I just contributed to the poll. Plug stopped working due to power supply failure after about 8 months of continuous usage. In my case, 110V system. No obviously damaged components on the PS PCB. However, measuring with a multimeter on the 5V output (main board disconnected) it is clearly observed how the 5V line is "jumping" back and forth between 0V and 5V (almost). This explains why the LEDs were blinking before I took the device apart.
It was great to find this problem covered in this user group as it saved me a lot of time to find the cause. So far I have been unable to find a circuit diagram for the PS design. In fact, I have not been able to identify the model/part number yet even though it appears to be a Haosenda International built part. Anyone that has more technical information for this particular Power Supply?