"Andy Cuffe" wrote in message
...
On Fri, 24 Mar 2006 13:51:42 -0800, "David Farber"
wrote:
With the yoke disconnected, and the HOT installed, doesn't the circuit
stop
oscillating? If so, wouldn't there have to be a measurable short in the
primary windings to ground for the flyback to suck the current? Are there
further steps I can take to isolate the flyback as the problem without
actually buying a replacement? Keep in mind that the flyback does ring ok
with my Dick Smith flyback tester.

Thanks for your reply.


Disconnecting the yoke, or even removing the HOT, has no effect on the
horizontal oscillator. Since there is base drive, you know the
horizontal oscillator is working. B+ goes directly to the flyback, so
if there was a short to ground it would overload even with the HOT
removed. It is possible for a flyback to ring ok and still be bad.
Is there any high voltage before it shuts down?
Andy Cuffe



What I meant was there should not be any oscillation on the primary side of
the flyback with the yoke plug removed.

My latest test was inserting a 75 watt lamp in series with the 135v supply
and reinstalling the HOT. The lamp lit up very brightly and my current meter
hooked up to the 135V supply measured 630ma. There is no high voltage and no
signal at the collector of the hot.

--
David Farber
David Farber's Service Center
L.A., CA