Have you tried adjusting the audio output in the game console? It's not always the television that produces a crackling sound.
Turn off the 5.1 channel setup in the ps3 audio setup and it will usually fix the problem. I have my own theories of what is causing it (since I can't back it up, I won't post it), but to say that "Samsung knows" isn't necessarily the case.
Cracking sound from tv speakers only when playing blueray movies from ps3.
The tv is brand new, just bought it last december six months ago.
Apparently the cracking sound issue is well known....have read that samsung gladly replaces the ic/power unit in the tv but haven't heard of anything fixing it.
Appears like Samsung knows what the problem is but for some reason wouldn't disclose the root cause or fix the issue for good.
Anyone out there experiencing the same issue with Samsung LCD when playing blueray.