No Power in my RCA TV.
There was a humming sound and then it just switched off and will not start again.
TV Technician told me that it was due to shorting out of Power supply which is a very usual feature of RCA TVs
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Power supply regulator section inside your tv has some sort of trouble. It doesn't starts. We cannot predict the exact resaons for this kind of problem. There are so many reasons. It can be rectified only with the help of a technician. You just go for an experienced technician, or inform your nearest authorised service center for your tv.
Sounds like the power supply has a bad capacitor. This problem can inject excessive 60 hz from the AC line into the vertical stabilizing picture system. The hum also my come from the same reason, bad or leaking filter capacitors. Cheaper just to buy a new TV or borrow another TV and connected to your system to see if the problem still occurs.
This indicates a problem in the power supply either the low voltage switching supply or the High voltage power supply. The sounds you hear is the shutdown circuit activating, I would not suggest that you try to repair this problem because of the dangers involved. I would suggest that you take it to a qualified TV repair shop. This problem should not cost you much, however it is the best choice for the problem you described.