Theory: Nothing can damage a flyback, except itself

LyonsArcade

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Theory: Nothing can damage a flyback, except itself

What's everybody think? Is it possible for another component on a monitor board to damage a flyback? I don't know if I've ever seen one that was blown by anything other than itself (wears out, shorts internally, cracks open, etc.).

I just had a newer K7000 flyback explode and nothing else on the board was damaged, put a new fly in and it came right up.
 
Can you explain how a bad HOT kills a flyback? (I want to understand the path you laid out.)

Me too. And I'm not being sarcastic. I'm certainly not a monitor expert by any means but it was my understanding that when a HOT goes bad all it could really do is blow a fuse no?

It was also my understanding that if a flyback goes bad...then it's the opposite...it could take out half the chassis with it. (Arching and shorting backwards through circuits...etc)

The is an intriguing question and seems logical that the only thing that kills a flyback is itself.
 
Bad HOT kills Flyback ->

HOT goes short, fuse takes too much time to open (i.e. incorrect fuse, or maybe old/aged fuse), excessive input current thru primary winding of Flyback, primary windings overheat, insulation is compromised. This may occur in a very short timeframe. Result is that the Flyback is "ticking-time-bomb". Flyback may fail upon repair of HOT and fuse ... or ... dies sometime later and then takes out the HOT (i.e. Flyback kills HOT - which most are familiar with). Kinda a chicken-vs-egg scenario ... LOL
 
I've thought of that one before but I think it's a little bit iffy. You'd never be able to prove that the flyback wasn't what made the HOT fail in the first place.
 
If the Flyback is a crappy chinese knockoff (poor insulation; thinner gauge wires, bad potting etc) built with poor QA, then I'm sure the HOT could take it out. YMMV
 
What's everybody think? Is it possible for another component on a monitor board to damage a flyback? I don't know if I've ever seen one that was blown by anything other than itself (wears out, shorts internally, cracks open, etc.).

I just had a newer K7000 flyback explode and nothing else on the board was damaged, put a new fly in and it came right up.
I've had this exact thing happen when the new replacment k7000 flys fail. Funny part is one of them blew out so much smoke, my customers neighbor call the fire department. The new fly had roughly 10 hours of use. Replaced it with a used original one and the chassis was good to go.
 
The flyback provides several different voltages needed to operate the monitor. On the output sections of the flyback are several diodes and filter capacitors. A shorted diode or shorted capacitor can take out a flyback.
 
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