iPhone 6 turns off moments after locked

I've already changed the battery, the motherboard and update the software , apparently everything is working perfectly.

The phone works normal but when I lock the screen (or wait to lock by himself) moments later it turns off, and only turns on with hard reset.

i don't know what to do anymore

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Maybe a bad power button / flex assembly? Maybe the phone is still on but you can't unlock it? Can you unlock it with the home button?


it turns off completely, the power button its ok.... and yes i can unlock with the home button..... when it is locked and goes for 5 seconds without unlocking it, it turns off