Phone sensors aren't working

My phone none of the sensors are working? Which part I should replace? Is this a motherboard part?

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I'v got a similar issue too. Happened to me after the may "security" update. Is there a way we can fix this through software too?

https://www.youtube.com/watch?v=-Bw4Et6W...

From this video it seems that there isn't any replacement involved.

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