I know this is a relatively old thread, but I have had a few cell phones that have had the usb charge port begin to fail. It might be worth looking both on YouTube and Ebay to find a new charge port assembly and a good tutorial on it's replacement. I have done replacements on samsung galaxy phones for the cost of the port circuit, usually under $5. Tool kits are also available sometimes specific to a phone. I guess it would be wise to look for the tutorial first either to determine it's availability and then it's complexity.
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"Any sufficiently advanced technology is indistinguishable from magic."
— Arthur C. Clarke