Since I wrote that post months ago, I have been fighting Onkyo for decent service. They have very very little to give, I assure you.
I sent the AVR in to United Radio Service of East Syracuse, NY (they are _awesome_, and the lone bright shining star in my saga) on 5/21/09. Today, 7/30/09, I have a new receiver (according to FedEx it will be delivered this afternoon). Between here and there, is a long, arduous saga, involving no fewer than 5 infuriating agents at Onkyo USA in Upper Saddle River, NJ. I have names and numbers, but I don't feel the need to call anyone out on a public forum.
I'm going to snip from a letter I sent to their CS department, post facto, because I do not want to retype it:
In May, after a month or so of hiccups and bugs in the HDMI subsystem of my Onkyo TX-SR606 receiver, I sent it in on a warranty claim for repair. It was received by United Radio Service [the contracted repair house], in East Syracuse, NY on May 22. Parts were ordered for repair on May 29. On June 12, I was informed that Onkyo did not have parts available, and that they were/are backordered until July 21. Six weeks is a long time to have any piece of equipment out for repair, so I called Onkyo to see if we could make another arrangement. I spoke with -name redacted-, in parts, who put me through a few hoops at first, but eventually relented and agreed to do a swap with a new unit because the parts for repair would be so long in coming. Their first position was to extend my manufacturer's warranty by 6 weeks (!!!!!), but I wasn't having that, as the cost of the warranty extension didn't begin to cover my time, aggravation, and opportunity cost of having no receiver for so long. On June 17, URS shipped my receiver directly to Onkyo, and once it was received there, Onkyo would send out a swap unit to me, directly.
That is where I stand today, frustrated, aggravated, and annoyed, 33 days later. Since sometime around June 22, Onkyo has been promising me weekly that a new receiver would be shipped out "next week" only for me to call on a Monday and be told that the receiver is on backorder and there was nothing available for me. Today I called again, and spoke with -name redacted- in order fulfillment, who told me just last Friday that she would ship me a new unit today. Now they are even promising an upgrade, to this year's model of TX-SR607, but this is only because the 606 has been discontinued. I called today, and -name redacted- told me next week at best. She indicated that they should be receiving new unit "the 4th week of July". I didn't tell her that that indicates this week, because I just didn't want to confuse the poor dear.
Fast forward about 10 days, and the receiver is finally in the mail. To sum up, HDMI daughterboard is fried. You will most likely have to follow the exact process I went through. Be persistent and take copious notes while on the phone. Do not necessarily expect to get a brand new unit like I did unless there is a backorder on your parts. Do expect to be frustrated and aggravated by Onkyo's horrible customer service.
Good luck to all.