The heart rate does not show

The smartwatch stopped showing heart rate , the pulsing green lights have stopped working. The steps counter however is working and time is shown correctly. Any suggestions ?

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Is it under warranty? Reviewed the manual? Tried tech support (online, email, call center)?

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The green lights are what collect the heart rate data. LEDs are shocking reliable, but the drivers that switch the power often are not. I doubt that there is a way to repair it in a modular fashion.

If the heart rate monitor is important to you, you should replace the watch.

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