hr(bob) wrote:
On Feb 6, 12:03 pm, Arjan wrote:
On 6 feb, 17:26, Arjan wrote:





Hi,
I got a TV from somebody, a Sony KV-32WS3D (chassis AE-3)
The upper corners are very colored, see this picture from a teletext
page which should only contain the colors white and blue:http://img182.imageshack.us/img182/6980/dsc03030pg9.jpg
I checked the degauss coils: OK, PTC also OK, the degauss sound can be
heard when the unit is switched on
The deflection yoke was a little bit loose, when I moved it on the
neck of the CRT the colors on the screen are changing but I cannot
get the right colors in the upper corners, in every position of the
yoke, very strange....
There are no magnets from e.g. speakers in the neighbourhood.
The support rubbers for the yoke are still in place except one. But in
every position of the yoke there are colored upper corners....
There are more coils around the CRT: rotation coil. After
disconnecting this one, still bad colors
Another coil is connected to a small PCB at the right side of the
chassis.
Near the connector I read: CY+ and CY- Is this a convergence coil?
Convergence is still OK, only that colored corners...
(oh yes, sometimes several channels are not showing picture, only snow
or a snowy picture)
After a while the picture comes back. I think a bad contact inside the
tuner....)
I cannot believe there is something wrong with the CRT itself.....
Regards,
Arjan
correct link to the pictuhttp://img182.imageshack.us/my.php?i...c03030pg9.jpg- Hide quoted text -

- Show quoted text -

It is quite possible something is magnetized that is not within the
area of the internal degaussing coils. Try a strong magnet near the
worst corner and rotate it rapidly and continually while moving it
away from the set until you can't see any effect of the picture color
in the corner, Then move an additional 3 feet away before stopping
the rotating. See if that helps at all, then also degauss the set
again. Do that degaussing after the set has been idle/off for at
least 30 minutes to allow the degaussing components to start cold. I
personally always use an external degaussing coil whenever I am at all
suspicious about the interrnal cois as they do not put out a really
strong degaussing fiield.

Please post the results.

That's useful for a test, but anything that puts out a strong *AC*
magnetic field, like a soldering gun (not iron) or a bulk tape eraser
will work better. The permanent magnet might tell you if there's a
degauss issue, but you can't use it to fix the problem. I've actually
degaussed CRTs with the above.

Maybe a transformer? I dunno, I haven't tried that....

jak