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derf
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Bernorenard Posted messages 7776 Registration date Status Membre Last intervention -
Bernorenard Posted messages 7776 Registration date Status Membre Last intervention -
Hello, I have a Grundig TV and since my last move, the image disappears for a brief moment with initially small noises like a neon light struggling to turn on, and now there are louder noises that sound like firecrackers being thrown on the ground! I think the cathode ray tube is about to fail! Could this be dangerous as the noises are getting louder and louder! Thank you for your information! derf
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4 réponses
Hello
don't worry, as long as it pops once in a while, it's relatively not dangerous. There are very high voltages in a color cathode ray tube television. It's about 25,000 volts on the anode connector of the cathode ray tube (commonly called the suction cup = in the middle and above). It's highly likely that over time the insulators begin to degrade, dust accumulates, and kitchen grease, etc. An electric arc may occur from time to time between the connector and the graphite of the tube, which is grounded; that's the crackling you hear. It's also the warning signal: you need to, with knowledge, discharge the tube once the TV is turned off, then remove the anode connector and clean the glass (the non-graphitized area around the anode connector) and the insulator with a product like denatured alcohol (a powerful degreaser). Let it dry well, of course, and turn it back on. It works, well great, because an electric arc can turn into a crackling sound like a machine gun, the plastic melts under the heat of the arc, and that can be very serious (fire with combustible materials and implosion of the cathode ray tube = injuries and guaranteed fire). The "triple" is the electronic component that generates the high voltage (25 kV) and can also start to malfunction as it ages and must be replaced without fail; it can also degenerate and lead to disasters. So, we don't take risks with aging technology; either we repair or we throw it away. In any case, your cathode ray TV won't last long because TNT will soon eliminate analog TV, and then your old TV will be useless.
bye (and sorry, everything has to end)
don't worry, as long as it pops once in a while, it's relatively not dangerous. There are very high voltages in a color cathode ray tube television. It's about 25,000 volts on the anode connector of the cathode ray tube (commonly called the suction cup = in the middle and above). It's highly likely that over time the insulators begin to degrade, dust accumulates, and kitchen grease, etc. An electric arc may occur from time to time between the connector and the graphite of the tube, which is grounded; that's the crackling you hear. It's also the warning signal: you need to, with knowledge, discharge the tube once the TV is turned off, then remove the anode connector and clean the glass (the non-graphitized area around the anode connector) and the insulator with a product like denatured alcohol (a powerful degreaser). Let it dry well, of course, and turn it back on. It works, well great, because an electric arc can turn into a crackling sound like a machine gun, the plastic melts under the heat of the arc, and that can be very serious (fire with combustible materials and implosion of the cathode ray tube = injuries and guaranteed fire). The "triple" is the electronic component that generates the high voltage (25 kV) and can also start to malfunction as it ages and must be replaced without fail; it can also degenerate and lead to disasters. So, we don't take risks with aging technology; either we repair or we throw it away. In any case, your cathode ray TV won't last long because TNT will soon eliminate analog TV, and then your old TV will be useless.
bye (and sorry, everything has to end)
derf
Thank you very much for all these details.
