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I actually saw one of these blow up once.
A. TV was working fine.
B. All of a sudden, it lost horizontal sync and the picture pulled in from the sides.
C. A few seconds later, I heard a loud BANG followed by smoke and a severe odor.
When I opened the set, the flyback had a huge crack all the way around the case with little pieces of it's internal copper windings hanging out the side.
When the flyback shorted and blew up, it took the horizontal output transistor, the B+ regulator, and the fuses with it.
Sometimes, they will develop a hairline crack in the case. When this happens, HV leaks out and can arc to the metal heatsink. Other times, the area around the crack will carbonize and the transformer will burn, stink, and smoke until the power is killed.
Other times, the flyback will create no fourth of July exhibit or show any signs of it being defective. It will simply short and the HOT will blow before it has time to blow up.
What I described is not limited to Samsung TV's. I've seen it happen alot with Goldstar, Panasonic/Quasar, KTV, Sampo, Emerson, AOC, Kawasho, and other "low end" brands of TV's from the '80's and early '90's.
And, you'll want to be careful when buying a new flyback. It's best to stick with an OEM part, when available. I you have to go with a generic brand, HR-Diemen are generally the best. Try to stay away from "no name" generic brands that are sold ultra cheap from discount parts houses. I've had those blow up within hours of installing them. So, it's best to spend a little more and get a reliable part. I've had more than my share of cheap knock-off parts that either failed to function at all; or, died shortly after installation.
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