I just upgraded (if you can still call it that) my A/V receiver from an Onkyo TX-SR603 to the TX-SR674 b/c of the HDMI upconversion capability. My TX-SR603 worked FINE...
I hooked up my Dish Network HD DVR and Philips DVD player to the Onkyo component inputs and my Infocus IN72 projector to the Onkyo component output. I'm using a 25' length of component coupled to another 10' length to give the 35' total I needed. I watched a few scenes of "Flyboys" on DVD with no problems, but when I started watching some programming from Dish, I started getting the loss of video on bright scenes.
To troubleshoot, I tried connecting the Sat box and projector directly, bypassing the Onkyo, and it worked flawlessly. So I then connected it back like I had it, but this time I removed the 10' extension of component cable. It seemed to decrease the sensitivity to bright scenes a bit, but not totally.
Next, I started playing with the Sat box resolution settings. I first set it from 1080i to 720p and played the video. Again, it helped somewhat, but not totally. Then I backed it down further to 480p and it was better, but still not perfect. I finally took it all the way down to 480i and it still didn't totally stop the video loss on bright scenes.
I sent Onkyo an email and they replied back telling me that "there could be a problem with the receiver" and that I should get it serviced at one of their Onkyo repair centers, which the closest one is in Houston (I'm in Dallas/FW).
After finding this thread, I'm sending this baby back to JR.com and either picking up an old TX-SR603 (I sold mine on Ebay
) or switching to a Denon AVR787 or AVR887 w/ HDMI. A CircuitCity.com customer review said this about the Denon:"This is the third A/V receiver I've purchased within the past 45 days. I returned two A/V receivers.....the first purchase/return was a Sony...which produced a clicking sound (like a second hand in a clock) in my speakers. The second A/V Onkyo would cause my dell projector to switch on and off with certain action movies..."
try picking up a TX-SR604 and testing it to see if it does the same thing since it's just the updated version of my old 603. I still like Onkyo, but I didn't need the HDMI this bad...