What do the plastic rings on the TV's CRT neck yoke do? Usually there
is more than a few and they are adjustable with tabs, I moved them
around; but they didn't change anything on the screen.

wrote in message
ups.com...
What do the plastic rings on the TV's CRT neck yoke do? Usually there
is more than a few and they are adjustable with tabs, I moved them
around; but they didn't change anything on the screen.


Well! Werent you lucky or what.
There are purity rings and convergence rings. Are you sure there is no
fringeing on the outer parts of the screen since you "adjusted" them? Or
maybe uneven colour across the screen!

Are you trying to fix it till it breaks?

wrote in message
ups.com...
What do the plastic rings on the TV's CRT neck yoke do? Usually there
is more than a few and they are adjustable with tabs, I moved them
around; but they didn't change anything on the screen.


Why on earth adjust something you do not undertstand? Those 'plastic rings'
are there to adjust the convergence (the as near perfect as possible overlap
of the red, green and blue images) when the CRT is manufactured. Each ring
affects a different beam or part of the raster, and each ring can be
dependent on the others, making setup very tricky. They generally do not
require adjustment as part of a service, and they certainly must never be
touched by unskilled hands. Unless you have set them back exactly where you
found them you will certainly have messed up the convergence, and even an
untrained eye should be able to spot convergence errors on a CRT. Look for
coloured fringes around edges, teletext can be useful for this if you have
it You may notice letters that should be crisp and white now have two or
three seperate coloured letters not quite overlapping properly.

Dave

Dave D wrote:

wrote in message
ups.com...

What do the plastic rings on the TV's CRT neck yoke do? Usually there
is more than a few and they are adjustable with tabs, I moved them
around; but they didn't change anything on the screen.



Why on earth adjust something you do not undertstand? Those 'plastic rings'
are there to adjust the convergence (the as near perfect as possible overlap
of the red, green and blue images) when the CRT is manufactured. Each ring
affects a different beam or part of the raster, and each ring can be
dependent on the others, making setup very tricky. They generally do not
require adjustment as part of a service, and they certainly must never be
touched by unskilled hands. Unless you have set them back exactly where you
found them you will certainly have messed up the convergence, and even an
untrained eye should be able to spot convergence errors on a CRT. Look for
coloured fringes around edges, teletext can be useful for this if you have
it You may notice letters that should be crisp and white now have two or
three seperate coloured letters not quite overlapping properly.

Dave

Hi...

If he's really, really lucky they may have had dabs of paint (nail
polish?) marking the original locations that he can use to return
them to their original positions

Course now we have computers and dvd burners, we can make our own
dvd's with dots and cross hatch patterns. Lots easier than in the
real old days carrying a huge, heavy B&K generator

Take care.

Ken

I think it would be more fun to explain to him how to set the rings.

Set like shaped tabs all together, At zero correction (make sure the
display doesn't change) move them in pairs away from each other so you
can get to them with those sausage fingers. (I swear the people in
those factories must have fingers the diameter of pencils)

On sets with four sets of rings set them like 90 degrees apart, three
sets, 120 degrees.

Determine which are the purity and set that first. If you have not
moved the yoke you can basically set those for the brightest picture,
but that is not perfect, slide the yoke back and adjust the rings for
equal purity error on each side of the raster. Alternately bring the
yoke into position and adjust the rings until the purity is perfect.

Hopefully everything else was in zero correction like I said, if not
you might have to repeat the whole procedure.

Now comes the good part, on a set with three sets of rings, the 4 and 6
pole ringsets will converge the red and blue to the green. One set of
rings should move the red and blue pretty much equally, the other set
will move them equally but in opposite directions.

Once you get the center set, then adjust edge convergence with the
wedges between the bell of the CRT and yoke. Move up and down for
"Xing" and laterally for vertical lines at the sides.

For a pro, once you get done with minimal frustration because you know
what your doing, glue the whole friggin mess together so nobody can
screw it up again, but wait, you must check purity on each axis
relative to the Earth's magnetic field, degaussing each time. DO NOT
use the glue until you have optimized the purity.

If you are not a pro who knows what he is doing, get frustrated, get a
sixpack of beer because now it has been pointed out to you and the
color fringes now DRIVE YOU CRAZY. Start cleaning your gun, but check
to see if it is loaded by pointing it at the TV and pulling the
trigger. (put the back back on it first)

Clean the gun and check the action. If it was not chambered before
cleaning those nasty color fringes will persist. Of course you check
the action by loading and chambering the weapon, how else can you be
sure ? You may remove the clip if you wish, and then, especially if you
have kids (do this while they are away) make sure the weapon is clear
by again pointing it at the TV and pulling the trigger.

If everything has gone right the TV will never again exhibit these
anomalies, such as color fringing or impure color. If the cops come,
don't answer the door. You need to go buy a TV before everyone else
gets home. Don't bother taking it to a pro who knows what he's doing,
these F______s are keeping the money in this country, we can't have
that. Don't you know there are poor slave laborers in China who need to
feed their families on $12 a month ? Besides, a TV shop will just check
it in and it could be a day or more before they get to it. This is not
immediate gratification, and not the American way.

When you get your new TV, do not take the back off. Remember what
happened last time.

JURB

Ezzaactly what I thought.... a great reply.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

ha escrito:

What do the plastic rings on the TV's CRT neck yoke do? Usually there
is more than a few and they are adjustable with tabs, I moved them
around; but they didn't change anything on the screen.

I hope you were trying this experiment on some crappy old supermarket
tv and not something actually worth repairing! ;-)
Ben.

Actually those are timing rings . They set up the sound so it matches
the peoples mouth .One set is adjusted so the tv lasts longer . Dont
move them to mutch .

LOL!

wrote:

I think it would be more fun to explain to him how to set the rings.

Set like shaped tabs all together, At zero correction (make sure the
display doesn't change) move them in pairs away from each other so you
can get to them with those sausage fingers. (I swear the people in
those factories must have fingers the diameter of pencils)

On sets with four sets of rings set them like 90 degrees apart, three
sets, 120 degrees.

Determine which are the purity and set that first. If you have not
moved the yoke you can basically set those for the brightest picture,
but that is not perfect, slide the yoke back and adjust the rings for
equal purity error on each side of the raster. Alternately bring the
yoke into position and adjust the rings until the purity is perfect.

Hopefully everything else was in zero correction like I said, if not
you might have to repeat the whole procedure.

Now comes the good part, on a set with three sets of rings, the 4 and 6
pole ringsets will converge the red and blue to the green. One set of
rings should move the red and blue pretty much equally, the other set
will move them equally but in opposite directions.

Once you get the center set, then adjust edge convergence with the
wedges between the bell of the CRT and yoke. Move up and down for
"Xing" and laterally for vertical lines at the sides.

For a pro, once you get done with minimal frustration because you know
what your doing, glue the whole friggin mess together so nobody can
screw it up again, but wait, you must check purity on each axis
relative to the Earth's magnetic field, degaussing each time. DO NOT
use the glue until you have optimized the purity.

If you are not a pro who knows what he is doing, get frustrated, get a
sixpack of beer because now it has been pointed out to you and the
color fringes now DRIVE YOU CRAZY. Start cleaning your gun, but check
to see if it is loaded by pointing it at the TV and pulling the
trigger. (put the back back on it first)

Clean the gun and check the action. If it was not chambered before
cleaning those nasty color fringes will persist. Of course you check
the action by loading and chambering the weapon, how else can you be
sure ? You may remove the clip if you wish, and then, especially if you
have kids (do this while they are away) make sure the weapon is clear
by again pointing it at the TV and pulling the trigger.

If everything has gone right the TV will never again exhibit these
anomalies, such as color fringing or impure color. If the cops come,
don't answer the door. You need to go buy a TV before everyone else
gets home. Don't bother taking it to a pro who knows what he's doing,
these F______s are keeping the money in this country, we can't have
that. Don't you know there are poor slave laborers in China who need to
feed their families on $12 a month ? Besides, a TV shop will just check
it in and it could be a day or more before they get to it. This is not
immediate gratification, and not the American way.

When you get your new TV, do not take the back off. Remember what
happened last time.

JURB




--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money" ;-P

wrote:
I think it would be more fun to explain to him how to set the rings.

Set like shaped tabs all together, At zero correction (make sure the
display doesn't change) move them in pairs away from each other so you
can get to them with those sausage fingers. (I swear the people in
those factories must have fingers the diameter of pencils)


Us Americans, with our fat fingers and large round eyes, can't do
anything right with t.v.s, ya'll.

(Joke, ha-ha.)