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Diagnose circuit board issue

Started by AK July 11, 2019
    I am trying to diagnose why the door chime no longer works.

    The receiving unit sounds the various melodies.

    The battery voltage is ok.

    I have thoroughly cleaned the circuit board.

    The led lights up when the switch is pressed.

    Any other things to try next?

    Thanks.

    https://imgur.com/a/cZH4n5U