Hi. I just received my Pi today and plugged it into my Sony Bravia via the HDMI connection and booted it up (using the wheezy raspian OS). It worked just fine initially (5-10 minutes), then the screen went all noisy and flickery. I rebooted, but the problem remained. I removed the usb mouse/keyboard dongle to an externally powered usb hub, then rebooted, which left me almost back to initial conditions, except no red color was coming through. I tested the composite video port, and that works fine, all colors. I checked all cables and can see no visible reason for the problem. I then experimented with config_hdmi_boost (in /boot/config.txt), and some red starts showing up at 6, lots at 7, but it's a mess. I swapped the power supply I'm using (ordered from Allied Electronics as compatible with the Pi) with my ipad supply, with no change in the color output.
I do not have a spare HDMI cable, but will buy one and try that. I also don't have any other HDMI capable displays in the house, so I can't test that. From what I can tell, the Sony tv is ok, nothing wrong with that HDMI port.
I'm guessing it's either the HDMI connector, HDMI cable or the power supply. I will update once I get a new cable to try. Anyone have a similar experience, or suggestions for a voltage measurement I can do? I have a multimeter and can do so. Could the power supply be underperforming and causing the HDMI problem? Or, is it obviously a connector/cable issue? As I said, it initially worked perfectly.
Many thanks for any ideas on the problem.