Very strange, it's a fairly meaty supply (40W, 12V) to supply the audio amps.

As it died when hardware was added, I would suspect it might be something to do with the changes you made (or maybe even something dropped into the PSU by mistake?). Blown PSU is not a cause a failure in any of the dead receivers I've seen (mostly, it's the LCD cable fracturing, followed by one of the figure-of-8 power pins getting pushed into the unit).

Hugo