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There is something shorting inside, possibly due to moisture collection. First, change input device to some other and see, if it works fine, the problem is with the input device. If you notice same problem, this may need attention by a qualified service technician.
Most likely the TV has a power supply related problem. It's very possible that it maybe a bad capacitor or transformer on the power supply board that made the loud noise. But, I can't say it's 100% the problem because I can'tactually look at the tv over the internet. I can only make guesses with the symptom.
You have a few choices: 1. If by chance the TV is still under warranty, go that route. 2. If you have some electronic experience, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you red light flashing codes, circuit diagrams, test points, and part# lists.Usually, cost under $20. And most cases the new part cost less than $15. 3. Pay a TV shop to do the repairs. It maybe costly, but get an estimate of how much they will charge. That way you can decide if it worth repairing or replacing the whole TV. I hope I shed some light on the subject for you.
You should check your home wiring and grounding. Also be aware of anything that has recently been turned on when this happens. Anyone using a microvwave, cell phone, or other appliance that might be causing the interference.
Wow. This is more comon than I thought. My 50" Vizio plasma just went out as will after a loud pop noise. Power button is still lit. Sound continue to come through but no picture. I will dig into it and see if I can find a appropriate solution.