As title say, I have that crackling noise on high tones until TV doesnt get warm. It's only first 3-5 minutes so I can't really do anything in terms of warranty but if gets worse I will. For now I'm trying to figure out what is cause of that ? It's pretty cold in room due to AC so about 20-22c, sometimes AC is pushing cold air in TV from behind/above so I wonder what part in TV can go wrong but still maintain quality after couple minutes pass. It's happening for 2 months so far.