No crud was visible in the Lightning port, and a quick blast with a can of compressed air didn’t blow out anything I could see, but even so, it solved the problem. Since I cleaned out the port, the iPhone charges properly with any Lightning cable, and with no pressure necessary. Others have reported using a paperclip or pin to clean out the Lightning port, but the compressed air approach seems safer.
This has happened twice already with my iPhone 5s. Neither time did I see anything blown out. I don’t recall ever having charging problems with my 30-pin iPhones, despite the larger receptacle.
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