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Posted by panteltje on 11/07/07 15:58
On 7 nov, 15:39, jakdedert <jakded...@bellsouth.net> wrote:
> pantel...@yahoo.com wrote:
> > On 7 nov, 01:36, "Bob Myers" <nospample...@address.invalid> wrote:
> >> "Jan Panteltje" <pNaonStpealm...@yahoo.com> wrote in message
>
> >>news:fgqhir$v9j$1@news.datemas.de...
>
> >>> On a sunny day (Tue, 6 Nov 2007 12:20:43 -0700) it happened "Bob Myers"
> >>> <nospample...@address.invalid> wrote in
> >>> <fgqeu2$5c...@usenet01.boi.hp.com>:
> >>>> The shortest-lived component in terms of useful service
> >>>> life is, of course, the tube itself.
> >>> I think not.
> >>> I have had a TV repair shop for many years.
> >>> CRT replacement is relatively rare compared to other problems,
> >>> like HV, bad joints (thermal), dried out electrolytics, etc.
> >> Read what I said again - the CRT is the shortest-lived
> >> single COMPONENT.
>
> > No, I doubt that, as I mentioned electrolytic capacitors, solder
> > joints
> > due to thermal stress, all have a shorter life.
> > It depends a bit on how you define 'life' in this case,
> > a bit less brightness from CRT phosphors is easily compensated by
> > a bit more drive (say contrast) and or brightness.
>
> Nevertheless, at some point, the crt will become unviewable...period.
> Bad caps, solder joints and all the rest will be easily and reliably
> corrected. Crt's absolutely *will* wear out and be economically
> unobtainable at some point.
Nobody disputed that, ANY component will wear out actually.
But CRT does not need (and is not likely) to be the first.
Wake up, did you ever do TV repair work?
And if so were you one of those who charge a new CRT each time they
fix a solder joint (those companies exist even today).
My impression is you never did any TV / monitor repair.
> >>> My Samsung Syncmaster CRT did 6 years at 12 hours a day (makes
> >>> 25632 hours) before I retired it (it is in the attic) this
> >>> summer, with NO noticeable decrease in anything (brightness,
> >>> white balance, contrast, convergence etc).
> >> You checked it by eyeball, or did you actually measure the
> >> brightness?
>
> > Well, If you were to do this right, then you would have:
> > For a new set, measure beam current, and luminance for
> > a red, green and blue screen.
> > Also measure EHT, and focus voltages, screen voltages on the tube.
> > Then after say 25000 hours measure it again.
> > And to see if it is phosphor you'd have to increase beam current
> > for the same brightness, if you need more beam current (with all
> > other parameters equal) for the same brightness, then it is likely
> > phosphors.
> > etc.
> > In this case I did not do that clearly, but I have fixed lighting and
> > what I normally did, is set white to the same brightness as the CRT
> > monitor frame.
> > That is a very precise point, (does not work with the LCD it has a
> > black case).
> > But you could use a piece of white paper.
> > Any loss of light output would have to be compensated for by a
> > different
> > knob position of contrast.
> > (Set black first with brightness, then white with contrast).
> > I also had a Philips monitor, that needed more and more brightness,
> > finally opened it up, adjusted the screen voltages and focus.
> > Samsung monitors are in a quality range that I am very happy with..
>
> All obfuscation and beside the point.
No, I simply answered your question, and in technical detail.
You have some strange idea, and you wannabee right.
You are not.
> At some point, every crt which is
> used will become eventually untenable, no matter how much you crank it.
> Fact...indisputable.
Yea, we all know that, same for your pizza.
> Despite all advantages/disadvantages of the various styles of display
> technology, the market will follow the demand. Demand is dictated by
> initial cost, overall quality and life expectancy. Crt's are on their
> way out. If the technology survives at all, it will be at a cost that
> will not be affordable by the average user.
>
> Period.
That is no news either.
> Now...as the OP asked, what will you be using when that happens? For
> myself, that's a question which can't be answered with any certainty. I
> expect I'll eventually switch to lcd. I've already converted to some
> degree, as I have at least a couple of laptops that I use regularly.
> That said, I've got a number of crt monitors that I use daily and unless
> I run out of storage space, I have enough spares to last for a while.
> In the interim, very likely some new technology will emerge that will
> compel me to jump a generation and avoid converting to lcd for my main
> display.....
>
> jak
In production (of video material) it would be a good idea to at least
have a means to see what the people at home will see.
And, as LCD is now becoming commonplace, you will need a LCD for that.
You can wait for the laser projector or the 3D brain implant, enjoy it
when you get one (2200?), but it is of no use when you want to do
something NOW.
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