Arcing In Flyback Transformer
This Sharp CRT TV came in with the complaint of loud arcing sound inside the TV. Generally the only loud sound from a CRT TV is a bad flyback transformer. After in service for many years the flyback transformer can develop hairline cracks at the body in which the high voltage will arc to the ground.
It is very difficult to repair such problem. Eventhough you can cover it with epoxy at the external area, somehow it would not last long and will eventually arc again.
Arc coming out from the side of the flyback transformer (Arrow above)
The best solution is to replace with a new flyback transformer. It was a pretty straight forward job when comes to flyback replacement. Just solder it out and fit in the new unit.
The part number was F0147PE. From experience, after the replacement of flyback, please check for any loose connection or dry joints in the nearby circuit before you turn the set on.
Conclusion- A Television that came in with arcing problem usually can be solved easily provided if you have the replacement part. Make sure you replace with the same type and part number of flyback. If you use an equivalent flyback, the display width sometimes can be too small or too big.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Albert van Bemmelen
October 7, 2019 at 10:04 pm
Excellent service! These parts are most likely no longer sold in my and other European countries. A friend of mine tried to find older flyback transformers for old crt-sets but he could no longer buy them. It is incredible that some countries provide almost everything even including the rewinding of defect transformers.
In this case replacing the flyback transformer seems the only thing to do, but it would be safer also to check the output with a good HV voltage probe. These HV Probes are quite expensive but in Everyday Practical Electronics was an article how to make one. If the screen like you mentioned becomes larger or smaller that could be an indication the voltage is wrong and maybe too high generating X-rays instead. A higher voltages means a shorter time the faster emitted electrons are under influence of the tube's deflection coil.
Parasuraman S
October 7, 2019 at 10:50 pm
Excellent. The strange co-incidence is that I too escaped from a fire hazard caused by an FBT right under my nose! I am covering it in an article. In my case, the arcing with fire was splashing out. Good job there! Thanks for sharing!
Yogesh Panchal
October 12, 2019 at 11:33 pm
Quick Fix Suranga.