How do do I replace the power port

Hi,

The DC In jack (supplier example only) is hard mounted onto the motherboard. There are other suppliers online that may suit you better. Just search for Acer Chromebook C740 DC-In jack to get results.

Here’s the ifixit Acer Chromebook C740 Motherboard Replacement guide.

This shows how to remove the motherboard from the laptop so that the DC-In jack can be unsoldered and a new one soldered in its place.

If doing this yourself seems too daunting, contact a reputable, professional laptop repair service and ask for a quote.