Clock does not turn on

The clock worked without problem for a long time, suddenly it hasn't turned on anymore, it doesn't show a screen, the usb connector has no power, it's totally dead. Does anyone know if this is due to something special?

Update (10/01/2022)

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Can you disassemble the clock and upload pictures of the circuit boards? 在已经存在的问题里加入图片

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@andrewsawesome I have added it to the answers

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@Jony Jimenez Do you have a multimeter?

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@andrewsawesome Yes, I have

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@Jony Jimenez If you put your meter into AC Volts, what is the voltage coming out of the power brick?

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