"Leonard Caillouet" wrote in message
...

"David Farber" wrote in message
...

"David Farber" wrote in message
...
This Sony KV-24FV300 powers up for about a second, then shuts down. The
front panel l.e.d. shows a blink code of two blinks. According to some
older information on the web, the two blinks indicate a B+ over current
protection. I cannot find any shorts in the set. Flyback and H.O.T.
ring
ok.
Does anyone know of any common faults with this set?

Thanks for your reply.

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



After further investigation, I've come up with the following
observations.

With all plugs and boards attached, the set powers up and about a second
later my AC line current measurement spikes to over 2 amps and the set
shuts
down.

Removal of the deflection yoke plug does not change the situation. Set
still
shuts down.

With the HOT removed, and everything else plugged in, the set powers up,
the
135 volt supply is normal, and it doesn't shut down. The drive signal to
the
base of the removed HOT is a nice sawtooth, about 6 V p-p. The blink
code
changes to four blinks which I believe means no vertical deflection.

So my question is, can a bad flyback suck a lot of current even though
the
deflection yoke plug is not attached?

Why not?

Leonard



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