With the information you have stated, it would be best if you contact
Samsung Service directly in your region. They should be able to offer
live assistance and issue resolution for your device.
I have a 52" Series 6 LCD. It has been working fine. We recently hooked it up to the receiver for a surround sound. Today we moved into another room and hooked it up to another cable box without a receiver only to find out -- no sound is coming out of the TV. We tried resetting the sound to factory settings. We also tried holding the "Exit" button to reset the factory settings and that didn't work. Does anyone have any ideas what could be wrong?