Question about Sanyo DS27910 27" TV

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High pitched buzzing...

My Sanyo DS27910 has developed a high pitched buzzing, whining, or ringing after the set has warmed up. It seems to come from the cabinet and not the speakers. I disconnected the sattelite system,played movies on video1 output, played games on video 2 output,and the sound persists no matter what. This noise is driving me crazy and I can't stand to watch it for more than a couple of hours. Help me please!!!

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Noisey yoke? Listen thru an empty paper towel roll cylinder to isolate---

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