Proceeding with caution, we carefully remove the "AC 120/240V, 50-60Hz, auto-switchable" power supply board.

Behold, the towering metropolis that is populated by an array of capacitors and inductors.

Notice the globs of glue splattered over many of the components. The smallest rattle or vibration inside the Play:3 will cause quite the uproar (and probably a product return), so everything is firmly glued in place.