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bigsilverdisc
Joined: 19 May 2007
Posts: 60
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| Posted: Tue Oct 28, 2008 10:31 am Post subject: Crt Projector left running |
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Hi
How bad is it for a CRT to be left running with no signal?
I ask this because my G70 has been on for 3 days.
It seems everytime i get a Hiccup in the power supply (Off/On) the projector turns itself on.
Thanks
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jkruger
Joined: 24 Oct 2007
Posts: 2435
Location: Carlsbad, CA
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| Posted: Tue Oct 28, 2008 1:19 pm Post subject: |
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Isn't there some kind of menu setting that can change that?
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Oct 28, 2008 2:42 pm Post subject: |
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Yeah, that sounds like the Service Setting -> Direct Power On menu option. It was designed so that you could wire the projector to a switched outlet and turn the projector on and off with power instead of serial or IR.
When power blips off and on, the projector sees it as the power getting turned on and fires up.
Turn that option off!
SC
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Oct 28, 2008 3:30 pm Post subject: |
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To answer the question. Not bad at all. It is not a bulb PJ where you would have just racked up 72 hours on the bulb for no reason. I can't remember the Sony PJs, but if no text or anything is up, you didn't even really wear your tubes. Keep in mind that these beasts were designed to run 24/7 for years on end. A few days is nothing!
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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front_range
Joined: 03 Mar 2008
Posts: 64
Location: North of Colorado Springs
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| Posted: Tue Oct 28, 2008 3:35 pm Post subject: |
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CRTs left on with no signal get cathode poisoning and that leads to low emissions (a dim picture). It takes some time to do real damage, but setting the PJ to come up in standby mode is the only way to go.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Oct 28, 2008 3:51 pm Post subject: |
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| front_range wrote: | | CRTs left on with no signal get cathode poisoning and that leads to low emissions (a dim picture). |
That takes thousands of hours. 72 hours is not going to do anything.
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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front_range
Joined: 03 Mar 2008
Posts: 64
Location: North of Colorado Springs
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| Posted: Tue Oct 28, 2008 4:26 pm Post subject: |
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The point is you are racking up wear on the cathode whether it has video on it or not. The life of a CRT in continuous use is a few months to a little over a year depending on your standards. If it is on, and not displaying a picture you are just wasting the CRT's limited lifespan.
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Oct 28, 2008 5:51 pm Post subject: |
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| front_range wrote: | | The point is you are racking up wear on the cathode whether it has video on it or not. |
This is all true. However, you seem to be missing OPs question which is essentially "how bad was it that I left my PJ run for about 72 hours without a signal". The answer, simply put is, "not bad at all". Your post does not help answer OP question because you do not define "some time". My follow up post was attempt to define "some time". A critical element required to address OPs question.
| front_range wrote: | | The life of a CRT in continuous use is a few months to a little over a year depending on your standards. If it is on, and not displaying a picture you are just wasting the CRT's limited lifespan. |
The cathode does not wear any faster with no signal then with a signal. Again, you do not define "a few months" however, but the use of the term "few" we know it must be at least 3. There are about 2100 hours in 3 month. There is no way I'm going to agree with you that any tube (even a green one) is only good for 2100 hours. Even if you are a conservative sort and feel the cathode can only last about 6000 hours, that is over 8 months of continuous use. However, I would argue the cathode can handle much more than that (at least double).
So, back to OP. Yes, he just eliminated somewhere between .6% and 1.2% of his cathode's life. So, unless you're Chicken Little, I still have to answer back to OP: You didn't damage it, don't worry.
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Dave
A train station is where the train stops. A bus station is where the bus stops. On my desk, I have a work station....
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rabies_70
Joined: 15 Feb 2007
Posts: 1189
Location: Carlsbad, CA
TV/Projector: Sony G70Q
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| Posted: Tue Oct 28, 2008 6:31 pm Post subject: |
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You're srcewed. PJ is shot. But I'll help you out of a bind. I'll give you100.00 plus I'll pay for shipping. So don't feel too bad, it's not a total loss 
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Ray
I am an iconoclast
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Oct 28, 2008 6:56 pm Post subject: |
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You're funny, Ray. I never tire of the "I'll take it off your hands posts."
I'll just add to what Dave said and point out that if it were running 72 hours, that's about like 36 movies as far as cathode wear... but practically zero phosphor wear. Now, if you normally watch two movies each week, then that's like 18 weeks - or about 4.5 months worth of use. It sounds bad, until you think about how long it will probably last you.
A lot of us here only have time to watch 3 movies a week. I can't ever sustain that, except for when I take a vacation or something where we watch 6 in a week. Of course, that's offset by the times in the summer when I go two weeks without even making it into the theater.
Anyway, that means in a good year, we'll only roll on a couple hundred hours! So, even if you use 300 hours/year as a baseline, and you said you only wanted to run your tubes to 3000 hours - that's TEN years. I'm pretty sure I won't still be running my G70 in 4 years, let alone 10. Obviously, it depends on the condition of the machine in question and how much you use it, but you get my point.
I'll agree with Dave and say if the machine is in nice shape, then 3 days doesn't mean squat. If it isn't in nice shape, then you wouldn't care, anyway!
SC
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front_range
Joined: 03 Mar 2008
Posts: 64
Location: North of Colorado Springs
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| Posted: Tue Oct 28, 2008 7:37 pm Post subject: |
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Look at what I posted, I never implied 3 days would ruin the PJ. I stated it wears the cathode out unnecessarily, and you should configure the set to power on in standby rather that have the PJ running on no video everytime you have a power glitch.
Over the last 30 years I've temporarily rejuvenated a couple dozen CRTs that had cathode poisoning, so don't try to tell me it doesn't happen.
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Tue Oct 28, 2008 10:59 pm Post subject: |
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From what I've seen, a set without any filament voltage issues (MArquees) that are turned on and left in idle mode without video showing should last 12,000-15,000 hours before emission starts to drop. That's just under 2 years.
Look at the older CRT bank teller monitors. We didn't see those flake out until maybe 4-5 years after they were first put in, so I think my above number is low.
Seems that the Sony 8" tubes used in the BG808s can die prematurely at under 10K hours, but Matsushita (Panasonic) tubes go almost forever.
Just my $.02.
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Wed Oct 29, 2008 12:42 am Post subject: |
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> ...on and left in idle mode without video showing should last 12,000-15,000 hours before emission starts to drop. <
Great info to have. Thanks, Curt!
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