Re: Zenith SS2712VK9 Horizontal "Breathing"


I tend to define ?breathing? as a uniform, repetitional slow time
constant of change, while what you describe is random in its
occurrences.
Well with the SS we know it?s a sheltered model and with the 27 it has
a 27 inch pic tube,
and with a 12 suffix its at the very bottom of the design/features
line or a table model. But we still don?t know the manufacture age
?listed on the back model tag?. or the sets module complement. But
anyhow, going on in the blind. Have you observed a still/stable/fixated
enough pattern to ascertain if that hoz compression is squeezing in
equally from both sides. Or is there is a coke bottle type of side
compression, with the most compression being in the center and bowing
in less at top and bottom. If its the first symptom, the overall hoz
drive/sweep level is changing. If the latter you are experiencing a
cutting in and out of the pincushion correction circuitry.
I suspicion that you are starting to experience an intermittency of
connection in a solder joint on a hoz or pin ckt component that
inherently runs quite warm or carries a high pulsed current level thru
its path, or is in the close proximity of another warm running
component. What I might suggest is getting an ~ ¼-3/8 in dia solid
plastic rod that is ~ 1 ft long ( Venetian blind adjustment rod,
etc?[let your wife figure that one out?-12 in shorter rod]) . This will
provide a protective/insulated rod to tap upon suspected components
with. The set is operational with the back off and a stable still
picture from a cable bulletin board type of channel or the stable self
produced logo from a DVD player is utilized. Observing the reflection
on a frontally placed mirror , components in the hoz sweep and
pincushion circuit are light/moderately tapped while the pattern is
observed for compression to pinpoint a touchy component/ connection.
Positioning is referenced while viewing from the back of the set.
In most all Zeniths, the hoz sweep area and its components are at the
right rear area, working forward. The chassis/module with the most
troublesome pin circuitry is to the right front corner where there is a
troublesome pair, of a hot running pincushion diode and a vertically
mounted pincushion coil.
Lastly, and you do know *not* to French Kiss the very well insulated
red high voltage wire going up to the picture tubes top insulated ultor
connection from the high voltage transformer don?t you , otherwise you
will be safe by your using the isolation and distancing provided with
the acrylic rod.
If detected, a touchy part will justify an almost microscopic
inspection of its solder connections for it being almost floating
within its solder connection blob?thus necessitating a rosin fluxing
and a reflow soldering with fresh solder.
Standing by
73?s de Edd


--
Edd Whatley
.

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