On Sunday, March 27, 2011 11:26:56 AM UTC-7, Sean Hamilton wrote:

Is it likely that bad solder joints would cause vertical foldover in a
mid-90s CRT television?

Yes. The first place to look is the big fat pins that the deflection
yoke connector plugs into. Unplug the yoke connector
from the main board before reflowing the solder, it can
get stuck permanently if you don't.

Usually, the hint of bad solder joints is in sensitivity to
vibration (give it a whack, it works for a while). Overheated
switch transistors and bad coupling capacitors can also
kill vertical sweep, and if the screen only has half the
vertical sweep range, it could be a push-pull amplifier
is now only a push. Or only a pull.