Electronics

Mark · Guest

Hi,
A friends' Sony KV-F29SZ2 has an unusual fault,
especially for a TV with a Trinitron type tube. The
convergence is terrible for the top 1/4 of the screen,
mainly out horizontally.
None of the convergence or purity magnets has moved
from their original positions. There was a minor purity
error which was fixed by a slight re-positioning of the
yoke.
Rocking the yoke up & down to adjust top & bottom
middle convergence was tried when the purity was
tweaked. The only effect was to put the bottom out & not
benefit the top at all.
This convergence fault effects the top ONLY. There is
no provision of a dynamic convergence adjustment for just
the top as there was/is for some of the other types
of tubes.
The de-gaussing coil is working OK and whether the
sub-woofer is 'docked' in its normal position on top of the
TV or is removed makes no difference-as it shouldn't.
I'm wondering if anyone has an idea what the
problem may be & possibly a solution?

Regards,
Mark.

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