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Got an iPhone 5 for display assembly repair. It also needed a new lightning dock, and power button. I replaced all three of those part, but the power button still won't work. A little confused as to why. It didn't appear as though the phone had been worked on, prior to me getting it
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If a confirmed known good power-mute-volume cable does not solve it, you probably have an issue with one of the components behind the SIM tray as already pointed out by @corklad or some other filter for that function, usually next to the power-mute-volume flat cable connector on the board.
In both cases you'll need micro soldering tools to fix it.
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have you checked at the back of the sim tray for any damaged components?
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Yeah. Those three black boxes? I'm still new to micro soldering, but it all looks intact. Again it was like this when I got it, and I noticed the user was using assistive touch for the power button, as the home button works perfectly fine. So it points to that being the issue, however, it looks fine, so I'm very uncertain as to what the issue is. I'll try to post a picture of it soon
Sorry I couldn't accept both of your answers
I once had one with a damaged component next to the SIM tray that wouldn't show up under 20x magnification.
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