I bought the tv at Walmart about seven months ago and it has worked fine until now . One evening after work I turned it on and it immediately started this cracking and popping noises from the back of the tv. I thought it was something where is was heating up to play, but the noise kept right on. So I thought maybe it was just a one time thing, but that was a week ago and it is still happening.
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I have had the same issue with a Westinghouse 50 inch LED TV. I believe it is not the power supply but the HDMI input. You can temporarily work around by plugging your primary source into the other HDMI. You may also get some relief by using the Westy remote, finding the TV menu, then selecting (Option) (Restore All). There may be an arcane procedure to reset the HDMI.
I have the exact same problem. It's a volume control issue. For me, when I turn my TV on and have it on low volume, it works fine (but sounds somewhat distorted). But once I turn the volume up to normal levels, the speakers crackle and then go out. I opened my tv and checked my speakers, and they were perfectly fine; not blown or anything. As well, the audio processor and circuitry didn't appear burned at all.
This used happened every few months for 30min or and hour at a time. Then, about 2 months ago, it happened again, and ever since then it still hasn't worked properly. The only way I got around this was by buying a cheap 2.1 speaker system, and connecting it to the audio output on the TV. Or you could buy a speaker bar or home theater system. I believe this issue has to do with problems with the circuitry in the audio amplifier, and there's not much you can do except add external speakers, or contact Sanyo if you still have an active warranty.
Depending on where you bought your TV (such as from walmart), its possible that the LCD panel was produced by Sanyo, but the electronics were done in China. Walmart does this with nearly every TV they sell.
This problem is quite common in this TV it's due to a capacitor in the power supply being overloaded. The chassis model is a ITC222. The capacitor is located on the deflection board which is part of the power supply and should not be touch by someone that does not have TV Repair Experience, due to the fact that this area of the TV is the most dangerous. I would suggest having a qualified TV repair technician do the repair on this TV. If the problem is just that one capacitor the part will cost about $2.50 at the most, so the charge will be the cost of the part plus the labor involved.
I hope this helps,