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Thanks a bunch for the reply Craig. I think I fixed the problem. It was the big power transformer (part no: ATS7264) inside the receiver that was vibrating. The buzzing was mechanical afterall. The transformer is tied down using 4 screws securely.. but somehow, the bottom part of the transformer...

Is there any update to this issue? I have the same exact problem, except that my D509S buzzes very often now, pretty much everytime I turn it on. It used to be intermittent like the original problem described.. The cost of fixing it via service repair guy is quite expensive.. so I'm thinking...