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Req: Help with a 19" TV purity problem

T

Tim

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over a year old.

If the set is put on a stand that has a metal object (like a Satellite
Receiver on a shelf) mounted within 8 inches below the set, the pic has
a very noticeable purity problem all the way across the bottom and about
1/2 way up each side. If I raise the set up, the purity problem will
diminish, but even up at 8" away from the console stand, it still has
slight purity issues.

Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it is a
reflection from the set or radiated magnetic fields from the equipment
below.

The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.

Any helpful suggestions are appreciated.

Thanks,

- Tim -
--
 
B

bz

Jan 1, 1970
0
Tim said:
OK, this is a problem with a 19" Citizen TV. It is just over a year old.

If the set is put on a stand that has a metal object (like a Satellite
Receiver on a shelf) mounted within 8 inches below the set, the pic has
a very noticeable purity problem all the way across the bottom and about
1/2 way up each side. If I raise the set up, the purity problem will
diminish, but even up at 8" away from the console stand, it still has
slight purity issues.

Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it is a
reflection from the set or radiated magnetic fields from the equipment
below.

The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.

Any helpful suggestions are appreciated.

I assume that this is a CRT tv, not a LCD or plasma tv.

Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.

A transformer can also radiate a[n AC] magnetic field that disrupts nearby
devices.

If you can find the source of the magnetic field and move THAT away from
the TV, it should fix the problem.

It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.

Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]






--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

[email protected] remove ch100-5 to avoid spam trap
 
T

Tim

Jan 1, 1970
0
Tim said:
OK, this is a problem with a 19" Citizen TV. It is just over a year old.

If the set is put on a stand that has a metal object (like a Satellite
Receiver on a shelf) mounted within 8 inches below the set, the pic has
a very noticeable purity problem all the way across the bottom and about
1/2 way up each side. If I raise the set up, the purity problem will
diminish, but even up at 8" away from the console stand, it still has
slight purity issues.

Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it is a
reflection from the set or radiated magnetic fields from the equipment
below.

The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.

Any helpful suggestions are appreciated.

I assume that this is a CRT tv, not a LCD or plasma tv.

Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.

A transformer can also radiate a[n AC] magnetic field that disrupts nearby
devices.

If you can find the source of the magnetic field and move THAT away from
the TV, it should fix the problem.

It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.

Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it, nor
does it have a large transformer. The purity problem is static, that is
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.

Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection if that's
the case.

It would be nice if this set had a manual degaussing option, but alas it
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.

Thanks,

- Tim -
 
B

bz

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over a year
old.

If the set is put on a stand that has a metal object (like a
Satellite Receiver on a shelf) mounted within 8 inches below the set,
the pic has a very noticeable purity problem all the way across the
bottom and about 1/2 way up each side. If I raise the set up, the
purity problem will diminish, but even up at 8" away from the console
stand, it still has slight purity issues.

Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it
is a reflection from the set or radiated magnetic fields from the
equipment below.

The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.

Any helpful suggestions are appreciated.

I assume that this is a CRT tv, not a LCD or plasma tv.

Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.

A transformer can also radiate a[n AC] magnetic field that disrupts
nearby devices.

If you can find the source of the magnetic field and move THAT away
from the TV, it should fix the problem.

It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.

Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it, nor
does it have a large transformer. The purity problem is static, that is
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.

Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection if that's
the case.

It would be nice if this set had a manual degaussing option, but alas it
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.

Lacking an eraser, if you can hang a magnet on a string so that you can
spin it, you can sometime degauss with that.

I had a nice heavy magnet from an old radar magnetron that had a hole in
just the right spot.
I had a loop of copper wire threaded through the hole and hung the
contraption from a piece of string.
I would wind it up good and let it spin, slowly moving it away from the
monitor.
Did a good job of degaussing.

Sometimes, for a joke, I would spin it on the other side of a wall, near
someones monitor.
They would come running out of their office "something strange is happening
to my monitor. The picture is wobbling all over the place and changing
colors!" :)


--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

[email protected] remove ch100-5 to avoid spam trap
 
H

hr(bob) [email protected]

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over a year
old.
If the set is put on a stand that has a metal object (like a
Satellite Receiver on a shelf) mounted within 8 inches below the set,
the pic has a very noticeable purity problem all the way across the
bottom and about 1/2 way up each side. If I raise the set up, the
purity problem will diminish, but even up at 8" away from the console
stand, it still has slight purity issues.
Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it
is a reflection from the set or radiated magnetic fields from the
equipment below.
The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.
Any helpful suggestions are appreciated.
I assume that this is a CRT tv, not a LCD or plasma tv.
Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.
A transformer can also radiate a[n AC] magnetic field  that disrupts
nearby devices.
If you can find the source of the magnetic field and move THAT away
from the TV, it should fix the problem.
It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.
Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it, nor
does it have a large transformer. The purity problem is static, that is
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.
Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection if that's
the case.
It would be nice if this set had a manual degaussing option, but alas it
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.

Lacking an eraser, if you can hang a magnet on a string so that you can
spin it, you can sometime degauss with that.

I had a nice heavy magnet from an old radar magnetron that had a hole in
just the right spot.
I had a loop of copper wire threaded through the hole and hung the
contraption from a piece of string.
I would wind it up good and let it spin, slowly moving it away from the
monitor.
Did a good job of degaussing.

Sometimes, for a joke, I would spin it on the other side of a wall, near
someones monitor.
They would come running out of their office "something strange is happening
to my monitor. The picture is wobbling all over the place and changing
colors!"   :)

--
bz      73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

[email protected]   remove ch100-5 to avoid spam trap- Hide quoted text -

- Show quoted text -

The OP did not say if the stand was metal or not. If it is metal, that
may be adding to the problem. The spinning magnet to degauss is an
old trick that works well as long as it is spinning rapidly compared
to how fast you are moving awa from the set.
 
T

Tim

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over a year
old.
If the set is put on a stand that has a metal object (like a
Satellite Receiver on a shelf) mounted within 8 inches below the set,
the pic has a very noticeable purity problem all the way across the
bottom and about 1/2 way up each side. If I raise the set up, the
purity problem will diminish, but even up at 8" away from the console
stand, it still has slight purity issues.
Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it
is a reflection from the set or radiated magnetic fields from the
equipment below.
The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.
Any helpful suggestions are appreciated.
I assume that this is a CRT tv, not a LCD or plasma tv.
Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.
A transformer can also radiate a[n AC] magnetic field  that disrupts
nearby devices.
If you can find the source of the magnetic field and move THAT away
from the TV, it should fix the problem.
It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.
Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it, nor
does it have a large transformer. The purity problem is static, that is
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.
Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection if that's
the case.
It would be nice if this set had a manual degaussing option, but alasit
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.

Lacking an eraser, if you can hang a magnet on a string so that you can
spin it, you can sometime degauss with that.

I had a nice heavy magnet from an old radar magnetron that had a hole in
just the right spot.
I had a loop of copper wire threaded through the hole and hung the
contraption from a piece of string.
I would wind it up good and let it spin, slowly moving it away from the
monitor.
Did a good job of degaussing.

Sometimes, for a joke, I would spin it on the other side of a wall, near
someones monitor.
They would come running out of their office "something strange is happening
to my monitor. The picture is wobbling all over the place and changing
colors!"   :)

--
bz      73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know isan
infinite set.

[email protected]   remove ch100-5 to avoid spam trap- Hidequoted text -

- Show quoted text -

The OP did not say if the stand was metal or not. If it is metal, that
may be adding to the problem. The spinning magnet to degauss is an
old trick that works well as long as it is spinning rapidly compared
to how fast you are moving awa from the set.
The stand is wooden. The shelf is merely a 3/4" press board with
arborite on the top. The lower shelf has 3 devices stacked up on it,
with the satellite receiver on the top of the pile, and about 1" away
from the bottom of the shelf the tv sets on. The whole thing is only
about 21" wide and about 3 feet tall.

- Tim -
 
P

philsvintageradios

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over a year
old.
If the set is put on a stand that has a metal object (like a
Satellite Receiver on a shelf) mounted within 8 inches below the set,
the pic has a very noticeable purity problem all the way across the
bottom and about 1/2 way up each side. If I raise the set up, the
purity problem will diminish, but even up at 8" away from the console
stand, it still has slight purity issues.
Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it
is a reflection from the set or radiated magnetic fields from the
equipment below.
The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.
Any helpful suggestions are appreciated.
I assume that this is a CRT tv, not a LCD or plasma tv.
Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away.
A transformer can also radiate a[n AC] magnetic field  that disrupts
nearby devices.
If you can find the source of the magnetic field and move THAT away
from the TV, it should fix the problem.
It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.
Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it, nor
does it have a large transformer. The purity problem is static, thatis
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.
Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection if that's
the case.
It would be nice if this set had a manual degaussing option, but alas it
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.
Lacking an eraser, if you can hang a magnet on a string so that you can
spin it, you can sometime degauss with that.
I had a nice heavy magnet from an old radar magnetron that had a hole in
just the right spot.
I had a loop of copper wire threaded through the hole and hung the
contraption from a piece of string.
I would wind it up good and let it spin, slowly moving it away from the
monitor.
Did a good job of degaussing.
Sometimes, for a joke, I would spin it on the other side of a wall, near
someones monitor.
They would come running out of their office "something strange is happening
to my monitor. The picture is wobbling all over the place and changing
colors!"   :)
--
bz      73 de N5BZ k
please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.
[email protected]   remove ch100-5 to avoid spam trap- Hide quoted text -
- Show quoted text -
The OP did not say if the stand was metal or not. If it is metal, that
may be adding to the problem.  The spinning magnet to degauss is an
old trick that works well as long as it is spinning rapidly compared
to how fast you are moving awa from the set.

The stand is wooden. The shelf is merely a 3/4" press board with
arborite on the top. The lower shelf has 3 devices stacked up on it,
with the satellite receiver on the top of the pile, and about 1" away
from the bottom of the shelf the tv sets on. The whole thing is only
about 21" wide and about 3 feet tall.

- Tim -- Hide quoted text -

- Show quoted text -


try putting a sheild between, see what you can find, a sheet of
alunimum might be enough. sheet of tin that is grounded might be even
better.
I have screwed up a couple of TV's by playing with magnets near them,
never had much success with degaussing them that way but I am sure it
is possible.

Phil
 
T

Tim

Jan 1, 1970
0
OK, this is a problem with a 19" Citizen TV. It is just over ayear
old.
If the set is put on a stand that has a metal object (like a
Satellite Receiver on a shelf) mounted within 8 inches below the set,
the pic has a very noticeable purity problem all the way across the
bottom and about 1/2 way up each side. If I raise the set up, the
purity problem will diminish, but even up at 8" away from the console
stand, it still has slight purity issues.
Raising the set up on boxes is problematic, as the space is very
limited. I would like to shield whatever it is. I am not sure if it
is a reflection from the set or radiated magnetic fields from the
equipment below.
The console is in a travel trailer, so I cannot move everything away
from the tv, as most of the electronics are in this one console, with
the TV on top of it.
Any helpful suggestions are appreciated.
I assume that this is a CRT tv, not a LCD or plasma tv.
Sounds like the 'metal object' contains a strong magnet or has been
magnetized.
I have some magnets that will effect a CRT from over 2 feet away..
A transformer can also radiate a[n AC] magnetic field  that disrupts
nearby devices.
If you can find the source of the magnetic field and move THAT away
from the TV, it should fix the problem.
It is possible that putting the set in place and then 'degaussing'
everything in the vicinity will 'fix' the problem.
Does your Satellite receiver have a built in hard drive for recording
programs? It is possible that the drive is 'leaking' a strong magnetic
field [but most hard drives confine the field very well]
Yes the TV is CRT, and no, the receiver does not have a HD in it,nor
does it have a large transformer. The purity problem is static, that is
it does not change colour, so I don't think it's a transformer, as that
would cause a rainbow effect.
Maybe I'll try rearranging the "stack" of components to see if one of
the other devices cause less magnetic radiation, or reflection ifthat's
the case.
It would be nice if this set had a manual degaussing option, but alas it
doesn't. I don't even hear the coils buzz when the set comes on, but
there are no other purity issues, so they must be functional. I'll take
my tape eraser down with me, and try that to see if the problem returns
after zapping the screen.
Lacking an eraser, if you can hang a magnet on a string so that youcan
spin it, you can sometime degauss with that.
I had a nice heavy magnet from an old radar magnetron that had a hole in
just the right spot.
I had a loop of copper wire threaded through the hole and hung the
contraption from a piece of string.
I would wind it up good and let it spin, slowly moving it away fromthe
monitor.
Did a good job of degaussing.
Sometimes, for a joke, I would spin it on the other side of a wall,near
someones monitor.
They would come running out of their office "something strange is happening
to my monitor. The picture is wobbling all over the place and changing
colors!"   :)
please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.
[email protected]   remove ch100-5 to avoid spam trap- Hide quoted text -
- Show quoted text -
The OP did not say if the stand was metal or not. If it is metal, that
may be adding to the problem.  The spinning magnet to degauss is an
old trick that works well as long as it is spinning rapidly compared
to how fast you are moving awa from the set.

The stand is wooden. The shelf is merely a 3/4" press board with
arborite on the top. The lower shelf has 3 devices stacked up on it,
with the satellite receiver on the top of the pile, and about 1" away
from the bottom of the shelf the tv sets on. The whole thing is only
about 21" wide and about 3 feet tall.

- Tim -- Hide quoted text -

- Show quoted text -


try putting a sheild between, see what you can find, a sheet of
alunimum might be enough. sheet of tin that is grounded might be even
better.
I have screwed up a couple of TV's by playing with magnets near them,
never had much success with degaussing them that way but I am sure it
is possible.

Phil

In the past I have tried using Aluminum to shield against RF, but
haven't had much success with that. I will try a grounded sheet though,
maybe that will work better. The worse case is that it makes the problem
even worse, but it will go away the next start up.

- Tim -
 
B

bz

Jan 1, 1970
0
try putting a sheild between, see what you can find, a sheet of
alunimum might be enough. sheet of tin that is grounded might be even
better.
I have screwed up a couple of TV's by playing with magnets near them,
never had much success with degaussing them that way but I am sure it
is possible

Shielding against a DC magnetic field REQUIRES a ferris material. The
stronger it is picked up by a magnet, the better.

Mu-metal is the best kind of shielding.

Aluminum, whether grounded or not, will have no effect. Neither will
copper.
You need something that will 'short out' and 'contain' the magnetic field.

On the other hand A conductor WILL give some shielding for AC magnetic
fields. The degree of shielding depends on the frequency of the AC.
The higher the frequency, the easier it is to shield against an AC field
with a GOOD conductor of any kind.




--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

[email protected] remove ch100-5 to avoid spam trap
 
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