Dear Art,

I bought out most of the surplus from Advent and installed the first
1000A in a bar in NYC so I've been at this a while too.

If it is the STK module, how could it "follow the tube/yoke" when he
swaps the connections with say the red? Splain please?.

I have no experience with this unit in particular but, if it follows
the yoke when swapped with another color's (that would mean the yoke
is now connected to an STK module that IS working correctly), that
means it is a tube/yoke issue-not a deflection amp issue.

If there is a static magnet (like Sony is fond of) that has become
unglued due to heat, sometimes this can result.(Compare to the other
tubes and look for missing magnets)

Granted, linearity rings do not move by themselves and it's an odd
drop that moves them this much and only on one color. We don't know
the history and there could have been busy fingers at work before he
got it.

What is more likely is damage to the internal gun support. If it is
stable, a new setting of the linearity rings may help.

TMI


On Jul 27, 9:17 pm, "Art M - Artfromny" wrote:
I am almost 100% sure this is an amp problem; I fix 6 to 8 of these a week
and have only on one occasion had to change a convergence yoke, and it was
giving a decent picture but destroying the associated STK in a few days.

Also you need to bear in mind that there are 2 yokes per tube on many PTVs
one deflection and one convergence.

Also absent any moving or dropping of the TV there is no reason for the
magnets, rings, yokes, etc to have shifted from their proper positions.

I do this for a living, that doesnt mean I am always right (I am not) but I
would be surprised to be wrong on this one.

--

Art

"TMI" wrote in message

ups.com...



Since this follows the tube/yoke, I do not agree with the others on
this (unless the chip they describe is part of the yoke assembly).

At first, I assumed you had a mechanical allignment issue where the
blue tube is set too low and you are alligning above the linear region
of the raster. The cure for this is to adjust the tube to point higher
on the screen and re converge.

The correct proceedure is to center the raster on each tube, looking
into the lens, then adjust each tube mechanically for best on screen
overlay coverage, then proceed to electrical convergence.

The nature of the whip in your photo is curious and could be caused by
a shifted linearity magnet, some stray magnetic field or a cap within
the yoke failing. Check the rings on the neck end of the yoke, note
their position and swing them around a bit to see if it addresses the
problem. Look for missing or shifted bias magnets. As a last resort,
open the yoke housing and start replacing the caps inside, clean any
spark gaps etc.

Tom Maguire

On Jul 26, 11:07 pm, "Nick" wrote:
I've got a projection tv here with the blue gun having trouble.

It seems that theres some kind of curl.. or dip in the top. the bottom
lines
up perfectly fine. Is this some kind of yoke problem? I can't imagine
what
else would affect a tube like that..

The problem follows the tube when i switch the color inputs or the yoke
connectors..

Here's a picture to explain it
better.http://home.comcast.net/~slicknick1981/html/monitor.jpg

Thanks for any help,
Nick- Hide quoted text -

- Show quoted text -