10 Jul
2006
10 Jul
'06
2:25 p.m.
On Monday 10 July 2006 02:12 pm, Roy J. Tellason wrote:
On Monday 10 July 2006 01:48 pm, Barry L. Kline
wrote:
Oh, and if the supply for the vertical output circuitry _is_ flyback-derived,
then also look at the possibility of the diode being used to derive it
shorting out -- this would have both the effect of killing the vertical sweep
_and_ loading down the horizontal sweep at the same time...
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Jules Richardson wrote:
> Barry L. Kline wrote:
>
> I hate trying to fix displays :-)
Yeah...
I grew up fixing television sets in the family
business... thankfully I
don't do that schtick anymore.
I had a tv repair business in 1974, and also worked on them at later
points in time. Not something I'd particularly care to go back to any time
soon, either. :-)
I'd agree, the shrinkage of horizontal
deflection does make it less
likely to be the transistor, but I've seen it before and therefore it
would be my first choice to check.
It would be unlikely to be the transistor if it was opening up, but if it
was shorting it may be loading down the supply to the extent that it would
shrink the horizontal some. Or the supply for the vertical may be
flyback-derived, which would mean that a short there (whether it's a
transistor or a bad electrolytic) would load down the flyback a bit more.
But yeah, that's where I'd start looking too.