This problem needs to be announced more, and I am livid.
I purchased several Televisions for Christmas, and set them up. I Flashed the firmware just like the others (Im a tech support rep so no I didn't do it wrong), and the sound is now gone.
Tech Support from Samsung was horrible. I spoke to a level 2 tech, and they said there was nothing they could do, and insinuated that it was my fault for flashing the tv to begin with. She told me that you should only flash your firmware and update it, when there is an issue with your tv that needs fixing. I argued that that was absurd, and she insisted that if you upgrade you firmware with one that is designed to fix certain problems, you will be causing yourself many problems like .. shutting off and on, monitor going black, sound going out, if you didn't have a problem to begin with.
She told me that there was no way to re-flash the unit, and that once firmware was updated, that the tv had to be serviced. And that would take some time.
I called again, and guess what .. I got the same exact response.
Asking if this was a common issue, and a known issue she said no.
I told her about other having this problem and asked if there was a way to downgrade the firmware, and I was told you simply cannot re-flash again. Guess what. Yes you can.
Upon first attempt, No. The system error will tell you that you cannot update your fw to the same version. Upon trying it 3 times in a row, the 3rd time it allowed a re-flash.
If we can somehow get the old firmware files, I think it would be problem fixed.
And even if for some reason the tv wont accept a downgrade, someone could edit a firmware file pretty quickly (10 mins) to make the system think it a new version.
If this problem is not resolved by tomorrow, I will never buy another Samsung Product again.