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These blinks (flashes) are fault indication. By the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside the TV. Count the blinks occur at one time switch ON, carefully. Do it once again, and make sure about the number of blinks. If the flashes are continious, non-stop, the main system control IC should be suspected. If you wish to get more details, check the site linked here. It has blinking codes detail to many brand TVs. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
<span style="mso-bidi-font-family: Arial">Let verify first to narrow down to where the problem can be. First, make sure the MUTE function is not activated, and then check the on screen sound set up menu to make sure the speakers are not set to OFF. If the setting is OK, then attach the powered PC speakers to the Audio Line out RCA jacks (Red and White) to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. Please post back what you find.</span><br />
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It sounds like the main board has gone out. The only audio components are the main board, wiring and speakers. Since audio is missing from external speakers as well, that tells you that the main board is at fault. The cost of the board could be from $150.00 to almost $300.00 depending on the version # of your unit and dealer mark up. You can call 1-800-samsung for nearest service center.
1- check all the cables that are hooked up to the TV
2- try to get audio to and external speakers or home theater (to check the sound card).
3- if the step # 2 don't work either you have a bad sound board on your TV.
4- opn the TV try t get the part # of the board, and replace it
Same thing just happened to me contacted Vizio had me unplug the TV from the wall for about a minute and then replug and cut the TV back on and everything was fine. I have the television hooked into HDMI1.