Is there any components on the other side of the PCB? Or is the aluminium heatsink removing heat through the PCB itself? Some micro-sized heatsinks might be in order for the ASIC chip on the top side in any case...
There are no components under the heatsink.
Source: The teardown by codinginmysleep, here: http://www.youtube.com/watch?v=GPqPlLFuEX4