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.
Pretty much, high volume is better explanation. By craclling I mean that its like old transistor quality or bad speakers when you hear like that membrane is tearing apart. When it gets warmer quality is back.
Update on this, my TV died like couple days after last response here. Motherboard was fried due to storm. They fixed it, it works. Sound is fine now so I wonder is audio part actually on that very same board which was causing issue after that storm where red light was up only for 2-3secs and I couldn't turn on TV at all.
Weird white flickering line on bottom before TV get warmed up is still here though. Weird.