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Re: rca televison RCA D27649
This looks like the audio amplifier or the audio processing circuitry might be malfunctioning. To troubleshoot this you may have to use audio injection and detection to troubleshoot this problem. You would inject a known good audio signal and detect it throught the circuit. Since it looks like you are unable to control or have very little control over the audio. I would lean more towards the audio processing circuitry as being the problem.
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First check to make sure that the audio isn't "Muted". Second, Go into the user menu and check to make sure that the "Melody or Chime " is turned "on". Third, Turn the volume up half way.Fourth, Turn "off" the set. You should hear a "Down" Melody or chime. Next turn "on" the set. If you did hear the Melody when you turn the set "on" or "off" then the audio system in the set is ok. If you did not hear the Melody then the Main bd needs to be replaced. Have a trained Samsung tech repair your set.