Nexus 5 motherboard repair

Hi,
 
I have a Nexus 5 that has a fault with the charging portion of it. Sometimes it will charge, most of the time it does not.
I have already replaced the battery twice, Changed out the USB dock PCB, Factory reset, Flashed a different ROM etc but the issue remains which is why I now believe it to be the main/motherboard of the device.
Can you repair the motherboard or is it pretty much toast?

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