Hi,
This seemed the only appropriate place to post this.

I currently have a Sony Wega KV-27FV300. It sits upon a regular TV stand with a swivel stand directly under the TV. I have a cable box about a foot underneath the tv, separated by wood. With a game system, DVD player, VCR, and tuner system about 2 feet below the tv. Now I tell you this because I think it might have something to do with the problem I am having.

When my TV sits pretty parallel to the TV stand, meaning none of the TV hangs over the edge it is fine. But, when I use the swivel and tilt it severly so that the TV hangs over and winds up almost 65 degrees to the TV stand it produces a greenish/purplish discoloration (depending on the background) on the left corners of the TV. When I swivel so TV faces left, the discoloration appears in the bottom left corner. Facing right, it appears in top left corner.

When I turn TV back to the main viewing area the discoloration is slight, but there and I have to unplug TV and plug in again to reset and discoloration vanishes. I recall this also happening to another Sony 27 I had prior.

Does anybody know what the hell I am talking about and is there anything at all I can do?? Please help!!!
Thanks in advance to anyone with help and/or feedback.

Green and purple means the TV is being affected by a magnetic field. It could be a speaker, a transformer inside another component, or the Earth.

To figure out the cause, try this: place the TV in the position that makes the discoloration strongest, and them move the other components, one by one.

Larry
www.fineelectricco.com

there are no speakers even close to the tv and the components are all below and not easily moveable. they are usually not even on when this happens if that matters. i figured it was a magnetism thing.
tell me something...if I keep it going as is..meaning live with the discolorations, etc..will that have any negative effects on the tv long term?

try this...

turn the tv off, then back on...once in whatever posistion you want it in at any given time...you alrwady alluded to this solveing the problem in the main posisition...it should also work in these others!

most TV's have auto-deguassing circuits in them, and they do so each time they are turned on..

larry is right...the slightest change in position while the TV is on can affect it, so try pivoting first then turning on...

also, is it anywhere near a rock wall, fireplace, etc...?

do ANY of you components have hard drive in them? PVR, Tivo, etc...?

avdude

AVDude, some Sony's (at least my model) need to be unplugged then back in for it to degausse.

tomato....tomatoe?

black...white?

you know what I mean!

GOOF

avdude

Hey I might know tomatoz from tomaatos, but they might not. I was just clearing it up.

Thanks for all the answers...it looks like i will have to live with the problem..no rock wall or fireplace near it and i dont think turning off before turning is a likely option..but TELL ME..
will this cause any long term damage?

Thanks again.

I also think its from Moving the TV when its on.
It could be that the deguassing themistor is not working properly if you un plug the TV over night and dont move the screen then turn it back on again not moving the set and the colur set patches are still there i would call the store or a service engineer.

Bob

Had the same issues on some shitbox set. Try DEGUASE or how ever its spelled. It clears the magnetic field from the screen. If after you clear it, it apears again, than there is somthing in the room effecting it.

Once the screen is infected, sometimee even after the field is gone, the effect stays unlessed deguased!

- No charge for that one.

mitsubishi B series sets which had a motorised base had a deguass buton but most sets do not.
if you have to have the set manually deguassed with a coil or probe often this is a sign that the deguassing themistor is not working.

Assuming you have tried moving components around once you see the problem, and that had no effect;

and as you have no speakers anywhere nearby;

the problem is indeed a magnetic field. I would have simply told you that it is the earth's magnetic field, which is about a half of a gauss (the fields in speakers where the voice coil is are on the order of a thousand or two thousand gauss).

The key is that, with a Sony, that horrible mechanical noise that most of them make when you turn them on is the internal degausser, a large coil that decreases any permanent magnetization of the tube each time you turn on the TV.

If the tube gets magnetized a lot, it will take several on/off cycles to clear it. These cycles cannot be done rapidly; the coil takes a lot of current and the TV will not turn it on over and over again to keep it from overheating. I have not tested this, but it would probably take about twenty minuets (or minutes, which is a shorter time) (love those typos) after you turn the TV on before the degaussing coil will work again.

So the key is not to rotate it after it is turned on. Bring it out, swivel it, then turn it on for best effect of the degaussing coil.

This discoloration will not cause any long-term damage. You can always degauss the tube. There is a slight possibility, I guess, that doing this repeatedly may mean the tube will be harder to degauss, but the degausser in the set is a real wimp compared to a TV repairman's degaussing coil.

So don't worry, be happy, but swivel before you turn on.

Just to pitch in a couple of pennies' worth:

It's actually the shadow mask, the perforated steel plate behind the phosphors, that takes on the magnetism, and is what gets neutralized by a degaussing coil, whether built in or hand-held.

Larry
www.fineelectricco.com

ohh behave!!

my themistor will take on your coil any time .
this time its thermistor 2 judgement day .. the coloration wont be back!!