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It's worth looking at the audio alignment. This TV has a "split sound" audio system, meaning that the audio signal is picked off quite early and the audio goes through its own sequence of IF amplification. The video signal undergoes a separate IF amplification sequence.
In some cases, where you have a fine picture but weak audio, the audio IF stages have simply drifted out of alignment with the video, so that you don't get the best audio at the same fine-tuning position as the best picture. Sometimes you can adjust the TV's fine tuner so that it gives the best picture, and then tweak the audio adjusters to improve the audio at that setting.
Phil Nelson
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