Product review (4 stars): Quick and easy replacement--works like a champ
My Whirlpool side-by-side refrigerator stopped making ice (and dispensing it).  Called a repair guy to solve both--he was able to fix the dispensing problem but not the ice making issue.  Some quick google research indicates it's the optic control boards.  I verified mine were bad by checking for IR with an Ipad camera--if you point an IR source (such as the emitter in the fridge board or an average TV remote) into the Ipad camera (or may smartphone cameras), you can see the IR light.

Bought this part from Amazon--it was $20 bucks more, but between buying from Amazon and being Prime I knew they'd make it right if the part did not work.  Changed out the boards in perhaps 10 minutes.  It requires nothing more than a phillips screwdriver and a bit of patience.  IR light--check.  It harvested the ice in the tray, passed the optic test (two blinks when open, solid LED when door open and flapper shut) and I had ice in an hour.  Ice container has filled, optics stopped the ice maker as designed about a day later (mine is the tiny 5 cube maker).

The part appears to be factory legit--it comes with an instruction sheet with Whirlpool markings, and the markings match the one that came out of my fridge.  I'm told these things go frequently--my original one burned out in about 7 years.  80 bucks in parts beats a new fridge.  I'll revisit and perhaps go to 5 stars in a few months once I verify that the boards continue to work.