My TV is going a bit kaput - any advice as to why?

[dee]

I have a JVC tv bought less than a year ago so I will go and have it
fixed under warranty - but with it being so close to Xmas I just wanted
to try and make sure my tv won't die on me during the holidays....
Anyway any advice as to what is happening with my tv would be
greatfully received.... Basically in the bottom corners of the screen
there seems to be a colour distortion - like a creeping colour varying
from greens to purples....does this mean the tube is going? pls help

 

[James Sweet]

I have a JVC tv bought less than a year ago so I will go and have it
fixed under warranty - but with it being so close to Xmas I just wanted
to try and make sure my tv won't die on me during the holidays....
Anyway any advice as to what is happening with my tv would be
greatfully received.... Basically in the bottom corners of the screen
there seems to be a colour distortion - like a creeping colour varying
from greens to purples....does this mean the tube is going? pls help

More likely it means you've got something magnetic, like a set of stereo
speakers too close to the TV. Otherwise the degaussing coil needs to be
fixed assuming the TV hasn't been dropped.

 

[dee]

thanks James - nearest speakers are about 5 feet away - that's okay
isn't it? - the only things near are my VCR, digital box, radiator and
champagne bottle - but tv is 28" and hasn't been moved in 11 months
although the speakers were brought in at the weekend...could it be
that? - thanks so much

 

[[email protected]]

More than likely when the speakers were carried by, they got too close
to the tv set and magnetized it.

Probably a simple matter to have the tv properly degaussed without even
opening it up will fix the issue. You may also need to have the
radiator demagnetized if it is close to the tv as it is probably
magnetized a bit from the close proximity to the speakers as well when
they were carried in.

Just schedule to have the technician come out and look at it to confirm
the magnetization and degauss the set if that really is the issue.

 

[James Sweet]

thanks James - nearest speakers are about 5 feet away - that's okay
isn't it? - the only things near are my VCR, digital box, radiator and
champagne bottle - but tv is 28" and hasn't been moved in 11 months
although the speakers were brought in at the weekend...could it be
that? - thanks so much

It's worth trying to degauss it, there may have been a nearby lightning
strike or some other magnetic source at some point. If you have a bulk
tape eraser or one of those big Weller soldering guns you can use either
one as a degaussing wand, or just buy the real thing, I found mine for
$10 on ebay a while back.

 

[**THE-RFI-EMI-GUY**]

You can degauss it by simply turning on and off a few times, just
make sure it is left off a few minutes to cool the internal degausser
before turning back on.

More than likely when the speakers were carried by, they got too close
to the tv set and magnetized it.

Probably a simple matter to have the tv properly degaussed without even
opening it up will fix the issue. You may also need to have the
radiator demagnetized if it is close to the tv as it is probably
magnetized a bit from the close proximity to the speakers as well when
they were carried in.

Just schedule to have the technician come out and look at it to confirm
the magnetization and degauss the set if that really is the issue.

--
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

 

[James Sweet]

You can degauss it by simply turning on and off a few times, just
make sure it is left off a few minutes to cool the internal degausser
before turning back on.

Unless the degaussing circuit is broken or it's too severely magnetized.

 

[Dave D]

I have a JVC tv bought less than a year ago so I will go and have it
fixed under warranty - but with it being so close to Xmas I just wanted
to try and make sure my tv won't die on me during the holidays....
Anyway any advice as to what is happening with my tv would be
greatfully received.... Basically in the bottom corners of the screen
there seems to be a colour distortion - like a creeping colour varying
from greens to purples....does this mean the tube is going? pls help

Almost certainly your TV needs 'degaussing'. What has happened is the
'shadow mask', a metal mesh screen just behind the glass inside the tube,
has become magnetised and the electron beam gets disturbed by the magnetism.
This can be caused by having speakers or other sources of magnetism too
close to the screen, or by a faulty degaussing circuit in the TV itself. It
can also be caused by a nearby thunderstorm believe it or not!

Either way, the problem is usually neither difficult nor expensive to
remedy, unless the problem was caused by dropping the TV, which can
permanently damage the shadow mask. If it's caused by a magnet nearby, the
TV repair man will wave a special device called a 'degaussing wand' near the
screen which will remove the magnetism from the screen. If there is a fault
in the TV's degaussing circuit, the most common failure here would likely be
a device called a 'degaussing thermistor', which is a relatively cheap and
easy to replace component.

Once the source of the problem is addressed, it is not likely to return soon
provided you ensure no sources of magnetism are too close to the screen.

To answer your last question, no, it is very unlikely there's any permanent
damage to the tube, unless you have dropped the TV.

Dave

 

[[email protected]]

You can degauss it by simply turning on and off a few times, just
make sure it is left off a few minutes to cool the internal degausser
before turning back on.

This may work or more likely will not help if it was due to the
speakers being carried close to the tv set.

Modern tv set degauss circuits are no where near as strong as they were
years ago. They are designed to demagnetized anything caused by the
earth's magnetic field, not magnetism from large speakers that were
carried to close to the tv set. I have yet to see a tv set made in the
last 10 years that has a degauss circuit that will take care of a
strong magnetization problem from something other than the earth's
magnetic field.

If the tv had simply been turned on its axis and the problem showed up
from that in one and maybe the opposite corner, then the internal
degauss would be expected to take care of it after several cold turn on
starts.