Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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iPhone 6 won't power on

My boyfriend and I had a completely broken iPhone 6 we bought to fix. We have fixed many phones before. The screen was shattered completely. And nothing lit up if plugged in. The power button was also damaged. So we bought a new power button and screen and replaced both. Well it still did not power on or even show it was getting charged. So we bought a new charging port we installed that today. Still nothing. Left it plugged in over a hour hoping it would work. The bottom of the phone where the charging port is was hot but nothing else and no sign of life. Also tried the hard reset test and we tried seeing if we unplugged the battery if it would boot loop to indicate bad battery. However nothing has worked. Any suggestions?

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Have you ever tried to check the battery connector in the motherboard with a multimeter or power supply?

You can check and try to put the motherboard into a microscope to see if the connector from the LCD is damaged.

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are you in dfu mode?

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The bottom of the phone where the charging port is was hot but nothing else and no sign of life.

What exactly is hot for you? "Burning hot, I can't keep my finger on it" or "it feels nice, kinda warm"?

The phone should not be "burning hot", except maybe the CPU under heavy processing. That is the most important clue. Phones that won't power on are usually experiencing a faulty battery, a bad charge port or a failure of the logic board. You should have ordered a battery at the same time as the charge port as the battery is always the most likely thing to fail.

That said, the heat at the bottom of the logic board could indicate a short circuit. As @solon said, you need to test to see if you have a short. Measure the resistance (unplug your phone first) between the two gold contacts in the battery connector on the logic board. Mine reads about 23KOhms but you don't want to see a short or really low value.

If you see a short, look for debris or damage with a magnifying glass or loupe. If you don't see a short, then try a battery first and if that doesn't work, consider finding a repair shop that does micro-soldering repairs.

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The iPhone 6 I acquired recently would not power on either. Not from the power button nor by plugging it in. I landed up removing the screen completely and of course all cables from that area. When I did that and plugged it in, I was greeted by a continuous set of two vibrations. So I unplugged it and started connecting one ribbon cable at a time and tested by plugging it back into power. Not realizing at first that the first two cables were for the digitizer and lcd, when I plugged in the 2nd cable and plugged in power, I finally got the Apple logo showing up and it booted. I powered it down and connected the third cable which gave me the same result. When I plugged in the fourth cable however, the phone refused to boot, so I found my issue. I noticed that there was some corrosion on that connector on the logic board so I cleaned it with some isopropyl alcohol and a toothbrush. When I plugged it back in, not only did the phone boot, but my home button worked again! Maybe this could be your issue as well. I hope it helps!

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