Original post by: Bob Somers ,
Once copper solder pads have lifted off the substrate, there's usually no way to get them back on. Your best bet would be to '''carefully''' try to scratch off some of the solder mask on top of the traces leading to the missing pads. Once the copper traces are exposed, you should be able to either solder in a short shim wire or blob enough solder to connect the trace with the corresponding pad. If you have a multimeter, you can use its continuity tester function to check the repair and make sure your solder joints are working. Depending on how much of the solder joints are exposed, you may want to add something that will insulate them from other exposed pads to avoid a short. Work carefully, methodically, and slowly, and it should be fixable!