If you are using Alexa on your TV, the chiming sound is coming from an external device such as your cell phone or a tablet. Your external device is constantly getting notifications from Alexa, therefore your TV picks it up and makes the chiming sound. Yes it is annoying. It's an easy fix: open the app on your external device; go into settings; then disable all notifications by turning off all the buttons even for all the amazon accounts. Once they're all off the problem is solved.
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