I found this while researching plasma tv's. Can the gas in a plasma be refilled?
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Plasma recharging/filling: Nonsense!
Plasmas contain an inert gas which is somewhat similar to neon gas at a lower pressure than ambient air. There have been stories of a few sales people in electronic stores who claim that plasmas need to be refilled. This is not so- plasmas and LCD's never have to be refilled!
Apparently, because of the zeal in which some vendors want to sell other technologies (e.g., rear projection displays and direct view displays) or by ignorance, these sales people claim that plasmas must be serviced annually. Such service, as claimed, consists of recharging the plasma gas. The cells have their brightness restored, and any burn-in that was there prior to the "recharging" is history. The actual facts are that once plasmas are sealed, they are sealed forever (so the gas does not escape). There is no way to open the plasma, or recharge the gas in any way. Opening the the plasma would destroy it.
While the gas does not degrade over time, the phosphors on the inside face of the plasma screen can degrade over time (just like in a normal CRT based TV). One way to help extend the life of your plasma is to set the contrast and brightness correctly- this helps prevent overdriving the phosphors, and lengthens their effective life. If you take care not to burn-in your screen (look at the "burn-in" section of this FAQ), the reduction of brightness is fairly minimal over time. The industry standard is about 30,000 hours of use before brightness drops to 50% of the out-of-box brightness. A rough calculation given 8 hours of TV viewing each day will give you about 10 years before you drop to 50% of original screen brightness. That's roughly the same as directview TVs average replacement. In 10 years, we suspect that plasmas (or their post-successor) will not be as costly as they are today.
Thanks to Ofer, Rogo, and yubyub
---Mark Rubin
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Seems like there is a lot of DISinformation going on out there. Can't ever be too careful.
Here is the link;
http://www.avsforumfaq.com/~plasma/#top