I did it with my old Pioneer Elite 510. I fortunately had written down all of the settings for each input.

Actually you won't have lost everything. The custom gamma and colour temperature will still be there. By resetting a picture mode, you only reset about 10-15 things. It should take you all of about 10 minutes to restore it.

If you go back and review posts over the past year+ on the various JVC threads you will find that the JVC lamps are almost always reported by JVC customer service to be on backorder and the waiting time is usually overstated. Back around March 1st they were telling customers that the lamps were on backorder until mid-April even though there was actually only about a 1 week delay in shipping out a replacement lamp for most customers. It appears that JVC USA receives periodic shipments once or twice a month from Asia and depending on where your order falls in the cycle and the demand for replacement lamps at that moment, the delay in shipping out the replacement lamp can vary from just a day or two up to a few weeks.

Thanks Ron, I was also told a much longer time before my lamp would ship as well. It surprised me when they shipped it out within a week of me reporting the issue. I suppose it is a standard practice to give themselves some leeway in order not to build false hope on the lamp's arrival.

It's an old customer service trick, when a customer is waiting on sometihng that is not of a critical nature you lower expectations so that it comes out better than expected (not that a lamp isn't critical entertainment wise, but I mean in general)...

Psychologically the person then feels happier about the situation in the end.

Whew! Thanks guys!


That's great to hear.

So, looking at my calibration report: it has settings for the common settings that come up on the picture menu, e.g. there's about 23 settings, from color profile, red/green/blue gains and offsets, dark level, bright level, on up to sharpness etc.

And then all the settings beyond that are under "Custom Gamma Correction Value", so under "white" "red" "green" "blue" there are a bunch of numbers. (Followed by numbers for colors under "color management").

Do I assume correctly that the numbers under the "custom gamma" heading are the ones that will remain the same, and that I'll be adjusting only the initial 23 or so settings?

Thanks,

You shouldn't have to touch red/green/blue gains and offsets either because they are a selected custom profile like the gamma one. It is just a question of choosing the right profiles from the main user preset options. I had a look through some notes you sent me before. I think you can do this in about 20 seconds.

Color profile = Stage
Color temp = Custom 1
Gamma = Custom 1
Lens aperture = ?? - This was left to you to set to 14 ftL I believe

I believe that is ALL you need to set to get back as you were.

I'm very grateful for your note here. I just went through the settings and it appeared you are correct once I selected the above settings, as well as choosing "color management 1," it seemed all the settings were as indicated in my report. (Though I didn't go through all the custom gamma settings)

Thanks so much again!

TWO LAST QUESTIONS:

1. I'd like to copy my calibrated settings, under "User 1" into the "User 2" setting (so essentially I have a back up if I screw up again, and also perhaps to tweak that setting). People have talked about doing a copy of one picture setting into another user picture setting, so I'd assumed there was some simple "copy picture setting" from one picture setting to "paste" into another User setting feature. But I can't see any such option in the menu, or looking in the manual. Does this mean "copying" the image settings from User 1 to User 2 actually means manually inputting all the settings again into the new User setting?

2. Now that my system is ready to get dialed in: I do have some conformity issues I'd like to correct. Is it ok to start using the fine color grid adjustments now provided by these new JVC projectors? Or are there some issues with doing so (e.g. I seem to remember that such digital "fixes" for convergence can end up causing more harm than good).

You are very welcome Rich.

There is no copy and paste. I think the RS65/X90 has that feature. Another one of those little things that JVC have done to try and distinguish the models more. However, if you repeat all the settings you just did again in user 2, the gamma will be there, but not the gains/offsets. Gamma1/2/3 is persistent across all user presets. But for gain/offsets, each user preset has its own custom 1/2/3 version. So you would need to copy the gains and offsets over. Once again though, it shouldn't be more than about 10 minutes of effort.

As for convergence, my own experimentation showed that a change of half a pixel halves the resolution for that colour in the affected part of the screen. It is hard to determine what fractions of a pixel actually do to resolution. My advice to you, is if you see visible fringing from seated towards the edges of the screen, use the zone adjust to dial them out. I do not recommend using zone convergence at the centre. Get the centre within half a pixel using whole pixel movements only if you can, and then just dial in the edges. If you cannot see any visible fringing from seated, then just don't worry about it.

Through a lot of my own experimentation, I realise there is very very little truthful information on the net about the effects of misconvergence on resolution. It is absolutely not true, that one pixel of misconvergence = half resolution. Actually it seems to affect contrast more than resolution. For example, consider an alternating black/white zebra pattern, going white/black/white/black each alternating pixel. Now imagine a 1 pixel misconvergence in green, so effectively it is actually purple, green, purple, green. The resolution hasn't changed at all! The colour information is now wrong, although the brain does an amazing job of filtering those errors out so you probably won't see it. But more importantly, the contrast is affected because it should have been x lux on white, and 0 lux on black...but this is now compromised. Misconvergence is actually poorly misunderstood and I don't pretend to understand its effects fully either. I can tell you though that the variance in optics between projectors plays a MUCH larger part in perceived sharpness than misconvergence. Also misconvergence in blue is largely irrelevant. Always prioritise green/red.

Having said that, I would still desire a well converged projector. My X70/RS55 is not great to be honest. It is within about a pixel over the whole screen, but never any better than 0.5 a pixel anywhere. The most annoying thing is when you first switch it on, its near perfect...then it just starts deviating in a very peculiar/non-linear manner. I think it behaves better when its right-way-up as opposed to its current up-side down location.

Got it. So as long as I select "Gamma 1" in the new User 2 setting, it will carry over all the custom gamma settings of the calibration.



Will do.

What's the latest firmware for the rs55/x70.

To me the effects of misconvergence are pretty clear, it is more about perceivable effects than it is about measurement effects. I (mostly?) agree with you about the effect on resolution, it can even vary depending on what colors are converged and how far off.

The reason it doesn't cause any major loss in resolution is not because technically the convergence error can never cause any resoution loss at any part of the screen where colors converge, depending on how you define resolution. The convergence error is only primarily visible where certain different colors CONVERGE which are suceptible to showing the error because of the colors displayed on adjacent pixels, that's why there is no resolution loss across the majority of the screen. You could argue some of the resolution is maintained even at the edges of where the colors converge because if the outer pixel were encoded as red, you would get a purple pixel that wasn't actually BLUE anymore, then we haven't lost resolution in the sense the pixels can still be seen individually. That is true too I suppose, but it's not the intended color and could cause a perceivable loss in resolution theoretically, but more importantly in some cases a bad convergence error can cause 2 pixels to appear as 1 larger pixel (which I have no problem people calling that a loss in resolution, even if in the most purist sense the pixels can still be addressed separately and are still separate in a grid sense), but again only certain colored pixels mixing adjacently can cause this, so it won't be across the majority of an average scene.

First, we have to define resolution, to me resolution is simply the ability to control different pixels to get them to the intended color or state. For instance as a purist example, if I take a square cut in half (2 pixels) and the convergence error made both those squares 1 giant blue pixel with some colors (black mixing with blue for instance), then yes that could be called a loss in resolution in that one scenario, but the loss in resolution would only appear for very specific objects on edges of certain color shapes, and for most people they could not see it from normal seating distances unless it were 1.5 to 2+ pixels off total convergence.

I do agree it does not actually cause a COMPLETE perceivable loss in resolution even on 2 adjacent pixels unless the convergence error is fairly severe, but this is partly just because it is almost impossible to even see 1 pixel from seating distance. Generally speaking, the biggest issue with convergence is just a loss in perceivable sharpness, the other side effects are usually not very visible unless the convergence is very extreme.

The JVC's are EXTREMELY sharp in most cases unless you just get unlucky with convergence.

It's interesting that the JVCs often get knocked as "not the projector you want for sports, but good for watching movies." The friends that packed my home theater tonight watching the UFC in HD on the big screen would certainly disagree, as they were all knocked out by the image. It really was amazing, super bright (brighter than I've ever gotten from my RS20), amazing contrast, with the MPC turned up just tack-sharp, good motion with the CDM on (no artifacts that I noticed at all). Best sports image I've ever seen on a projector (or any display) before.

I used to say that until last Thursday. It was my first time I watched sports after calibrating my RS55. It looked amazing. I turned to different channels and each movie looked almost blu ray like. It was niced and bright and I used CDM 3.

I'm hoping some of u owners can help. I want to use a 55 in my room which I'm building now but not sure if I will be able to fill the screen for both 2.37 and 16:9.

I am hoping to mount 18' back.
Screen size is 110" wide Seymour 4k 2.37 scope so 46.5" tall. I'm sorry I can't remember the 16:9 width right now off my head. 91" maybe.
I am hope to have the lens about 6 inches above the top of the screen to give me more height for clearance of the projector up on the riser.

Should I be ok or will I need to be totally even with the top of the screen? Also am I pushing te distance back for that size screen for both images at this point. Reason so far back is so its behind the seats cause it is going to end up 5' off the riser if even with top of screen.

Thanks so much.
Jim

You will be fine. My throw is 17ft for a 140" wide screen. There is alot of vertical adjustment available for this projector so you don't need to be even with the top of the screen. Your setup will be fine. There are projector calculators available (including a great one by coderguy) that will show you how a projector will work with your given conditions; throw, screen gain, screen size, etc.

Thanks for that. My main concern was tr vertical shift for whe the lens changes from scope to 16:9 and getting both to fit in the screen.

I have played around with projector centrals and the one excel sheet I have and knew I would be fine for the throw ratios and even the output for light but shift isn't part of them. Do u have a link for the one u r talking about.

Also any opinion if it matters to have a 2.35 vs 2.37 and so on for zooming with the jvc?

Thanks again.