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From: I.C. Koets on 28 Jan 2010 21:27
My monitor (a DEC 21" CRT, older than dirt) has started to give sharp,
static-discharge type audible ticks, which are accompanied by short
distortions of picture and dimming. The picture distortion lasts for a
refresh cycle, the dimming can take a few cycles to disappear.

When I power off the screen, I hear a number of these ticks happening,
one after the other, tapering off.

Where do I begin to look for a solution? Google has not been much help.

Thanks!
From: philo on 28 Jan 2010 22:01
I.C. Koets wrote:
> My monitor (a DEC 21" CRT, older than dirt) has started to give sharp,
> static-discharge type audible ticks, which are accompanied by short
> distortions of picture and dimming. The picture distortion lasts for a
> refresh cycle, the dimming can take a few cycles to disappear.
>
> When I power off the screen, I hear a number of these ticks happening,
> one after the other, tapering off.
>
> Where do I begin to look for a solution? Google has not been much help.
>
> Thanks!



That's a hi-voltage breakdown


My advice is not to fool with it as the high-voltage is dangerous.

OK

now that you've insisted to ignore caution
you will need to open the monitor and observe where it's arcing
{turning the lights off in the room will help}



Now with the monitor off you can spray down the area with corona dope or
other suitable insulation.


NOTE: even with the power off and the unit unplugged...hi-voltage will
be retained!!!!


So you should not really fool with it
From: Kyle on 29 Jan 2010 01:20
On Thu, 28 Jan 2010 21:01:30 -0600, philo <philo(a)privacy.net> wrote:

>I.C. Koets wrote:
>> My monitor (a DEC 21" CRT, older than dirt) has started to give sharp,
>> static-discharge type audible ticks, which are accompanied by short
>> distortions of picture and dimming. The picture distortion lasts for a
>> refresh cycle, the dimming can take a few cycles to disappear.
>>
>> When I power off the screen, I hear a number of these ticks happening,
>> one after the other, tapering off.
>>
>> Where do I begin to look for a solution? Google has not been much help.
>>
>> Thanks!
>
>
>
>That's a hi-voltage breakdown
>

Exactly!!!! don't touch anything.. I hope he will not follow your
suggestions, while I know you want to help... hi-voltage can kill!

Bring the monitor to a qualified lab, if the reparation cost is too
much, just buy a new one.

New monitors are really cheap considering the models of years ago and
you can have a quality replacement without spending too much.

I suggest to just buy a new monitor...

--
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From: Brian Cryer on 29 Jan 2010 04:31
"I.C. Koets" <Nospam(a)please.com> wrote in message
news:54783$4b62478f$915e5cb0$29026(a)news1.tudelft.nl...

Ominous ticking ... its a bomb! (joke - sorry, couldn't resist!)

> My monitor (a DEC 21" CRT, older than dirt) has started to give sharp,
> static-discharge type audible ticks, which are accompanied by short
> distortions of picture and dimming. The picture distortion lasts for a
> refresh cycle, the dimming can take a few cycles to disappear.
>
> When I power off the screen, I hear a number of these ticks happening, one
> after the other, tapering off.
>
> Where do I begin to look for a solution? Google has not been much help.

Whilst I'm sure with the right know-how you might be able to fix it, unless
you really know what you are doing its probably not particularly safe to
poke around the insides of a CRT monitor given that there are some rather
nasty high voltages in there.

Time to buy a new monitor. You'll find with an LCD flat-screen monitor you
will be able to reclaim much of the desk space that your old CRT was taking
up.
--
Brian Cryer
www.cryer.co.uk/brian

From: John Corliss on 29 Jan 2010 06:06
I.C. Koets wrote:
> My monitor (a DEC 21" CRT, older than dirt) has started to give sharp,
> static-discharge type audible ticks, which are accompanied by short
> distortions of picture and dimming. The picture distortion lasts for a
> refresh cycle, the dimming can take a few cycles to disappear.
>
> When I power off the screen, I hear a number of these ticks happening,
> one after the other, tapering off.
>
> Where do I begin to look for a solution? Google has not been much help.
>
> Thanks!

CRTs, especially old ones, should be recycled at this point. They're not
worth trying to save when they go out. If you take it to a repair guy,
you'll probably wind up paying more to get it fixed than buying an LCD
would cost you. If you're low bucks, you might consider buying a refurb
at http://www.Geeks.com. Otherwise, LCDs have come down in price so much
in recent years that it's a very affordable choice. And your eyes will
thank you because thanks to LCD's latency, there is no flickering like
with a CRT (pass your hand rapidly back and forth in front of a CRT,
then an LCD, and you'll see what I mean.)

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.

--
John Corliss
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