I bought the HT-CT550W off Newegg about a month and a half ago, set it up and all is well, we are very happy.
However, about a week ago while watching TV (Visio LCD) the screen started to switch off, not power off but just go black, for about a half a second. This only happened while watching through the SAT/CABLE input that is connected via HDMI to a Comcast digital DVR. I noticed on the display of the HT-CT550W receiver the HDMI and Dolby indicator would turn off when I lost display on the TV.
Being the troubleshooting guy that I am; I swapped HDMI(different brand even) cables, changed to the GAME HDMI receiver input, and powered down the system (unplugged from wall for 1 min), each resulting in no change with the issue.
My Xbox360 is also connected to the receiver (HDMI) and is working fine, we watched HD streamed from Netflix. When I take the HDMI from the Cable/DVR directly to the TV it's ok.
What sucks is, if I would have saved the box Newegg would have RMA'd it for me.
I suppose I'm going to have to send it in to Sony repair.
I'm still not sure it's a problem with the Sony unit, why would the Xbox work fine? Our local Comcast is pretty cool if you bring them a DVR they will give you a new one, no questions asked.
I will run a Blu-ray through it later today and post results here.