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Fault in the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit.Contact any service technician.If you wish to get some details; check the site linked here.Surf the site with patience.Pull up older posts. http://electronicshelponline.blogspot.com/
I think that the problem of your tv is the flyback transformer. The noise you are hearing is the high voltage, it is leaking from the flyback transformer. The smoke you see may came from the flyback or the capacitor. To be sure to the problem, try to remove the back cover of your tv but be sure to unplug it. Try to plug it, then turn on your tv but you should turn of the light so you could see the high voltage that is leaking but be very careful when doing it.
Most likely the high voltage transformer took a dive. If the picture was still good before it went out it is probably worth a check out fee. Another possibility is that there was a loose solder joint developing and moving the set around helped the loose joint come completely undone. Thanks
The sound could have come from one of your power capacitors. You could tell if one of them is no longer operational by looking at them; they will be burned, or blistered, or will be bulging. If this is a CRT type of TV ensure that you only look inside if you are fully aware of how to deal with the lethal voltages that are stored on the inside of the unit.