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My audio for my Westinghouse vr4085df went out. I took it apart and I need to know which part controls the audio so I can replace it. It is not just the speakers either since I have surround sound and still not working. Any suggestions or answers would be helpful. Thank you

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My audio for my Westinghouse vr4085df went out. I took it apart and I need to know which part controls the audio so I can replace it. It is not just the speakers either since I have surround sound and still not working. Any suggestions or answers would be helpful. Thank you

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