I'll second what dennisae said. I've got a TX-NR708 that had all sorts of video issues after about 6 months of use until I got the HDMI board replaced. This seems to be an issue with this brand over a wide number of models.
SOURCE: I have a TX SR
This is one of many reasons I recommend against routing ANY video through a receiver if the TV/ monitor has enough connections for all of the video sources.
Bypass the receiver andsee what happens, then isolate a cause.
SOURCE: Onkyo TX SR 606 -- Connection Issues with Cable/ Dig Coax Audio
1. Video-out to TV: You should be able to connect the receiver to the TV with any / all of the available video modes.
However, if you don't have the HDMI connection, then the Video-In on the TV would have to be switched back-n-forth between Composite / S-Video, depending on how each device is connected to the receiver. [If the TV has 'auto-sensing' Video-In then it should automatically detect the incoming signal from the receiver whether S-Video or Composite or Component.]
2. Audio-Input to receiver: As the receiver provides only two Coax-Inputs, you would have to first assign Coax-1 to DVD and Coax-2 to Cable. Then connect the coax cables accordingly; that should do the trick and allow you to hear the cable sound over coax.
If you still have a problem then check the 'Input mode' setting; leaving it on Coax-1/2 (Auto) would be the better option. This is on pg. 50 of my manual "Specifying the Digital Signal Format".
SOURCE: Put component signals in to the reciver but get none signals out!
You need to turn off the Display Discovery setting on the XBOX
SOURCE: TV not receiving video signal from DVD. Component
This model has a defective hdmi pcb assy. this is a well know defect with this model.If under warrenty have hdmi bd replaced if not the hdmi pcb assy retails around $350.00
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