Just did this repair on my wife's MacBook a little while ago, but I only cracked the case open enough to pull put the cable and clip the wires at the strain relief. Then I soldered the new cable to those cable ends, added the shrink tubing, and re-sealed the case with superglue. It looks and works like new! Much easier than going to the board. I also held the ears in place with scotch tape so they wouldn't move while closing it up.