This instructable will make your life easier for USB replacement on Galaxy S3 smart phones as well as others (may need a slightly differently-configured stencil). You will need the following:
Replacement USB stencil
Hot air or IR heating source
Isopropyl alcohol (for cleaning)
Soft-bristled cleaning brush
Some type of magnification to help align stencil and inspect solder
Step 1: Removing USB Connector
Using a hot air source (or other means such as IR) carefully remove the connector requiring replacement. Make sure to mask off outlying areas so as to prevent heat from damaging neighboring components. Use tweezers to remove. Use soldering iron, flux and solder braid to remove remnant solder on all of the pads.
Step 2: Peel Release Liner From USB Stencil. Align and Place.
Inspect the stencil to make sure that you have the correct Galaxy 3 pattern for the USB. Peel off the release liner. Align stencil over the communication pads as well as the mounting pads.
Step 3: Squeegee Solder Paste Over Apertures
Using a micro squeegee squeegee solder paste over the apertures. Go back and forth several times in order to make sure all of the apertures are filled with lead-free solder. Wipe any remnant solder paste off of the surface of the stencil.
Step 4: Place the Replacement Connector on to the PCB
Using a pair of tweezers place the USB connector leads into the matching apertures filled with solder paste. Reflow the solder paste. The stencil will stay in place to assist with alignment and to prevent the solder from shorting neighboring leads.
Step 5: Clean. Inspect Your Work. Test.
Clean off any remnant flux residue. Inspect your work. Test the port electrically for connectivity. This entire process should take no more than 10 minutes!
See more at