AVS Forum Addicted Member
Join Date: May 2002
Location: Collingswood, N.J.
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Removing the back of the set is not difficult. About 10 screws on the perimeter and one sneaky one over the panel where the coax connects.
IMHO, if the "sound" only occurs when the set is ON. One (or more) of the cooling fans are either failing or caked with dust/grime.
I'd unplug from wall power, remove the back, take a look at the blades of the fans and carefully try to clean the blades with a vacuum and a brush attachment.
If you can’t explain it simply, you don’t understand it well enough – Albert Einstein