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iPhones that won't charge are, unfortunately, very commum. Here are some easy, then harder steps to find out what is wrong with your phone, and how to solve the problem !
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            Your cable could be bad, try a new one, possibly MFI certified ! (Made For iPhone) Or try a known-good one. 
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            Try a new charging brick, or a known-good one that delivers at least 5V-1A 
 
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            Check your charging port, it could be really dirty or obstructed 
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            If it looks dirty, you can take the risk to insert a thin tool and try to pry out the dirt. I am not responsible for the harm you could do to your phone ! 
 
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            Try a known-good battery. Replace it if your phone charges again. 
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            Try a known-good Lightning charging port. Replace it if your phone charges again. 
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            I know, this is a picture of an iPhone 7, check the video for the 6S on the next step. 
 
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            The whole french version of the process, video does help if you are an english-speaker ! 
 
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            If you are still reading, bad news, you probably have a motheboard problem ! 
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            It's probably U4500, or Tristar that's causing it, it fails very frequently on iPhones. You'll have to replace it. 
 
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            Video tutorial for Tristar replacement on iPhone 6S 
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
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