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post #1 of 27 Old 03-01-2019, 11:34 AM - Thread Starter
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JVC DLA - dim picture

Hi all!

I have a JVC DLA RS-67 with about 1800 hours on the original lamp, always on low other than the handful of 3D movies I have watched. Lately I feel like the image is noticeably dimmer than I think it should be. I tried setting the lamp to High but that didn't help much.

In your experience, is this just a case of the bulb wearing out? JVC claims 4500 hours and 1800 seems awfully short of that. How often do you replace JVC bulbs?

How often (if ever) do you clean the lens?
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post #2 of 27 Old 03-01-2019, 12:10 PM
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Originally Posted by schwaggs View Post
Hi all!

I have a JVC DLA RS-67 with about 1800 hours on the original lamp, always on low other than the handful of 3D movies I have watched. Lately I feel like the image is noticeably dimmer than I think it should be. I tried setting the lamp to High but that didn't help much.

In your experience, is this just a case of the bulb wearing out? JVC claims 4500 hours and 1800 seems awfully short of that. How often do you replace JVC bulbs?

How often (if ever) do you clean the lens?
The RS67 lamp was rated for 3,000 in high and 4,000 in low. That is to half life. What size is your screen, aspect ratio and gain? Number of lamp strikes can make a difference also. What I mean, turn on projector and run it one hour, turn off and then turn on for another hour, turn off and then turn on for another hour. That would be three hours of use, but it puts more wear on the lamp than turning the projector on for three hours.
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post #3 of 27 Old 03-01-2019, 01:05 PM
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Originally Posted by Mike Garrett View Post
The RS67 lamp was rated for 3,000 in high and 4,000 in low. That is to half life. What size is your screen, aspect ratio and gain? Number of lamp strikes can make a difference also. What I mean, turn on projector and run it one hour, turn off and then turn on for another hour, turn off and then turn on for another hour. That would be three hours of use, but it puts more wear on the lamp than turning the projector on for three hours.
JVC rep told me they had one customer burn out 3 bulbs in 6 months. JVC sent someone to his house to look at the unit as they thought it may be defective. Turned out the customer was turning the unit off every time anyone left the room to "save the bulb time". The constant on/off killed the bulb in a couple of months.
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post #4 of 27 Old 03-01-2019, 02:45 PM - Thread Starter
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Originally Posted by Mike Garrett View Post
The RS67 lamp was rated for 3,000 in high and 4,000 in low. That is to half life. What size is your screen, aspect ratio and gain? Number of lamp strikes can make a difference also. What I mean, turn on projector and run it one hour, turn off and then turn on for another hour, turn off and then turn on for another hour. That would be three hours of use, but it puts more wear on the lamp than turning the projector on for three hours.
Thanks Mike! Its a light controlled, darkly decorated, dedicated theater. 120" unity gain screen.

The lamp strikes is something I didn't consider. I would say that on average, I watch for 3-4 hours per session. Some longer, some shorter but I would say 3 on average. Its almost exclusivly movie watching.

3 hours average would be 600 lamp strikes making my total hours 1800 + 600 = 2400 hours on low.

So 4000 hours to half life means what? Lamp burns out or brightness is reduced to XX% of original brightness?

Is the light path sealed on the JVC PJ? Is there a possibility of airborne particles dirtying up the internal optics?
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post #5 of 27 Old 03-01-2019, 02:50 PM - Thread Starter
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Originally Posted by Jeff60 View Post
JVC rep told me they had one customer burn out 3 bulbs in 6 months. JVC sent someone to his house to look at the unit as they thought it may be defective. Turned out the customer was turning the unit off every time anyone left the room to "save the bulb time". The constant on/off killed the bulb in a couple of months.

Wow. That sounds painful considering the time it takes the PJ to turn off and on!
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post #6 of 27 Old 03-01-2019, 03:35 PM
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Originally Posted by schwaggs View Post
Is the light path sealed on the JVC PJ? Is there a possibility of airborne particles dirtying up the internal optics?
This webpage shows how much dust can get inside the light path:

https://www.avforums.com/threads/jvc...block.2126897/

I don't think the design has changed much on your model, but other people here probably know better.
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post #7 of 27 Old 03-01-2019, 06:00 PM
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Originally Posted by schwaggs View Post
Thanks Mike! Its a light controlled, darkly decorated, dedicated theater. 120" unity gain screen.

The lamp strikes is something I didn't consider. I would say that on average, I watch for 3-4 hours per session. Some longer, some shorter but I would say 3 on average. Its almost exclusivly movie watching.

3 hours average would be 600 lamp strikes making my total hours 1800 + 600 = 2400 hours on low.

So 4000 hours to half life means what? Lamp burns out or brightness is reduced to XX% of original brightness?

Is the light path sealed on the JVC PJ? Is there a possibility of airborne particles dirtying up the internal optics?
If you are at the short end of the throw, you would get around 900 lumens (high lamp iris fully open) out of the RS67. At half live we would be looking at around 450 lumens. That would give you 10.5FL. I did not ask your throw distance, if it is longer than minimum, then you will have even less brightness. So I could see where at 1,800 lumens, you could be on the dim side.
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post #8 of 27 Old 03-01-2019, 06:09 PM
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Originally Posted by schwaggs View Post
Hi all!

I have a JVC DLA RS-67 with about 1800 hours on the original lamp, always on low other than the handful of 3D movies I have watched. Lately I feel like the image is noticeably dimmer than I think it should be. I tried setting the lamp to High but that didn't help much.

In your experience, is this just a case of the bulb wearing out? JVC claims 4500 hours and 1800 seems awfully short of that. How often do you replace JVC bulbs?

How often (if ever) do you clean the lens?
You'll never get 4500 hours. I remember my x500r (same basic series as your RS6710), bulbs would get put on high at 1000 hours and replaced around 1500 hours. New bulb brightens it back to where it was. You should just get a new bulb and see.

The newer series starting with RS500 seemed to about double the usable life of the bulb. I hit 3200 hours on my last RS500 bulb before even having to go to high.
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post #9 of 27 Old 03-01-2019, 08:37 PM - Thread Starter
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Originally Posted by Mike Garrett View Post
If you are at the short end of the throw, you would get around 900 lumens (high lamp iris fully open) out of the RS67. At half live we would be looking at around 450 lumens. That would give you 10.5FL. I did not ask your throw distance, if it is longer than minimum, then you will have even less brightness. So I could see where at 1,800 lumens, you could be on the dim side.
Thanks agian Mike,

My throw is around 14 feet, if I remember correctly. I've never used the dynamic or static iris.

Regardless of how bright it could be, my question is around the fact that I thought the brightness was good when I first setup the PJ 30 months ago and today it looks noticeably dimmer with crushed blacks at less than 1/2 the advertised bulb life.

I have no problem trying a new bulb, I'm just wondering if less than 1/2 the advertised life is normal. After all, nobody ever gets the EPA estimated mileage out of a new car!
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post #10 of 27 Old 03-01-2019, 08:44 PM - Thread Starter
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Originally Posted by markmon1 View Post
You'll never get 4500 hours. I remember my x500r (same basic series as your RS6710), bulbs would get put on high at 1000 hours and replaced around 1500 hours. New bulb brightens it back to where it was. You should just get a new bulb and see.

The newer series starting with RS500 seemed to about double the usable life of the bulb. I hit 3200 hours on my last RS500 bulb before even having to go to high.
Thanks @markmon1 ! This is the feedback I was looking for. I received an extra bulb with the JVC when I bought it so I can easily give that a try. I didn't want to try the new bulb if I was way out of range of normal life of a bulb.

BTW - You wouldn't happen to have pinball machines at your place, would you?
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post #11 of 27 Old 03-01-2019, 09:12 PM
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Originally Posted by schwaggs View Post
Thanks @markmon1 ! This is the feedback I was looking for. I received an extra bulb with the JVC when I bought it so I can easily give that a try. I didn't want to try the new bulb if I was way out of range of normal life of a bulb.

BTW - You wouldn't happen to have pinball machines at your place, would you?
Yes, a bunch, lol Why?

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post #12 of 27 Old 03-01-2019, 09:41 PM - Thread Starter
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Yes, a bunch, lol Why?

I recognized your name from Pinside. Small world.
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post #13 of 27 Old 09-19-2019, 09:25 PM - Thread Starter
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Update: I didn't get a chance to replace the bulb before it exploded in July at 1950 hours. Popped the new bulb in and it is like a new projector! It was the bulb after all.


Thanks for the advice and help guys.
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post #14 of 27 Old 09-19-2019, 09:31 PM
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Originally Posted by schwaggs View Post
Hi all!

I have a JVC DLA RS-67 with about 1800 hours on the original lamp, always on low other than the handful of 3D movies I have watched. Lately I feel like the image is noticeably dimmer than I think it should be. I tried setting the lamp to High but that didn't help much.

In your experience, is this just a case of the bulb wearing out? JVC claims 4500 hours and 1800 seems awfully short of that. How often do you replace JVC bulbs?

How often (if ever) do you clean the lens?
1800 hours in my book is pretty good ! 4000 hours is a probably an engineer's pipe dream in Heaven.
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post #15 of 27 Old 09-19-2019, 09:47 PM
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Quote:
Originally Posted by schwaggs View Post
Hi all!

I have a JVC DLA RS-67 with about 1800 hours on the original lamp, always on low other than the handful of 3D movies I have watched. Lately I feel like the image is noticeably dimmer than I think it should be. I tried setting the lamp to High but that didn't help much.

In your experience, is this just a case of the bulb wearing out? JVC claims 4500 hours and 1800 seems awfully short of that. How often do you replace JVC bulbs?

How often (if ever) do you clean the lens?
It can be one of three things from most to least likely

- the panel gamma has shifted .. this can be fixed buy doing a gamma only auto-calibration. ou can adjust gamma settings in the menu as well to approximate a fix.
- the bulb actually has actually dimmed to the point of it being noticeable. the larger your screen the sooner you would notice. ie if you needed the extra brightness to begin with. 1800 hours is not all that bad.
- there is dirt build up on a mirror or lens surface inside the projector


Edit: oh sorry, saw you replaced the bulb and all is good
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post #16 of 27 Old 09-20-2019, 05:05 AM
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1800 hours in my book is pretty good ! 4000 hours is a probably an engineer's pipe dream in Heaven.
4000 hours life is not unattainable for a modern projector bulb.
Of course, that would depends on the actual type (model) of the bulb and also the power supply board that monitors/powers it.

I've had a bulb once popping, before it even reaching 3500 hours.
But I also had bulbs (same model of bulb on the same projector unit), that exceeded the 4000 hours mark and were still going (albeit with markedly reduced brightness output).

So, I suppose a few bulbs are coming out the factory that aren't that great(?).
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post #17 of 27 Old 09-20-2019, 07:07 AM
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Originally Posted by evonimos View Post
4000 hours life is not unattainable for a modern projector bulb.
Of course, that would depends on the actual type (model) of the bulb and also the power supply board that monitors/powers it.

I've had a bulb once popping, before it even reaching 3500 hours.
But I also had bulbs (same model of bulb on the same projector unit), that exceeded the 4000 hours mark and were still going (albeit with markedly reduced brightness output).

So, I suppose a few bulbs are coming out the factory that aren't that great(?).
For my purposes, a lamp needs to be changed when it is too dim for my tastes. That was usually around 1000 - 1200 hours - 2 - 2/12 years of use for me.

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post #18 of 27 Old 09-20-2019, 10:02 AM
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For my purposes, a lamp needs to be changed when it is too dim for my tastes. That was usually around 1000 - 1200 hours - 2 - 2/12 years of use for me.
That's great.

But unfortunately it wouldn't be practical in my case.
A change every 1000 hours would translate to bulb changes roughly every 3 months.

And to be honest, I rarely notice any significant drop in brightness before 2000 hours.
I keep the bulb in 'Economy' mode as long as I can and when I start to see a drop in lumens, I usually just switch to 'Bright' mode.

This commonly happens at the last 1000 hours of the bulb.

However, my experience is limited only to single-chip DLP units.
I've never had a JVC like the one being discussed here.

Last edited by evonimos; 09-20-2019 at 10:45 AM.
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post #19 of 27 Old 09-20-2019, 10:46 AM
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That's great.

But unfortunately it wouldn't be practical in my case.
A change every 1000 hours would translate to bulb changes roughly every 3 months.

And to be honest, I rarely notice any significant drop in brightness before 2000 hours.
I keep the bulb in 'Economy' mode as long as I can and when I start to see a drop in lumens, I usually just switch to 'Bright' mode.

This commonly happens at the last 1000 hours of the bulb.

However, my experience is limited to only single-chip DLP units.
I've never had a JVC like the one being discussed here.
Sounds like you watch yours for longer stretches of time = less lamp strikes. That will give you a longer lamp life. I had to change lamps every 1000 hours or so with my 3 chip DLP - the Sim Lumis.
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post #20 of 27 Old 09-20-2019, 11:24 AM
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Sounds like you watch yours for longer stretches of time = less lamp strikes. That will give you a longer lamp life. I had to change lamps every 1000 hours or so with my 3 chip DLP - the Sim Lumis.
That's an interesting point you make, but I'm not sure I actually get away with it.

In fact, I have the PJ connected to an HTPC with the screen adjusted to turn off after 10 mins.
The projector follows with settings at 5mins turn off without signal.

I have done that in order to save up on bulb hours, since in the past I ended up forgetting the unit turned on, while I was busy doing something else, or when I doze off in front of the screen late at night.

The result is several turn on/off cycles during each day.
I'd say at least 3 in most days.
But I believe it is better to be like that, than to forget the unit on for no reason or during the night.

Last edited by evonimos; 09-20-2019 at 11:29 AM.
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post #21 of 27 Old 09-20-2019, 11:28 AM
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Originally Posted by evonimos View Post
That's great.

But unfortunately it wouldn't be practical in my case.
A change every 1000 hours would translate to bulb changes roughly every 3 months.
Holy Cow, 1000 hours every three months means 4000 hours per year, or 11 hours of watching PER DAY EVERY DAY OF THE YEAR!

Even counting weekends and 6 hours of sleep per night, I don't even have 4000 hours of free time per year, and my kids are grown up so I have a lot of free time...

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post #22 of 27 Old 09-20-2019, 11:31 AM
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Holy Cow, 1000 hours every three months means 4000 hours per year, or 11 hours of watching PER DAY EVERY DAY OF THE YEAR!

Even counting weekends and 6 hours of sleep per night, I don't even have 4000 hours of free time per year, and my kids are grown up so I have a lot of free time...


Yeah, I know.
I'm probably towards the "heavy-duty use" side of things.

I actually made a post on here a couple of days ago, documenting the 21747 total hours on my BenQ W1110 projector.
It's quite a feat for that particular machine, with only regular maintainance and bulb changes.
All other previous units (not from Benq) gave up the ghost well before that mark.

I actually wonder sometimes with the way the projector counts the total hours of use.
Are they true hours of use or they are calculated using a formula?

Last edited by evonimos; 09-20-2019 at 11:43 AM.
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post #23 of 27 Old 09-20-2019, 11:46 AM
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Originally Posted by evonimos View Post
In fact, I have the PJ connected to an HTPC with the screen adjusted to turn off after 10 mins.
The projector follows with settings at 5mins turn off without signal.

I have done that in order to save up on bulb hours, since in the past I ended up forgetting the unit turned on, while I was busy doing something else, or when I doze off in front of the screen late at night.

The result is several turn on/off cycles during each day.
I'd say at least 3 in most days.
But I believe it is better to be like that, than to forget the unit on for no reason or during the night.
This is not good for the projector or the bulb(though I did read your last post and you hit 20000 hours so apparently its ok xD. Electronics do their best when they maintain a constant temperature. Power cycling frequently throughout the day puts wear on the power supply, regulators, capacitors, and most importantly, as Craig stated, striking the bulb repeatedly reduces its life.

Think of it this way. You spend the same amount of bulb life if you strike it once per day whether its on for 2 hours or 12 hours. I get 7-8000 hours on my W1070 since the projector is on 12-14 hours a day.
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post #24 of 27 Old 09-20-2019, 12:05 PM
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Electronics do their best when they maintain a constant temperature. Power cycling frequently throughout the day puts wear on the power supply, regulators, capacitors, and most importantly, as Craig stated, striking the bulb repeatedly reduces its life.
Yeah I know.
That makes sense.

But It seems that this particular unit has a somewhat more sophisticated lamp power board and monitoring system, that manages to go through the cycles without much damage(?).

In fact, I changed bulb a few days ago and remember that it had reached above 4000 "true" hours and was still going.
Albeit at reduced brightness.

I suppose, what's actually doing far more damage to the bulb and surrounding electronics is continuous stress due to excessive heat.

From my experience, a unit with proper heat dissipation will last longer than one without.

Last edited by evonimos; 09-20-2019 at 12:10 PM.
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post #25 of 27 Old 09-20-2019, 12:08 PM
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Originally Posted by dkersten View Post
Holy Cow, 1000 hours every three months means 4000 hours per year, or 11 hours of watching PER DAY EVERY DAY OF THE YEAR!

Even counting weekends and 6 hours of sleep per night, I don't even have 4000 hours of free time per year, and my kids are grown up so I have a lot of free time...
They may be used for in a home office, in commercial settings, parents home with children(just like a tv on all day), or by disabled/elderly persons.
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post #26 of 27 Old 09-20-2019, 02:48 PM
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They may be used for in a home office, in commercial settings, parents home with children(just like a tv on all day), or by disabled/elderly persons.
Sure, but this is the high end projectors forum, these aren't commercial projectors we're talking about, and I'm not letting a day care in my theater.. The thought of dirty kids hands touching my $3500 screen makes me shiver... lol!

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post #27 of 27 Old 09-21-2019, 06:05 PM
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My JVC RS-600U has about 1200 hours since I bought it... It is actually too bright for my taste so i have to close down the aperture almost all the way to get the brightness levels right on my 108" Stewart Studiotek 1.1 gain screen.


Previously, I owned a RS-57U and that projector was actually too dim... Even having the aperture opened all the way, the picture seemed dark.

If it's not a BIG screen, it's not a theater...
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