Okay, so I can see that the majority are clearly of a mind that xrays cannot pass through the heavily leaded front of the picture tube. What about the thin, transparent neck in the back of the tube? Nothing much offering protection there, is there?
Many computer rooms, work cubicals, etc., have the monitors lined up back-to-back so that people on the opposite side would receive the X-rays from the back of the other monitors. If X-rays were a significant issue, we would have heard about it by now.
--- sam | Sci.Electronics.Repair FAQ Mirror:
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How long did it take to get the news about smoking ? About asbestos ? And about zillions of other hazards ?
Bye the way: why are these cubicals being bulk-replaced by LCD ? :-)
-- Kind regards, Gerard Bok
Hi...
Not sure it's the *only* reason, but the compelling one is energy consumption.
Ken
Indeed I find it compelling for the energy supplier that those monitors are indeed consuming _more_ energy, at least in standby...
-- Met vriendelijke groet, Maarten Bakker.
It's the fashion of the day.
N
Your company isn't with it unless they have replaced all their CRTs with LCD monitors. What would the clients/customers think? Never mind that a good CRT monitor still has advantages for many applications with its better color rendition and so forth.
I wonder if those that make such decisions really think about the power saving issues, whether they are bogus or not. It's probably some clueless CEO type making those decisions. :)
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I just had to choose between $270 for a baseline LCD model with dubious lifespan and repairability or $130 for a superb glass monitor with excellent features. Easy choice. I _will_ be buying an LCD soon, but only if it saves room on a narrow reception counter.
N
The glass there has lead in it too, but the anode is not there, it's at the front of the tube. It's just not possible to get xrays out the back, you can't deflect the beam back to there and there's nothing for it to strike if you could.
CRT monitors everywhere are being bulk replaced by LCD, mostly it's size, you can fit more people jammed in a room if the monitors are thinner, then there's power consumption, and heat, resulting in less air conditioning load.
Huh? Typical CRT monitor is 150W, typical LCD is 35W, even if the LCD uses a tiny bit more in standby, it still comes out far ahead in most cases.
You are right of course, I was not thinking when I wrote this. What I meant to say was, don't think it will consume no power when switched off. In some cases it can draw in excess of 10 watts then, compared with a typical 0.5W power draw for a CRT monitor. It will make up for this when used more than a few minutes a day, but still.
-- Met vriendelijke groet, Maarten Bakker.
what are you smoking dutchman seems to be stronger than pot
1/2 a watt CRT on stanby? get real the freakin pilot light on the front uses that much
I think he meant when you turn it completely off, in which case it shouldn't use any power at all, while an LCD will normally have an external PSU which is powered up all the time.
Thanks for translating this, i did start thinking that my English was outdated when reading that.... ;-)
JAnne G
In a properly designed LED 'pilot light', you'd have far less than a half watt.
5vdc x 20ma. = 0.1 wattThere are low power LEDs which run on much less than that.
with
You're right about the LED of course, the problem is that far more than the LED remains powered up when the monitor is in standby. Personally I just shut it off whenever I get up from the computer for more than a couple minutes, always have. I never really understood the significance of the standby feature but I guess a lot of people are lazy.
Thankfully the new Energy Star standards went into effect this year, so now the limit for that certification is 4 watts in standby. Next year it will be 2 watts in standby. However, at least the pair of Dell flat panels I'm using are specificed at 2 watts standby already. Since that costs me a few cents a month I just don't think about it. More benefit was obtained by going to a 90%-class power supply for my system. Season and a couple others make those.
-Keith
Just some comments for the history of the problem
The original X-Ray problem was found in some GE color tube sets that used a triode as a high voltage shunt regulator.
As long as the shunt was working properly there was no significant X-Ray production and the triode was designed to contain the very low KV (soft) X-Rays it did produce.
It was found that there was a failure mode that allowed the HV to rise and the increased voltage was enough to generate a stronger (harder) X-Ray that could exit the shunt tube.
As I recall the most intense area was directed down through the bottom of the case. One of the comments about it's danger was that the most likely person to receive significant exposure was the bar tender standing under a wall mounted set.
I was part of a radiation safety team that inspected a GE plant in Illinois that produced this chassie in the middle 1960s. As I recall there was no recommendations for any changes to the production line at the plant to reduce the exposure levels as there was not a level of radiation present that required it.
A set was badly misadjusted for us to make some measurements that confirmed the exposure levels.
Hugh retired Nuke Safety Geek
----- Original Message ----- From: "Sam Goldwasser" Newsgroups: sci.electronics.repair Sent: Friday, June 17, 2005 7:02 AM Subject: Re: X-ray danger whilst working on TV?
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Of course I can't find the model was referring to now, but the Prodcut sheets for most current Philips CRT monitors state less than 1 watt for power off modus. Of course they could have used a real power switch to bring this down to as low as 0 watts, as done in some Grundig TV sets where you can actually make the power switch physically turn off by remote control.
-- Met vriendelijke groet, Maarten Bakker.
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