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From: larry moe 'n curly on 31 Jan 2010 13:07


John Corliss wrote:
>
> larry moe 'n curly wrote:
>
> CRTs, especially old ones, should be recycled at this point. They're not
> worth trying to save when they go out.
>
> > The best way to recycle electronics is by repairing it and keeping it
> > in operation. Other recycling is a joke and dumps lots of hazardous
> > waste into the environment, contrary to what the recycling industry
> > would like us to believe otherwise.
>
> Do you have any sources for your claims?

You, the person who made the absolutely ridiculous claim that monitors
put out dangerous radiation, is asking somebody else to prove his
claims???

Even 60 Minutes did a story about the appliance recycling industry
dumping old electronics into landfills overseas rather than actually
stripping the materials for reuse. >

> > Most monitor repairs are simple and cheap to people who know how to
> > solder and operate a volt-ohm meter.
>
> I disagree. Keeping a CRT in operation is like trying to keep accessing
> the internet with a Pentium-90.

A Pentium 90 is inadequate for most uses, but a CRT monitor can
probably provide a better picture than any LCD.

> Sure, you can do it, but the experience sucks. Not only that, but you will
> eventually destroy your eyes after years of putting up with the continual
> flickering, no matter how fast the refresh rate, of a CRT monitor. I know
> this from personal experience.

Like you know that CRT monitors put out dangerous radiation? ;)

> Working on a CRT, as others in this thread have warned you, can get you
> killed if you touch a high voltage capacitor for instance. Not only
> that, but if you actually succeed in turning on a CRT with it's cover
> off, you will be exposing yourself to dangerous radiation. Seriously.
>
> > You're right about the shock hazard but are completely wrong about the
> > radiation, unless you're referring to ancient color monitors
> > containing high voltage rectifiers consisting of vacuum tubes rather
> > than silicon diodes, and no way will the PLASTIC cover of a monitor
> > (usually the only cover there is) provide any protection against
> > radiation. Where did you get your gross misinformation about the
> > radiation, and why do you believe it?
>
> Some of the CRTs I've taken apart have shielding built into the plastic
> cover along with a big warning on the back of the cover that this will
> happen.

There is absolutely no x-ray hazard from any CRT monitor made since
IBM and Apple started to produce PCs because those monitors have
silicon high voltage diodes, not a vacuum tube diode, which in ancient
monitors and TVs was the only significant source of x-rays (and why
that tube was housed in a steel box). Picture tubes were also made
with glass that absorbed x-rays, but those x-rays were weaker and at a
lower frequency that were blocked by air. Furthermore CRT monitors
and TVs made since 1968 have been required to have special circuitry
to render the them unusable in case their high voltage went too high
and caused slight x-ray emissions from the CRT, and every TV and
monitor technician is quite familiar with it.

Any metal shielding you found in a CRT monitor was only for blocking
RF interference generated by the monitor, especially by the pulses
from the flyback transformer, which can cause the pictures on other
CRT monitors to twitch. Notice that even LCD monitors often have
metal shields around their power supplies and logic boards, and they
don't generate any voltages nearly high enough to generate x-rays.

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