Luckily I have a micro atx power supply which is now filling in.
I imagine there will be a few people interested to read that. Was it a straight replacement or was there any rewiring involved.
Maybe so. Probably more important to us Australians who have a bit more difficulty in obtaining support. Note in Australia there is no formal support for the HD nor is their a distributor. It doesn't even have it's formal CE tick of approval yet. For those of you buying a soundbridge in Australia there is now a distributor, however they will only provide support for the ones they sell (Read: I received the distinct impression that the distributor will not support soundbridges sold by their resellers prior to them becoming a distributor). ROKU READ THIS: Your Support Needs Improving
In my case the device is under warranty however I am not sure sending the HD all the way back to the US is in my best interest.
Question for ROKU:
If I send you the dead power supply will you replace it? Please note as a customer I have no intention of paying for international shipping on the HD nor waiting the weeks it will take to get it back.
Onto the actuall powersupply replacement....
As previously pointed out on the forums the Power supply has two rails 3.3v (7A) and 5v (1A). Given that I wanted the Roku up and running today and didn't want to spend time diagnosing the current power supply (Read: I don't trust that the problem will not reoccur) I chose to use a small ATX power supply until I could find a replacement power supply that would fit the ROKU. This ment an external power supply connected to the ROKU. Note even 1U power supplies are unlikely to fit as they are approx 40mm high where as the Roku power supply is approx 30mm high.
The micro ATX power supply I chose is 200W (more than enough grunt for the job) and has a whisper quiet fan which I cannot hear even in a quiet room.
The steps I took were:
1. Install a small toggle switch on the power supply. 1 pin connected to the PS-ON cable (PIN 14 - Green Cable) and the other Pin connected to a ground cable. This enables the power supply to be turned on without a motherboard.
2. In my case I didnt want cables hanging out of the power supply so I removed the cables I didn't need. The power connector on the Roku motherboad has 5 pins (3.3v, 3.3v, GND, GND,GND, 5V). So the cables I needed to keep were: 2 x orange cables (3.3v), 3 x black cables (gnd) and 1 x 5v (red).
3. I put a new 6 pin plug connector on the ends of the remaining 6 cables.
4. Made a temporary extension lead from the power supply connector to the ROKU.
5. Tommorow I will decide which of my long term options I like best:
a. Get a new PSU from ROKu
b. Install a connector on the ROKU where the power plug used to be and leave the xisting arrangement
c. Find a replacement power supply which will fit the ROKU and install with a fan
d. Use an external 60W power pack with an internal DC to DC convertor.
I actually like the idea of the power supply being external and may at option d. Certainly the reduction in heat within the box is significant and this can only help the longevity of the ROKU.