Power button not working - randomly

Hi,

The power button of my iPhone SE (2016) stopped working 2 weeks ago, out of nowhere. No shock or anything. The phone had never been opened.

I checked the software, hard reseted, updated, reinitialized, nothing fixed it.

It was time to fix the hardware. I ordered a new flex cable and changed it. Didn’t work either…

Just to be sure I didn’t break the flex cable while replacing it, I got another one. Before replacing it again, I checked first if the button worked just by connecting the flex cable and pressing the button. It worked! So I took the time to replace it again, and it worked once the phone closed.

Sadly, there is a next. A week later, not working again!

Out of curiosity, I just connected the flex cable I thought I had broken, and the button works!! So I suppose the flex cable in the phone works as well, and the problem is somewhere else

I noticed that when the button doesn’t work, I can’t turn off/on the phone. When I try to turn it off, it turns on right away and got stuck in an infinite boot loop until I connect it to a lightning cable

Any idea what’s going on!?

• When the flex is in the phone, it doesn’t work, or for just a few days
• When the flex is connected on the fly, it does work
• Infinite starting loop when the button doesn’t work

Thanks