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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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Standby only turns the set on and you have sound so there isn't an issue with that, although 7 volts is a little high but it may be an inaccurate meter..try the flashlight test and see if you can see an image