Sony KV-24FV300 shuts down.

ok.

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

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

Thanks for your reply.

Why not?

Leonard

ring

observations.

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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

snipped-for-privacy@gmail.com

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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.

stop

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 and deflection yoke plug. 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.