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Registered Member #822
Joined: Mon Jun 04 2007, 09:36PM
Location:
Posts: 7
Well this is probably a odd thing but I recently got a TV Flyback Transformer. I tested it to find which leads were the coils and after finding what i thought to be the primary attached it to a 120v AC line. After a second it blew smoke and enamel out a small hole around the ferrite center. After that i was unplugging stuff and it would click even after being disconnected, 30 minutes later. What was caused this to happen and is it still usable??
Registered Member #610
Joined: Wed Mar 28 2007, 09:44PM
Location: Middletown, RI
Posts: 110
I'm not quite sure that any flyback transformer from a television set would survive being plugged directly into the wall. You probably vaporized the primary, and I'm sure the thing is dead especially if you saw material being removed from it. The clicking might have been the discharge of the magnetic energy stored in the gap? maybe a thirty minute delay indicates how much you saturated the ferrite?
Most flybacks are driven by high frequency circuits on the order of tens of volts.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
Its definitely dead, chances are the secondary was also ruined from the heating. And the clicking may have been caused by thermal contraction from cooling after you so violently heated the core and epoxy/insulation.
Registered Member #180
Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187
I once was trying to run a flyback, I forget exactly how I was driving it now... but similar thing happend. The core started to buzz all of a sudden and then exploded into two pieces and shot out of the flyback with a puff of smoke. After the core was hot for a long time and I guess some resin melted or something because I couldn't go back downstairs for a while due to the smell... scared the crap out of me when it happend haha.
Registered Member #822
Joined: Mon Jun 04 2007, 09:36PM
Location:
Posts: 7
lol. Well my testing time was also about 12 o'clock and I was half asleep but the test leads that ran from the transformer to my tester got a good coating of enamel.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
If you're half asleep you have NO business playing with high voltage, Flyback, NST, MOT, or otherwise.
Take this as Tough Love from someone who has had their fair share of shocks in the past as an experimenter, researcher, I have been there. Respect the HV.
Registered Member #610
Joined: Wed Mar 28 2007, 09:44PM
Location: Middletown, RI
Posts: 110
Back in the day, my co-worker was telling me about a time when he used to repair television sets. For some debugging reason he needed to test the set while it was fully powered. He accidently got too close to the flyback output and he received a spark to the head. He woke up 2 days later in the hospital, very dizzy. (I suppose its one thing to get zapped in your finger as opposed to your brain).
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Question about a Flyback TV Transformer
