crwdns2934241:0crwdne2934241:0 mayer

crwdns2934249:0crwdne2934249:0:

I've never seen this part fail.  I would suspect a failed solder joint.  Of course if it is less than a year old, get a warranty replacement from Apple.  If not, I'd tear it down and see if I could spot the problem.  Here's the teardown:  [guide|1240]

crwdns2915684:0crwdne2915684:0:

open