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If the sound FLUCTUATES up & down, try turning off the AutoVolume in the sound menu.
You didn't say if it's one or all speakers crackling.
Crackling is either a speaker or circuitry issue. Adjust the balance away from the speaker that crackles, if it stops, that speaker is probably "fried". If it still crackles, I'd turn off the speakers and run the sound thru a stereo for the quick, cheap fix.
My Samsung (10+ years old to be fair) crackles due to a circuit issue but if I SMACK the left side speaker (behind which is the sound board and side panel connectors) it stops for a while. Maddening. I think I broke it squeezing it into the furniture it's in, pressing on the protruding RCA plugs. Dumb design.
I'm sure you have figured this one out. TV itself is causing the problems.
The circuit board that produces the audio signal seems to be the problem.
Before you call the repairman, go to the web site Shopjimmy.com just to get an idea of what the parts will cost. That way he doesn't rip you off.
I hope I answered your question correctly. Please rate me. :)
First thing would be to change the speaker. look at the back of the speaker and it will have 4 or 8 ohm rating replace with one of the same ohm and size from Radio shack. around $6 -
$9 if the sound still is a problem it will be the audio output IC
Dust does cause some problems but not this mabe bad audio ic or bad speakers or capacitor near audio ic or bad tuner could cause this sorry for so many suggestions I oun a video repair shop i gave you all the things it could be
It sounds to me as if possibly ya Main IC Amp Chip & OR the Output Capacitors are failing... Sometimes it is a sign of a power supply on it's way out... Either way it's time for a repair shop quote.
Either that or it may be the speakers crossovers... to check this, if you can, try another set of speaker... see if problem is still there. If it IS, then it IS most probably as I said above.. If NOT then it may be one or both of the "Crossover Network" in each speaker...