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Hi Larry and welcome to JustAnswer,
Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, the described symptom almost always is an internal hardware issue.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?
Perhaps more importantly, would you be comfortable working on the inside circuitry? ...LIVE!