Is done by technicians and often in the shop. There are a lot of folk looking for remote troubleshooting and so far I've yet to find any tech offer this.

So to do this on your own you would get out the service manual so you can see what parts do what and then track down the sound. I can't tell if this came from the set or speakers but that's something you have all over any remote help.

The service manual is at www.samsungparts.com for about 12 bucks (USA models) and more ideas at http://www.shopjimmy.com/tv-repair-tips

Once you have these and have guessed what board to try, find that board and swap it out. That's how it's done most of the time today.