"Mr. Lee" bravely wrote to "All" (01 Oct 03 15:41:00)
--- on the heady topic of "Toshiba model cn3281b vert problem"

ML From: "Mr. Lee"

ML What caps will cause problems with vert sweep like fold over at the
ML top of the screen and half sweep thanks!

If you have half a screen then the problem is more likely the vertical
output rather than a cap. Caps tend to show shrinkage rather than
outright missing halves but it may happen (rare) a cap opens completely.
Foldover is simply the vertical ouput clipping from either a low supply,
low gain, or an offset.

Vertical problems have become the bread and butter of the tv service
industry. I'm sure tv designers can make a vertical output that wouldn't
require any caps but it may mean the tv would last too long. In fact
with judicious design almost no electros would be needed in any circuit.
It's only a matter of convenience (and laziness?) since we're so used to
having them available. Example in the mid to late 70's DCCL amplifiers
finally achieved not having any capacitors in the signal chain at all.

Asimov
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