or Connect
AVS › AVS Forum › Display Devices › Digital Hi-End Projectors - $3,000+ USD MSRP › Please post experience of JVC HD750/350/550/950 bulb lifetime / lamp brightness drop
New Posts  All Forums:Forum Nav:

Please post experience of JVC HD750/350/550/950 bulb lifetime / lamp brightness drop - Page 20

post #571 of 738
Thread Starter 
Quote:
Originally Posted by dangc View Post

You need to go post in the RS40/X3 thread to help balance expectations. All you hear over in that thread is that the projector is the best thing since sliced bread, 3D is spectacular and plenty bright....and still plenty bright after 200 hours.

Loss of 30% light loss after 150-200 hours is terrible...I sure hope that tails off quickly, you will be to half life in another 150 hours at that rate.

You say this projector is louder in high, by a lot? I never heard the prior generation in high so I don't know what to compare that to really. I have an InFocus IN83 that is rated at 30DB in low and 33DB in high and while it is fairly loud it is tolerable in low lamp, but it in high it is simply too much. I was hoping the JVC would be quieter in high than my current projector is in low.

If you want a better Projector than you have to go with the SONY VW90. It is very silent even in high lamp mode, better 2D picture, sharper and you have a real CMS

but:

It cost 2500 Euro more than the X3 and I know that I will sell next year the X3 for maybe 2000-2500 to get a new one....

...maybe a better, second generation 3D projector!
post #572 of 738
Thread Starter 
Quote:
Originally Posted by karrih View Post

Do you know if your HD750 had correct gamma values?

Yes, I had a i1LT and HCFR to calibrate the HD750. The X3 is really the better projector, but it is to loud in high mode and if the lamp drops more, than I have to use the high mode!!

High lamp mode on HD750 is really quite compared to the X3
post #573 of 738
Thread Starter 
Quote:
Originally Posted by Shepardos View Post


Update:

0h 360/220 Lux at D65
120h 280/170 Lux at D65
200h 250/150 Lux at D65

Seems that the bulb constantly loose power

0h 360/220 Lux at D65
120h 280/170 Lux at D65
200h 250/150 Lux at D65
220h. 220/130 Lux at D65

On my X3! No dust on the prism or lamp!!
LL
post #574 of 738
looks subtly hazy. maybe try cleaning with a cotton bud anyway? nothing to lose
post #575 of 738
Yes, there is something to lose if he is ham-handed. I see no evidence of gassing, so I'd leave it alone.

Jeff
post #576 of 738
Quote:
Originally Posted by kimmik View Post

looks subtly hazy. maybe try cleaning with a cotton bud anyway? nothing to lose

Yes, in a photograph it's hard to tell for sure, but if it looked that way to me in real life, I know I'd need to clean it.

Quote:
Originally Posted by pepar View Post

Yes, there is something to lose if he is ham-handed.

Very true. Not for the squeamish because doing it wrong could result in a very expensive repair that might not be covered by warranty.

Quote:


I see no evidence of gassing, so I'd leave it alone.

There we go, three people that have seen the photo, and done the cleaning on their own projectors -- and three different opinions.

As always, to the OP, YMMV.
post #577 of 738
Hi All,
I've just recently become a member of this forum. I am a member of 'avforums.com'. But decided to become a member here so that I could post this message.

This forum is where I first found out about cleaning the prism in front of the lamp on my JVC HD350 PJ. I had amazing results after cleaning the lamp side of the prism as recommended on this particular forum.

But, at 1500 hrs on my PJ I have gone one step further...

Stripping down the projector to clean the 'other side' of the prism. Read why in my post on the 'avforums.com' forum. I thought I would let you guys know, as I have learned good advice from you guys in the past.

I've got to post three times before giving you the link, so here's post one!

Thanks
Darren
post #578 of 738
And post two!
post #579 of 738
Post three!
post #580 of 738
And now the link...

http://www.avforums.com/forums/proje...-part-1-a.html

Phew!

Thanks
Darren
post #581 of 738
Thanks, Darren. The suspense was killing me.

Reading your AVForum post now ...

Torch ... is that Brit for flashlight? I do have some tiki torches around from the last luau we threw, but they burn sooty and would probably add more haze ...

I hear ya though! The next time I pull my projector down and open it up, I will use your technique to inspect the other side.

Jeff
post #582 of 738
Hi Jeff.

Yes, 'torch' is the same as flashlight to us.

But yes, 'torch' over here can be regarded as a battery operated flashlight or something you set fire too!!!

So, yes a flashlight is definitely the correct thing to use... using a 'sooty' torch will probably make it even dirtier than when you started! Ha! Ha!

The 'dark side' of my projectors prism was pretty murky by 1500 hrs. As shown in the pics on 'avforums.com'. How many hours do you have on your PJ and what sort of conditions does it operate in?

Thanks
Darren
post #583 of 738
Sat down for my first major viewing since the 'big clean'. Watched Avatar on Blu-Ray. Gotta say, very happy with the results. A definite all-round improvement in image quality and brightness since the strip down and clean.

I love a great result!

Thanks
Darren
post #584 of 738
Quote:
Originally Posted by CptWiggette View Post

Hey Guys!

I have an RS20, just pulled the bulb and cleaned the inside prism with some alcohol-based lens cleaner, and also cleaned the glass in front of the bulb.

The glass was, however, cracked really good across the face.

Should I be concerned about this if the bulb blows? Should I replace the bulb immediately? My projector is still barely under warranty, is this something JVC would cover at all, or would this fall under the 90-day bulb warranty?

Thank you.

Probably a bulb warranty. Several other folks including me have had that happen. After some consternation I decided to be safer than sorry and bought a new bulb. But I kept the old one just in case I have a situation (room full of people and the bulb dies) where I am willing to risk it for one showing.
post #585 of 738
I first noticed that my bulb glass was cracked at about 700 hrs. I've now got just over 1600 hrs on the same bulb with no problems.

Darren
post #586 of 738
Quote:
Originally Posted by dangc View Post

Yep! I tried to point out the expected light loss in the new RS40/50/60 thread but of course people would have none of that, they will live and learn especially the new projector owners....This is why I plan an annual bulb replacement which comes out to every 600 to 700 hours. This will also be my 4th projector in 5 and a half years so I know better.

I watch about one movie a week in my current projector. so about130 hours a year. keep it for 3 years. so I should be good without having to replace a single bulb. Hopefully lasers or leds will be the thing for next time.
post #587 of 738
Quote:
Originally Posted by avzektor View Post

I first noticed that my bulb glass was cracked at about 700 hrs. I've now got just over 1600 hrs on the same bulb with no problems.

Darren

There may be safety reasons to replace the lamp assembly .. cracking further and damaging the bulb itself .. shorting the lamp circuit. But I think that there is so much intense light inside that cavity that the crack does not block or otherwise interfere.

Jeff
post #588 of 738
Is it really the lamp envelope itself that's cracked?

I'm surprised they don't explode soon given that the internal pressure is ~3000 psi.
post #589 of 738
OP said it was the "glass in front of the bulb." Not definitive, I know, but my guess is that it is not the bulb itself.

Jeff
post #590 of 738
Quote:
Originally Posted by pepar View Post

OP said it was the "glass in front of the bulb." Not definitive, I know, but my guess is that it is not the bulb itself.

Jeff

Correct.
post #591 of 738
Ah, I don't see a safety issue then.
post #592 of 738
Quote:
Originally Posted by noah katz View Post

Is it really the lamp envelope itself that's cracked?

I'm surprised they don't explode soon given that the internal pressure is ~3000 psi.

Sorry, yes, the bulb reflector body is fine. It's the separate thick piece of glass in front of the bulb itself that is cracked.

Darren
post #593 of 738
So I skimmed the majority of the thread and am I right to assume that JVC has still made no comment on this issue? And that there has still not been a consensus of what is actually accumulating on the prism?

If it is fine dust particles then it would explain why some people don't see it or see a much lesser degree of it. To the people that see a great degree of it, how often do you clean your filter? I don't think JVC recommends cleaning at specific intervals but I know some projector manufacturers recommend cleaning every 100-200 hours. It would be interesting to see if anyone who cleans their filter every 100 hrs gets build up to this degree. Once the filter is at its "capacity" the dust is going to start flowing inside the projector from the increased pressure of air trying to get in, will it not?
post #594 of 738
Where are you getting that people think this is dust? The consensus seems to be it is from outgassing....a film from a plastic part or other material, maybe caused by the heat. Or maybe you're just asking.
post #595 of 738
I don't think it's dust.

From my experience, it is either gassing from the lamp housing plastics, or the environment my projector is used in.

Either way, as I have found out, stripping the projector down to clean the four internal prisms is a not to onerous task... and something that will only need to be done once in a blue moon. My first strip down was at 1500 hrs. Although, next time I will do it again after another 1000 hrs has passed. The lamp side of the prism is very easy to get to and can be done every 250 hrs or so without a full PJ strip down.

At some point I will be replacing the current lamp (currently on 1600 hrs), it will be interesting to see how dirty the prisms get once a new lamp goes in.

If anyone is interested in the internal strip down and cleaning, see my earlier post with a link to the cleaning process in pictures.

Thanks
Darren
post #596 of 738
Here's the link again

http://www.avforums.com/forums/proje...-part-1-a.html

Thanks, Darren

Re dust, there are two air inlets, one for the panels and one for the lamp; not sure which one is filtered (I'd guess the panels).
post #597 of 738
Darren - did you have any discoloration - e.g. uniformity issues, mainly very light horizontal brownish areas which show during white scenes/patterns - or was it strictly limited to decreased light output? My RS1x developed the dreaded brown/orange uniformity problems several hundred hours in. I noticed this problem while it was still under warranty and sent it in, they replaced the optical block, but no difference. Now based on your post (even though mine is different model, should hopefully be similar enough?) I'm considering taking it apart to investigate whether or not I may have some air impurity induced film on my prisms which might be causing this. Even though we live in a smoke-free home, my wife regularly sets of the smoke detectors when she forgets to clean the oven, DOH! (Now I insist she keep the doors to the media room closed at all times when cooking.)

I took the lamp over to a friends and in his RS1 it didn't show any discoloration so that's not it. And they did change the optical block since I had noted stuck pixels and panel alignment on the original (the new one is actually slightly *worse* for red than my old one, but has no stuck pixels) so I know it was changed. There was also a theory that it had to do with LUT calibration being done in non-inverted mode and causing problems inverted (how mine is mounted) but I took it down to test upright and that didn't resolve the issue either. I'm now convinced that some transparent element of the light path near the bulb is the problem. Its really all that's left at this point.

Sorry, don't want to get too far OT but wanted to ask you. BTW, have there been similar reports of uniformity issues with these newer units?
post #598 of 738
Quote:
Originally Posted by Doug G View Post

Darren - did you have any discoloration - e.g. uniformity issues, mainly very light horizontal brownish areas which show during white scenes/patterns - or was it strictly limited to decreased light output? My RS1x developed the dreaded brown/orange uniformity problems several hundred hours in. I noticed this problem while it was still under warranty and sent it in, they replaced the optical block, but no difference. Now based on your post (even though mine is different model, should hopefully be similar enough?) I'm considering taking it apart to investigate whether or not I may have some air impurity induced film on my prisms which might be causing this. Even though we live in a smoke-free home, my wife regularly sets of the smoke detectors when she forgets to clean the oven, DOH! (Now I insist she keep the doors to the media room closed at all times when cooking.)

I took the lamp over to a friends and in his RS1 it didn't show any discoloration so that's not it. And they did change the optical block since I had noted stuck pixels and panel alignment on the original (the new one is actually slightly *worse* for red than my old one, but has no stuck pixels) so I know it was changed. There was also a theory that it had to do with LUT calibration being done in non-inverted mode and causing problems inverted (how mine is mounted) but I took it down to test upright and that didn't resolve the issue either. I'm now convinced that some transparent element of the light path near the bulb is the problem. Its really all that's left at this point.

Sorry, don't want to get too far OT but wanted to ask you. BTW, have there been similar reports of uniformity issues with these newer units?

Hi Doug,
I can't say I noticed any discoloration, but I can say that on the smallest aperture setting, the left side of the image seemed to be duller than the right. This seems to tie up with the dirt on the prisms. They were more dirty on one side than the other side. I'd imagine though, if they've replaced the optical block... the prisms would be replaced as well, as they are all in one unit.

Darren
post #599 of 738
Just to reiterate/refresh what gets hazy and needs cleaned in projectors with the problem, go to this post.
post #600 of 738
Just tried cleaning my RS10 at 1750 hours.... no improvement... the prism looked clear and using a dry microfiber cloth didn't look any different.... lucky I guess : )

I have a 114" screen .95 gain (about) and I just bumped the bulb to high power with the aperture wide open. It's plenty bright at this setting for now.

I guess I have a good bulb as well. : )
New Posts  All Forums:Forum Nav:
  Return Home
AVS › AVS Forum › Display Devices › Digital Hi-End Projectors - $3,000+ USD MSRP › Please post experience of JVC HD750/350/550/950 bulb lifetime / lamp brightness drop