My sister emailed today that her Samsung Galaxy S4 SGH-M919 will not charge. She sent me a part that needs replacing and a link to a video that shows how easy it is to replace the usb port. Price of the part is just $3.99
Buy the tools you need maybe another $8
Most of the samsung parts are cheap except for the screen and digitizer. She will do the repair herself.
Samsung S4 Not Charging, Not Syncing, Repair - Fix
https://www.youtube.com/watch?v=WCJcBltgE-I
ePartSolution-Samsung Galaxy S4 SGH-M919 USB port Charging Port & Microphone Mic Flex Cable Ribbon Replacement Part
http://www.amazon.com/ePartSolution-Samsung-SGH-M919-Charging-Microphone-Replacement/dp/B00EZ6EZ6U
I tried to replace my screen on my first generation Nexus 7 and I ended up cracking the new screen during the installation. Lesson learned!