My Radius Intellicolor 20e has recently developed a problem where the
entire screen is "fogged over" with a layer of green. This was
occasional at first, but now it is seldom that it displays a proper
picture without the green covering it. Upon rotating the monitor to its
side, this fog becomes blue, and upside-down, the very top of the screen
starts to become red.

I've read this group's excellent monitor repair FAQ and I know what to
look for when checking inside, but is the fact that the color varies
when I rotate the displace indicative of anything? I'm afraid it's the
CRT but I thought I'd get an opinion here before figuring out how to
check inside.

Thanks!

R.J. Hemme wrote:
I've read this group's excellent monitor repair FAQ and I know what to
look for when checking inside, but is the fact that the color varies
when I rotate the displace indicative of anything?

Perhaps the simplest thing it is indicative of is the monitor being in a
magnetic field. Any local changes lately that could cause that?

Once I was asked to diagnose a case where all the monitors along one wall
would sporadically have their displays do the "hula." It took a while, but
the cause turned out to be that the wall was next to an elevator shaft, and
as the cars went past, they would disrupt the magnetic field.

--
John Miller
Email address: domain, n4vu.com; username, jsm

Power corrupts. Absolute power is kind of neat.
-John Lehman, Secretary of the Navy, 1981-1987

John Miller wrote:

R.J. Hemme wrote:

I've read this group's excellent monitor repair FAQ and I know what to
look for when checking inside, but is the fact that the color varies
when I rotate the displace indicative of anything?


Perhaps the simplest thing it is indicative of is the monitor being in a
magnetic field. Any local changes lately that could cause that?

Once I was asked to diagnose a case where all the monitors along one wall
would sporadically have their displays do the "hula." It took a while, but
the cause turned out to be that the wall was next to an elevator shaft, and
as the cars went past, they would disrupt the magnetic field.


I wish it were that easy. I've recently moved; the monitor started
acting up in the old place, and has continued here. None of the same
devices are around it so I doubt it's external interference. I've tried
it in different locations of the house with no luck.

While location doesn't matter, orientation does. Changing whether it is
upside-down or not never fixes the problem, but it does change the
color. It seems to like to be green when you first turn it on, no matter
which side is up, but turning it will change it to blue or red until the
next time it is turned on. The change is not gradual; rather, there is
an area when turning it that is going from green to blue and from blue
to red.

On Mon, 26 Jul 2004 08:57:53 -0400, "R.J. Hemme"
wrote:

My Radius Intellicolor 20e has recently developed a problem where the
entire screen is "fogged over" with a layer of green. This was
occasional at first, but now it is seldom that it displays a proper
picture without the green covering it. Upon rotating the monitor to its
side, this fog becomes blue, and upside-down, the very top of the screen
starts to become red.

I've read this group's excellent monitor repair FAQ and I know what to
look for when checking inside, but is the fact that the color varies
when I rotate the displace indicative of anything? I'm afraid it's the
CRT but I thought I'd get an opinion here before figuring out how to
check inside.

Thanks!



It sounds like a problem with the degaussing circuit. The fact that
this monitor can be rotated means it has to have a more complicated
degaussing circuit than the usual thermistor circuit. It must be able
to degauss itself every time it's rotated between landscape and
portrait.
Andy Cuffe

Andy Cuffe wrote:

On Mon, 26 Jul 2004 08:57:53 -0400, "R.J. Hemme"
wrote:


My Radius Intellicolor 20e has recently developed a problem where the
entire screen is "fogged over" with a layer of green. This was
occasional at first, but now it is seldom that it displays a proper
picture without the green covering it. Upon rotating the monitor to its
side, this fog becomes blue, and upside-down, the very top of the screen
starts to become red.

I've read this group's excellent monitor repair FAQ and I know what to
look for when checking inside, but is the fact that the color varies
when I rotate the displace indicative of anything? I'm afraid it's the
CRT but I thought I'd get an opinion here before figuring out how to
check inside.

Thanks!




It sounds like a problem with the degaussing circuit. The fact that
this monitor can be rotated means it has to have a more complicated
degaussing circuit than the usual thermistor circuit. It must be able
to degauss itself every time it's rotated between landscape and
portrait.
Andy Cuffe


Well, it's not exactly meant to be rotated. I don't know a lot about
monitor repair so I thought I'd try simple things like thwacking the
side and moving it around before having a look inside. Figure out as
many symptoms as possible.

This monitor is fairly old the controls are just a series of lights that
let you know what you're controlling and buttons. There doesn't appear
to be a degauss option. Could it just be that the screen isn't
degaussing automatically like it should, or would it be more serious
than that?

Thanks!

R.J.

R.J. Hemme wrote:

Could it just be that the screen isn't
degaussing automatically like it should, or would it be more serious
than that?

Well, I've tried manually degausing with a permanent magnet with no
effect. When near the monitor, one pole of the magnet will change the
green fog to blue fog , and the other pole will change the green to red,
but the fog remains there in all circumstances.

I've also tried swapping the red, green, and blue connectors in the
monitor. While the colors are obviously quite different under the fog,
the fog still appears green, so whatever is producing the fog effect
must be after that component or else the fog would have changed colors, too.

Any ideas, or does this sound like the tube going bad? Thanks...

R.J.

R.J. Hemme wrote:
I've also tried swapping the red, green, and blue connectors in the
monitor. While the colors are obviously quite different under the fog,
the fog still appears green, so whatever is producing the fog effect
must be after that component or else the fog would have changed colors,
too.

Any ideas, or does this sound like the tube going bad? Thanks...

Yes. If you can devise a way to rock or jostle (safely) the set while it's
on, you can get an idea whether gravity is a factor. If so, suspect
something loose in or around the tube.

--
John Miller
Email address: domain, n4vu.com; username, jsm

Real Time, adj.:
Here and now, as opposed to fake time, which only occurs there and then.

Well, I've tried manually degausing with a permanent magnet with no
effect.

Any ideas, or does this sound like the tube going bad? Thanks...

R.J.

You may have to try an AC electro magnet to degauss the tube. I use to use
a Weller soldering gun in a pinch. The inductive type. Pull the trigger,
circle the screen and keep backing off until you get about three to five
feet away. This should take you 15 to 30 seconds to complete. Then let go
of the trigger. Rinse and repeat.

The AC field should de magnetize or Degauss the CRT elements.

Good luck.
Paul