I've had the same crackling sound, but mostly the audio just goes out and won't come back on until I turn it and leave it off for several minutes. When I called Samsung Customer Service, they told me to try replacing the cables. I switched from the HDMI connection to a cable connection and it worked fine for about a couple of months, now the sound is going out again, I switched back to HDMI and still no sound. The customer service at Samsung is horrible and I will never by another Samsung product again. Were you able to find a solution to your problem?
Ok, I got this TV and it had been great. But, sometimes when I turned it on and it was set to a particular input, but the device that was connected to that input wasn't turned on, I'd hear an awful loud crackling/rumbling sound until I turned the device (i.e. cable box) on. No problem, I got used to turning on the device before the TV.
BUT, last night while watching cable tv, the audio started crackling/rumbling and there was no tv audio anymore. Instead I just had this crackling/rumbling noise. The sound persisted when I switched inputs between hdmi/component, etc., whether or not any device was even connected to the input that was selected. The sound only stopped when I "muted" the tv, not even when I lowered the volume to zero, manually. I turned off the tv and turned it on again, and it was fine for a few seconds until it started again. I cut power to my entire system, waited 10 minutes, started it up again, and now it's been fine. But, I'm scared there's a problem that will recur and that it's only a matter of time.
Any thoughts at all from anyone?????? Any advice whatsoever would be greatly appreciated!