Can I replace the heart rate sensor on my Samsung gear 2

Got a Samsung gear 2 and I think my heart rate sensor at the back ain't working anymore because it doesn't light up wen I try to use the fitness features on my watch .So I want to know how do i go about replacing my sensor I think the sensor is build into the motherboard of the watch so will I have to replace the hole motherboard

Answer this question I have this problem too

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