Disassemble lg mt2945d

SOURCE: removing the DC input from a Gateway 7322gz notebook

I tried looking up a manual on how to remove the motherboard on Gateway's support site but they do not provide one. They may have one available that is not published on the site. I would first contact their tech support via Chat and ask if they have one available for download. This would give you specific instructions on how to open the laptop and remove the motherboard so you can replace the DC jack. You will need the serial number from the laptop to open a chat session.
If they do not have one you can try it yourself. I did this myself with my HP laptop and after many tedious hours of work I was able to remove the motherboard, remove the dc jack, and resauder a new one on the board and it worked out perfectly.
If you feel comfortable doing the work yourself first start off by removing the screws on the bottom. You then should be able to remove the keyboard, look for a cable that connects it to the board. Now you should be able to remove the pieces of the case around the keyboard, look for the cable connecting the touchpad to the motherboard. After that you should be able to remove the LCD screen, look for the cable connecting it to the motherboard. Now remove the screws holding the motherboard in and remove the tiny bolts around the external monitor connector and the printer connector if you have one. Now you should have access to the DC jack. You will need to sauder the current one off the board and resauder a new one on. Keep track of the many many screws and try placing the components in the order they came out so will know which ones need to go back in in the proper order.
This is VERY tedious if you are not familiar with working on laptop hardware. You maybe able to find a local shop willing to do this or you can look online for a place that replaces DC jacks on motherboards.

Hope this helps!

SOURCE: DC input port broken.

Try Digikey.com. Part# CP-040CH-ND