Power (sleep/wake) button not working

Hello all,

I bought a used iPhone7 and have found that the sleep/wake button does not work. This means I can’t power the phone on or off with the button either.

I replaced the power flex cable with spare flexes from two other phones and it still does not work. I took apart the power button assembly and made sure it was clean. The button makes a nice click when you press it and everything seems good to go.

I’m doubtful that all 3 power flexes were bad. Could this be a problem with the logic board?