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[Juvenal1228]

if it was the port you would be able to see bad joints underneath it, but it most likely is not the port.

reflow your 360 again, this time focusing on the GPU and ANA/HANA chips.

also, if your 360 has a HANA and not an ANA (hana is a BGA chip like the GPU) you can try pushing it with decent force while the 360 is on, remove the fan shroud for a few seconds and push. if the color fixes itself it is the HANA.